Upwork home
Sign up
Secondary

Hire the best API Integration Freelancers in Barcelona, ES

Check out API Integration Freelancers in Barcelona, ES with the skills you need for your next job.
Hire freelancers
Clients rate API Integration professionals
Rating is 4.8 out of 5.
4.8/5
based on 102 client reviews
  • $50 hourly
    • 5.0/5
    • (18 jobs)
    ⚡ Make AI Work For You: Transforming Businesses Through Intelligent Solutions I transform complex business challenges into efficient, automated workflows that save time, cut errors, and fuel growth. With expertise in both no-code platforms and custom development, I deliver end-to-end AI solutions that keep you ahead. 🎯 Core Specialties: • Custom AI Agents Development • Conversational AI & Voice Assistant Development • Workflow Automation & Process Optimization • System Integration & API Development 🛠️ Technical Stack: • Automation: n8n, Make.com • AI Development: LangChain/LangGraph (+ Flowise, Langflow), VoiceFlow • Custom Development: Python, API Integration • Voice AI: VAPI, Bland AI 💡 My Approach: • Quick Discovery: Understanding your most pressing challenges • Rapid Prototype: Getting a working solution • Measure & Refine: Optimizing for maximum ROI • Scale & Expand: Growing capabilities as your business evolves ✅ Why Work With Me: • Deep expertise across leading platforms • Marketing Background: I understand business metrics, not just code • Practical Solutions: Focus on ROI and real business impact • Clear Communication in non-technical language Ready to revolutionize your business operations with AI? Let's discuss how I can help you achieve your automation goals.
    Featured Skill API Integration
    AI Development
    Python
    Marketing Automation
    Chatbot Flow Design
    Chatbot Development
    Airtable
    LangChain
    ChatGPT API
    AI Chatbot
    AI Agent Development
    Make.com
  • $50 hourly
    • 5.0/5
    • (11 jobs)
    I'm a senior full-stack developer (C# / Angular) with 15+ years of experience. I'm a hard worker and always stick to strict deadlines and business goals of my customers. I'm open and encourage direct and honest communication with my clients. What I enjoy the most is working on complex projects that have challenging tasks, I'm always willing to learn and try new technologies. During my career, I have worked on projects for large enterprises (Dell and Deutche Bank) as well as small startups; I've learned to be both methodological and pedantic when it comes to writing the robust code, and flexible when it comes to rapidly changing requirements and environment. I have advanced knowledge in the following technologies. - .NET (c#, asp.net core, Entity Framework, asp.net MVC WebAPI) - Multithreading, async programming - Great frontend skills - Angular 2+, React - Database development (MS SQL, PostgreSQL), PL-SQL / stored procedures - Messaging : SignalR, Rabbit MQ, Kafka - BI/Reporting (SSRS, Power BI) I look forward to learning more about your project, let's touch base and start discussing your requirements.
    Featured Skill API Integration
    .NET Core
    Angular
    Machine Learning
    React
    Microsoft Azure
    Microsoft Power BI
    ASP.NET Web API
    API Development
    ASP.NET MVC
    Azure DevOps
    TypeScript
    SQL
    C#
    Entity Framework
  • $60 hourly
    • 5.0/5
    • (8 jobs)
    👋 Hello! Are you looking for a highly skilled Full Stack Data Scientist to drive your data initiatives forward? 📈 Experience: I am an experienced professional with 4 years of hands-on experience in Data Science positions, covering the entire data pipeline from data extraction and processing to machine learning model deployment and visualization. I hold two MSc degrees in Data Science and Economics. 🛳️​High-Profile Companies: I've had the privilege to work with top-notch tech organizations, including Amazon and Glovo, where I honed my skills and contributed to cutting-edge projects. 🔧​Tools Proficiency: • Programming Languages: Python, SQL • Machine Learning: Sklearn, Pytorch • Scraping: Selenium for Scrapers • ETL Processes: DBT, Airflow-Jenkins • Data Visualization: Power BI, Looker and LookML-Tableau • Database Management / Data Modeling: Amazon Redshift, Cloud SQL, BigQuery • Version Control: Git/GitHub • Cloud Services: AWS, Google Cloud • Containerization: Docker 🎉​Specific Achievements: • Glovo: - Independently built and productionalized predictive Machine Learning models in Python to forecast orders in real time for quick-commerce (groceries). The prediction, based on an LSTM neural network served with real-time data on orders and users viewing the store page, was used to anticipate the dispatch of a courier. This initiative cut delivery time by 15% at an extra cost of only 1% per order. - Developed a highly efficient web scraping framework utilizing Docker, Jenkins, AWS, Selenium, Apache Airflow, LookML, providing crucial insights for strategic planning to the company's C-level executives. The scraper retrieves data from 15 different competitor platforms related to the Estimated Time of Arrival of orders 6 times a day for more than 30,000 stores. - Conducted rigorous A/B testing for Real-Time Operations, optimizing operational strategies across all cities where the company operates. Designed the A/B test to assess the real-time actions made by agents to tackle operational issues, such as lack of couriers, and understand their impact. Following this A/B test, the entire action plan of the department was redesigned. • Amazon: - Overhauled the entire data pipeline to enhance the dashboard functionalities for the Amazon EU Procurement department, elevating the accuracy of displayed information from 80% to 97%. This involved crafting complex SQL queries, using DBT, implementing sophisticated string matching algorithms using Python to ensure data precision, and developing Power BI dashboards. ❤️‍🔥​Passion and Motivation: I'm passionate about leveraging data to drive meaningful insights and solutions, and I'm always eager to tackle new challenges in the data analytics and data science space. 🔊​Call to Action: Feel free to contact me for data-driven solutions to your business challenges. Let's work together to turn your data into actionable insights.
    Featured Skill API Integration
    dbt
    BigQuery
    Looker Studio
    Predictive Analytics
    Google Cloud Platform
    Tableau
    LookML
    Microsoft Power BI
    Python
    SQL
    Web Scraping
    Machine Learning
    Data Science
    Data Analytics
  • $59 hourly
    • 5.0/5
    • (21 jobs)
    ASAP solutions in case that your application is broken or not working as expected : I can help you! I'm available for quick bug fixing and also for server troubleshooting and recovery. Intro : I am an expert full-stack devops developer (including Linux administration and troubleshooting) with computer engineering studies and 15 years of experience in IT and I’m also an official industrial automation technician (industrial programming, quality, sensing and automated process control). Running Bluengo too. I'm in the central Europe timezone UTC+1 and I'm specialized in building and maintaining the next things: * SaaS platforms (I can also offer white-label SaaS's solutions with no upfront costs, just pay per use) * Management platforms with clients and staff areas (public area + backoffice) * Improve and convert legacy and current applications to high performance and high availability applications. * Internet of Things (IoT) (I have an interesting hardware product for enabling the secure boot of encrypted servers) * Industrial and management processes automation. * Desktop/mobile management apps. * Websites (from WordPress to massive video streaming websites). * Digital signage (reactive playlists, multiplatform Web/Linux/Windows/Android players, piped music, unattended secure kiosks) * Crypto projects. Some technologies I know (keywords): Linux (as DevOps, I can automate operations, maintenance and monitoring of any number of servers) PHP - Symfony - Laravel GoLang Python AWS - S3 - Cloudfront - Batch - EC2 - ECS - Route 53 - VPC's - etc. HTML - JS - CSS Docker - Docker Compose NodeJS Websockets - MQTT Arduino / ESP32 firmware MYSQL MongoDB ElasticSearch InfluxDB Grafana Prometheus Memcached Redis Angular +2 ReactJs React Native Cordova Ionic Crypto and NFT (ERC20, ERC721 ) also BTC developments. Salesforce (Lightning development and Salesforce API integrations) Zoho (Zoho API integrations) Other skills: * Clean code (SOLID, KISS, YAGNI, DRY). * Automation (bash/python scripting, CI/CD, reports, handling events, repetitive tasks, etc.). * Friendly and professional dashboards for processes (instrumentation and alerts). * Improve performance of existing systems (WordPress and custom-made developments). Most successful achievement: * I've been on-call for two years and getting 0 calls regarding issues in a massive global digital signage SaaS platform designed, implemented, built and maintained by myself (uptime of 100% for two years).
    Featured Skill API Integration
    Bug Fix
    Linux
    Python
    JavaScript
    Golang
    Troubleshooting
    Laravel
    ESP32
    Arduino Firmware
    Amazon Web Services
    MongoDB
    WordPress
    PHP
    DevOps
  • $60 hourly
    • 4.8/5
    • (139 jobs)
    Hey guys, I am Alex - founder of Springs - Top-50 AI Agencies on Upwork 👋 Springs is an international company specialized in AI solutions development with over 10 years of experience. We help our clients achieve their business goals by delivering useful software, AI, and ML solutions through our cutting-edge knowledge. The Headquarters is located in Barcelona, Spain. Our services: 🔹Tech Consultancy 🔹Discovery Phase 🔹UI/UX 🔹Web development 🔹Mobile development 🔹AI/ML solutions 🔹DevOps 🔹Support and Maintenance Industries expertise: 🔸 Artificial Intelligence 🔸 Computer Vision 🔸 Education 🔸 FinTech 🔸 Logistics & Transportation 🔸 Sales & Marketing 🔸 Retail 🔸 Real Estate Why Springs? 🔷 Honesty is our priority. We believe that trust is a key point for a long-term and successful partnership. 🔷 We make a deep Discovery phase before starting any project making sure we have a full vision of what should be delivered. 🔷We use standardized security practices & requirements during the development and quality assurance phases. Our Approach: 🔸Our experts employ globally recognized best practices to thoroughly analyze the market and business objectives, providing a comprehensive perspective for each project. 🔸Our engineers leverage their profound knowledge of AI, ML, mobile, data, and cloud solutions to create cutting-edge digital products that drive business enhancements across various industries. 🔸Our delivery approach is customized to breathe life into transformative digital enhancements. We meticulously guide each project through a comprehensive application development process. 🔷Technologies we use: • Javascript • MERN, MEAN • Node, Express, Sails, Nest, Next, Nuxt • React, Redux, Babel, Vue, GatsbyJS, Angular, AngularJS • Typescript • React Native, Dart, Flutter, Swift, Kotlin, iOS, Android • Python, Django, Fast API, Pandas • Pytorch, TensorFlow, Keras, Whisper, OpenCV • Langchain, Pinecone, ChromaDB • GPT 3, GPT 3.5, GPT-4, GPT-4o, GPT-4 Omni, OpenAI, LLaMA, Gemini (Bard), T5, Roberta • DALL-E, MidJourney, Stabble Diffusion, Hugging Face • NNs, RNNs, LSTM • XGBoost, LightGBM, CatBoost • Proximal Policy Optimization (PPO), DDPG, Q-Learning • OpenAI Codex, Google AutoML, DataRobot • ROS (Robot Operating System), IBM Watson, CLIPS • Linear Regression, Decision Trees, SVM • YOLO, Faster R-CNN, Mask R-CNN • DeepSpeech, Jasper, Kaldi, XLNet, T5, ERNIE • ChatGPT integration • GraphQL • Socket.io • Amazon Connect, MWS, AWS, EC2, S3, Lambda, DynamoDB • Firebase, Google Filestore • MySql, PostgreSQL, MongoDB, MariaDB • Progressive Web Applications (PWA) • Stripe API, Paypal API, Google Maps API, Mapbox API, OpenAI API • Docker, Kubernetes Our Behance profile: behance.net/m_i_a_t_e_r_i_o Springs cares about code styling, modern standards, and the productivity of the project implementation. That is why we do constant code reviews, modifications, and automation tests to ease the app release as well as possible. At the same time, our Team Leads and CTO are always ready to mentor, help and support our talented developers. They also provide on-demand tech consultancy to our partners to find the best mobile or web app development approach for the concept. The product quality is our top priority, We always start with proper architecture planning, database structuring and other preparations for further app development and timely delivery. By the way, we do compulsory code investigations. If we work with the existing code written by other devs/teams we always check if there is a possibility to use it. We don’t just focus on the app development process but we think about the future. We support the most data-driven scopes like logistics and retail accelerating their digital transformation. So whether you need a custom mobile ERP or eCommerce web development we’re the right guys to outsource your project to. Keywords that you can use to find us: User Interface, User Experience, Design Thinking, Interaction Design, Designer, UI, UX, Web-design, Mobile Design, Mock-up, Design Expert, Design Gugu, App Design, Application design, platform design, Adobe, Photoshop, Illustrator, Graphics, Graphic Design, Visual Design, Creative, Material Design, Guidelines, Android, iOS, Desktop, iPhone, Application, Usability, Website, Logo, Logotype, Responsive, Adaptive, Website Prototyping, Wireframe, Update, Solutions, Long term, Effective, Productive, Experienced, Job, SAAS, Hire, Team Leader, Testing, A/B Testing, Sketch, Advertising, Branding, Agency, Identity, Identity, Design Thinking, Management, Art Director, Head of Design, Search, Digital, Landing, Promo, Redesign, Developing, Creation, Page, Corporate, IT, Tech, Technology.
    Featured Skill API Integration
    AI Agent Development
    Chatbot
    Chatbot Development
    Natural Language Processing
    Data Science
    API
    Web Development
    ChatGPT
    Machine Learning
    Artificial Intelligence
    Node.js
    Python
    React
    JavaScript
  • $29 hourly
    • 5.0/5
    • (4 jobs)
    I help businesses automate processes and drive growth using AI. My expertise includes n8n, Make.com, chatbot development, CRM integration/automation, AI-powered lead generation, and AI marketing strategies. My background is unique: I have worked daily within billion-dollar corporations implementing large-scale solutions, while also freelancing extensively with SMBs to deliver agile, impactful automations. This gives me a broad perspective on applying best practices effectively, regardless of company size. Focus Areas: - Workflow Automation (n8n, Make.com) - Chatbot Solutions - CRM Automation & Optimization - AI for Lead Generation & Qualification - AI-Driven Marketing Automation If you're looking for efficient, intelligent automation solutions, let's talk.
    Featured Skill API Integration
    Marketing
    AI Agent Development
    Lead Generation
    CRM Automation
    Chatbot
    ChatGPT API
    Make.com
    Zapier
    n8n
    Systems Engineering
    Artificial Intelligence
  • $60 hourly
    • 4.8/5
    • (52 jobs)
    ⚡️Top 1% on Upwork (Expert-Vetted) ⚡️ 100% Job Success Score ⚡️ Enhanced +100 companies 🌟 Accomplished Business Intelligence expert with robust expertise in data analytics and advanced data solutions. 📊 Proficient in developing engaging Power BI dashboards and excels at integrating complex data sources, including APIs, Microsoft Fabric, and Data Lakes. 🛠 Skilled in orchestrating extensive Data Analytics projects across diverse sectors such as IT, Retail, Construction, Energy, Pharmaceuticals, and E-commerce. 💻 Technically adept with DAX, Power Query, SQL, Snowflake, Databricks, Python, Spark jobs, and SaaS APIs to engineer tailored solutions for distinct project requirements. 📈 Demonstrated success in deploying data-driven strategies that bolster customer retention, revenue growth, and operational efficiencies. CLIENT CASES 🔍 Data-driven Decision Making: Advanced data analytics facilitated a pharmaceutical company in pinpointing crucial customer segments. Developed comprehensive Power BI dashboards by integrating diverse data sources such as sales, web traffic, and social media via APIs, enhancing customer retention by 20% and revenue by 15%. 📦 Streamlined Inventory Management: Directed a sophisticated data analytics initiative for a construction firm utilizing DAX, Power Query, and Snowflake coupled with data pipelines to monitor resources effectively, cutting inventory costs by 30% and boosting project delivery. 🛒 E-commerce Sales Optimization: Implemented Python scripts and leveraged SaaS APIs to dissect e-commerce sales data. Crafted dynamic pricing models that escalated online sales by 25% and improved customer satisfaction. Available to provide a detailed portfolio of reference projects upon request.
    Featured Skill API Integration
    Microsoft Power BI Development
    Analytics
    API
    KPI Metric Development
    Microsoft Power BI Data Visualization
    Microsoft SQL Server
    Data Integration
    Power Query
    Data Visualization
    Data Analysis Expressions
    Business Intelligence
    Data Analysis
    Dashboard
    Microsoft Power BI
  • $35 hourly
    • 5.0/5
    • (5 jobs)
    Developer specializing in Google Apps Script and Google Workspace APIs (Drive, Gmail, Sheets, Docs, Calendar, Admin SDK, Tasks). I'm fairly active in Stack Overflow, you can visit my profile in order to see my activity. Stack Overflow username: Iamblichus
    Featured Skill API Integration
    Google Apps Script
    Data Scraping
    Apps Script API
    Scripting
    Google Sheets
    Node.js
    JavaScript
    Python
  • $70 hourly
    • 5.0/5
    • (5 jobs)
    Driven by innovation and a passion for technology, I thrive in environments where I can leverage my 5+ years of experience in IT, software development, and design to create impactful solutions. My expertise lies in unlocking the potential of No/Low-Code platforms, like Xano, Make, Zapier, Weweb and more, to automate complex workflows. I'm not just a builder, though; I'm also a problem-solver. Beyond technical prowess, strong communication and collaboration are my superpowers. I excel at working with diverse teams, whether it's collaborating with clients to understand their needs or partnering with developers to ensure seamless integrations. This collaborative spirit also fueled my entrepreneurial journey, leading me to found a tech startup and secure pre-seed funding. Learning is my constant companion. I actively stay updated with the latest advancements in technology, ensuring my skills and solutions remain relevant and scalable. My diverse background, encompassing industrial design and software development, allows me to approach challenges from a unique perspective, adding a creative edge to my technical expertise. Whether it's tackling complex automation challenges, spearheading product development, or contributing to innovative projects, I thrive in dynamic environments where my skills and passion can make a real difference.
    Featured Skill API Integration
    Swagger
    System Automation
    Technical Project Management
    WordPress
    Tech & IT
    Chatfuel
    Google APIs
    Dialogflow API
    Automation
    Node.js
    Chatbot
    Webflow
    Low Code & RAD Software
    Make.com
    React
    JavaScript
    Python
  • $50 hourly
    • 4.9/5
    • (2 jobs)
    Most people believe AI is the solution to any problem. Sorry to tell you—but it’s not. Plugging ChatGPT into your process is easy; creating a low-code automation or deploying an AI chatbot on your website is not rocket science. I’d be happy to take your money just to do that, but it wouldn’t help you, and I could not sleep well at night. If you’re here, you already have in mind a solution to a problem: “I need X to solve Y.” My job is to dive deep enough to find out what the real problem is—specifically, your business’s most important problem right now. Only then, if I’m the best person to solve that problem for you, I’d love to help. Examples of solutions I can develop for you: ↳ Leveraging AI and automation to enhance the quantity and quality of your sales team’s results. ↳ Using AI chatbots to ensure you never miss a client opportunity, especially when timing is key. ↳ Building reliable custom automations for your internal processes, integrating Generative AI only where it’s valuable. Who am I? I am an engineer with five years of experience building process automations as part of my full-time job. I’ve developed a strong business and product mindset, which means I’ll prioritize both your needs and your final clients’ needs to make sure it all makes business sense. For the past year, I’ve helped various small and medium-sized businesses as a freelancer, delivering sales and CRM AI automations and AI chatbots. My core expertise: ↳ Lead qualification and CRM integrations, specializing in Clay, Clearbit, and HubSpot. ↳ Streamlining internal admin processes with Google and Microsoft integrations. ↳ Low-code automation using Make.com and Zapier. ↳ AI chatbots using Botpress and ManyChat. ↳ Integrating custom AI assistants. ↳ Custom Python scripts. What you can expect by working with me: → My full dedication to making you succeed. → Attention to technical details while focusing on achieving business results. → I have availability to work with just a few clients, so you won’t be a number to me—it’ll be a white-glove service from start to finish. If this sounds interesting to you, send me a direct message, and let’s talk.
    Featured Skill API Integration
    Zapier
    ChatGPT API
    Marketing Automation
    Web Application
    AI Agent Development
    AI Chatbot
    CRM Automation
    Customer Relationship Management
    Lead Generation
    Automation
    Python
    Make.com
    JavaScript
    API
  • $40 hourly
    • 4.9/5
    • (52 jobs)
    Hey guys, great to see you browsing through my profile ! I specialize in full-cycle Shopify development, offering a complete range of services—from initial analysis and design to development, testing, and marketing. Whether you're building a store from the ground up or enhancing an existing business, I provide the expertise to optimize and elevate the Shopify experience. 🚀 THE MOTIVATION IS YOUR SUCCESS! 🚀 ◦ Shopify Development: Shopify & Shopify Plus: Crafting tailored solutions to maximize the potential of a Shopify store. Shopify App Development: Developing custom applications to extend and enhance Shopify functionality. Technical Proficiency: ◦ Backend Development: Languages & Frameworks: Proficient in PHP, Laravel, Python, Django, and NodeJS, ensuring solid and reliable backend systems. ◦ Frontend Development: Skilled in React Native, React, Redux, Vue, Vuex, JavaScript, TypeScript, HTML, and CSS/SCSS for responsive and dynamic user interfaces. ◦ Databases & Cloud Services: Expertise in MySQL, PostgreSQL, MariaDB, MongoDB, and AWS for secure and efficient data management. ◦ Design & UX/UI: Tools & Techniques: Mastery in Figma, Adobe XD, Sketch, Adobe Photoshop, Adobe Illustrator, and InVision to create visually appealing and user-centric designs. Committed to delivering not just solutions, but comprehensive packages of ongoing success and support. Ready to elevate the Shopify experience? Whether starting out or refining an established business, schedule a call today to discuss how to bring your vision to life and receive a tailored quote to help your Shopify store generate revenue.
    Featured Skill API Integration
    Web API
    Plugin Customization
    Plugin
    Plugin Development
    API Development
    API
    Ecommerce Plugin
    Liquid
    Web Development
    Ecommerce Website
    Shopify Apps
    Shopify Development
    Shopify Plus
    Shopify
  • $70 hourly
    • 4.8/5
    • (10 jobs)
    Full stack JavaScript and Typescript Developer with more than 10 years of experience My experiences range from building responsive sites that work well cross-browser to building scalable sites for the financial services industry. I like working on projects with a team that cares about creating beautiful and usable interfaces. I'm flexible with my working hours and i am happy to work closely with any existing freelancers you work with. Client side: - JavaScript - VueJS - Vue3 - Vuex - React - Angular - RxJs - HTML 5 - CSS - SASS - Qwik - Tailwind CSS - Bootstrap Server side: - Node.js (Express, Sails.js) - MySQL, - MongoDB, - NuxtJS - Nuxt Certification - WebSockets Other: - Mixpanel - Issue tracking: JIRA, Trello - VCS: GIT (Bitbucket, Github, Gitlab), SVN - Documentation: Github/Redmine Wiki - Notion
    Featured Skill API Integration
    Code Refactoring
    TypeScript
    Web Application
    Web Development
    SEO Performance
    Mixpanel
    React
    Node.js
    Angular
    Vue.js
    JavaScript
    Nuxt.js
    Serverless Stack
    API
  • $85 hourly
    • 0.0/5
    • (1 job)
    Software Engineer. +5 years working with Startups going from idea to product and scaling the codebase, the companies I have worked with have raised more than $10M combined. I'm an experienced full-stack developer focused on delivering quality products fast, I have worked hand-in-hand with founders to develop new features, improve product-development speed and deliver products with a pragmatic approach. When I design software I focus on maintainability and fast iterations, prioritizing modular design(even if it is a monolith). To me, a fast time to respond is better than 100 tests before seeing the feature live. Previously I was the Founding Engineer at myauthenticwallet.com where I helped the founder get from MVP to a product that landed 4 customers and $2M in funding.
    Featured Skill API Integration
    Slack
    Next.js
    React
    React Native
    TypeScript
    Electron
    Front-End Development
    Full-Stack Development
    AWS Lambda
    Django
    JavaScript
    Python
    AWS Development
    Web Design
  • $120 hourly
    • 0.0/5
    • (1 job)
    Diligent Software Engineer with 5 years of experience in a fast-paced environment. Has solid theoretical educational background in mathematics along with a proven track record of practical experience. Mostly skilled with Linux, Python, Django, FastAPI, PostgreSQL, Docker, AWS. My experience and kills: ✓Mathematics ✓Linux ✓C ✓AWS ✓PostgreSQL ✓Docker ✓Python ✓Flask ✓Django ✓Javascript ✓RESTful APIs ✓Microservices ✓ORM (object relational mapper) libraries ✓Git ✓Strong debugging skills ✓Database schemas that represent and support business processes I am open to discussion and will be glad to hear from you soon.
    Featured Skill API Integration
    Data Scraping
    JavaScript
    Python
    API
    jQuery
    Selenium
    Docker
    PostgreSQL
    RESTful API
    Flask
    Amazon Web Services
    Django
    Microservice
    C
  • $40 hourly
    • 0.0/5
    • (0 jobs)
    👋 Helping Founders Turn Ideas into Scalable Tech Products I help founders bring their vision to life by building simple, scalable, and efficient tech solutions. Whether you’re launching your first product or optimizing an existing one, I make the process smooth and understandable—without the technical overwhelm. What You Can Expect: ✔ A tech partner who aligns with your business goals ✔ Clear, jargon-free communication ✔ Fast MVP development to test and validate ideas quickly ✔ Scalable, future-proof solutions that grow with you ✔ Regular updates and full transparency ✔ Flexible engagement, from quick MVPs to long-term tech leadership Who I Work With: Industry Experts – You bring the knowledge; I handle the tech First-Time Founders – Step-by-step guidance to bring your idea to life Experienced Entrepreneurs – Fast execution with a solid technical foundation Growing Startups – Optimize and scale your platform with confidence Recent MVPs & Projects: 🚀 Healthcare Job Site – Built a HIPAA-compliant platform for job postings and automated payments in the nursing industry 🏠 Real Estate Insurance SaaS – Developed a claims management system that automates policy tracking and eligibility validation 🛒 E-commerce Platform – Created a scalable system managing thousands of products for Amazon FBA sellers 🤖 AI-Powered SaaS – Automated 60% of manual tasks for a recruitment platform 📚 Education App – Designed an AI tutor with a built-in rewards system 💼 Business Automation – Developed AI-powered workflows reducing operational costs by 40% How We’ll Work Together: 1. Planning (Up to a Week) Understand your industry and goals Define key features and success metrics Choose the best tech stack for your needs 2. Development (2-6 Weeks for MVP) Build the first version of your product Regular check-ins and feedback sessions Focus on core features for launch 3. Launch & Growth Smooth deployment and testing Gather user feedback and refine features Scale your platform as demand grows Tech & Expertise: 💡 Industries Healthcare, Real Estate, AI, SaaS, E-commerce, Automation, FinTech, EdTech 💻 Tech Stack Frontend: React, Next.js, Vite, shadcn/ui, Radix, Tailwind CSS Backend: NestJS, Node.js, tRPC, Express.js, Spring Boot Cloud & Infra: AWS, GCP, Serverless, Docker 📩 Let’s chat! Whether you need an MVP or a scalable platform, I’d love to help.
    Featured Skill API Integration
    SaaS Development
    AI App Development
    Node.js
    Web Development
    JavaScript
    TypeScript
    NestJS
    Next.js
    React
    Amazon Web Services
  • $47 hourly
    • 0.0/5
    • (0 jobs)
    Hi, I’m Kalvin - an AI Automation Engineer and founder of Autonymo 👋 I run a boutique agency that builds custom AI and automation systems to streamline operations and scale businesses. With 2+ years in AI-driven automation and a background in IT project management — including work with German Telekom — I help teams cut costs, save time, and scale efficiently. I don’t do cookie-cutter solutions. I dig into your business first — so we build something that actually drives results, not just looks good on paper. And if I’m not the right person for the job, I’ll tell you upfront. ☑️ What I’ve Done: • Onboarding Automation: Cut supervision time by 67% for a digital services firm using AI-powered task orchestration. • Meeting Master Agent: Reduced task-switching by 31% with automated meeting summaries + follow-up email generation. • Dev Workflow Boost: Slashed Jira ticket handling time by 53% through smart AI Agent automation. • Telekom Project Lead: Managed internal tooling for 200,000+ staff at German Telekom to streamline ad asset ordering & analytics. 🛠️Tools & Tech I Use: • AI/LLMs: GPT-4, custom AI agents, vector search • Automation: Make.com, Zapier, n8n, Airtable • Custom Builds: Node.js, Python, APIs • Platforms: Slack, Notion, Jira, CRMs, Internal Tools 🎯 Why Work With Me? I don’t just build “cool” bots — I create AI systems that eliminate busywork, unlock efficiency, and solve real business problems. Whether you’re buried in manual tasks, stuck in context-switch chaos, or ready to scale — I design automation that delivers measurable impact, fast. Let’s reclaim your time and turn AI into your unfair advantage.
    Featured Skill API Integration
    n8n
    Make.com
    Database Integration
    LLM Prompt Engineering
    ChatGPT API Integration
    ChatGPT
    Notion
    Agile Project Management
    IT Project Management
    SaaS
    AI Bot
    AI Consulting
    AI Agent Development
    Automation
  • $27 hourly
    • 5.0/5
    • (1 job)
    🚀 Transforming Ideas into Scalable Web Solutions 🚀 Hello! I’m a full-stack web developer with a passion for creating high-performance, scalable, and user-friendly web applications. With extensive experience in Next.js, Vue.js, Node.js, and AWS, I specialize in building everything from responsive landing pages to complex APIs and custom dashboards. My mission is to help startups, small businesses, and marketing teams achieve their goals through innovative, reliable, and efficient web solutions. 🔧 Services I Offer: 1. MVP Development for Startups 2. Landing Page Development Whether it’s for a marketing campaign or your startup’s launch, I create high-converting, responsive landing pages using Next.js/Vue.js. My focus is on driving user engagement and maximizing your ROI. 3. Custom CMS & API Development Need a content management system or custom API? I develop tailored CMS solutions with Next.js & Supabase and robust APIs with Node.js & Express that integrate seamlessly with your existing systems. 4. Dashboard Development Transform your data into actionable insights with custom dashboards built using Vue.js/React.js. I design intuitive, real-time dashboards that empower your team to make data-driven decisions. 5. Performance Optimization & Bug Fixing If your website is running into issues, I offer bug fixing and performance optimization services for Next.js/Vue.js applications, ensuring your site runs smoothly and efficiently. 6. AI and Automation Integration Leverage the power of AI and automation! I develop custom AI chatbots using the OpenAI API and design automated workflows with Zapier/Make, helping you enhance customer engagement and streamline operations. 7. SEO-Optimized Website Development Boost your online presence with SEO-optimized static websites that load quickly and rank high on search engines. Perfect for marketing campaigns that demand visibility and speed. 🌟 Why Work With Me? • Proven Expertise: I bring years of experience working with cutting-edge technologies like Next.js, Vue.js, Node.js, AWS, and more. • Startup-Friendly: I understand the challenges of launching a startup and offer flexible, scalable solutions tailored to your needs. • Results-Oriented: My focus is on delivering high-quality solutions that solve your problems, drive growth, and generate results. • Communication: I believe in transparent communication and provide regular updates to keep you informed throughout the project. I’m excited to partner with you to turn your vision into reality. Let’s build something amazing together! 🌐 Contact me today to discuss your project.
    Featured Skill API Integration
    Web Development
    Supabase
    JavaScript
    Database
    API
    Artificial Intelligence
    Vue.js
    MySQL
    Tailwind CSS
    PHP
    Node.js
    Next.js
    Angular
    React
  • $75 hourly
    • 4.8/5
    • (85 jobs)
    I have helped the US Government, Prudential Insurance, luxury resorts, and real estate firms unlock the full potential of AI to generate leads, automate sales, and drive revenue growth. As an Expert-Vetted (Top 1% on Upwork) AI strategist, with over 10 years business experience, I specialize in AI sales systems and have generated over $1M in additional revenue and 2X’d lead conversions for clients. 🚀 AI Solutions That Deliver Real Business Impact: ✔ $750K real estate deal closed via AI-driven lead qualification ✔ 2X more qualified meetings with AI appointment-setting automation ✔ Luxury resort AI concierge slashed labor costs by 40% ✔ US Government AI workflow automation reduced manual tasks by 90% I specialize in AI sales automation, custom AI workflows, and predictive analytics, ensuring seamless AI integrations that scale effortlessly. 🔹 AI-Powered Sales & Automation Solutions: ✔ Lead Generation Systems – AI-powered funnels that qualify leads with 92% accuracy ✔ Appointment Setting Automation – AI voice & chat agents booking meetings 24/7 ✔ Sales Workflow Automation – AI-driven systems cutting manual work by 50-90% 🔹 My AI Tech Stack & Specialties: ✔ AI & Machine Learning – RAG (Retrieval-Augmented Generation), NLP, Custom LLMs ✔ API & CRM Integrations – HubSpot, Salesforce, Zapier, Twilio ✔ Web & Mobile Development – React, Next.js, Node.js, Python 📩 Let’s build an AI system that works while you sleep and pays for itself in 30 days. Message me today.
    Featured Skill API Integration
    Conversational AI
    AI App Development
    GPT Chatbot
    OpenAI API
    Retrieval Augmented Generation
    AI Agent Development
    AI Chatbot
    Natural Language Processing
    LLM Prompt Engineering
    Generative AI
    AI Development
    Artificial Intelligence
    Machine Learning
    ChatGPT
  • $20 hourly
    • 0.0/5
    • (2 jobs)
    Hi! I’m Valentina, a front-end developer with a design-driven mindset and a passion for creating responsive, dynamic, and visually engaging web applications for businesses looking to elevate their online presence. With a unique background in architecture and a deep passion for UI design, I bring a creative, detail-oriented approach to front-end development, bridging the gap between design and development. I can help you with: - Building Scalable Web Apps: Developing efficient, maintainable codebases using React.js and modern tools. - UI Design Integration: Combining functionality and aesthetics to deliver user-friendly, engaging interfaces. - Performance Optimization: Writing clean, semantic code to improve speed, performance, and scalability. - API Integrations: Connecting dynamic backends to front-end solutions for seamless functionality. My skills and expertise: - Front-End Development: React.js, Next.js, JavaScript (ES6+), Redux, HTML5, CSS3, Vite - Styling & Animation: Bootstrap, TailwindCSS, Material UI (MUI), Framer Motion - Design Tools: Figma, Adobe Illustrator, Adobe Photoshop - Other Expertise: API integration, Responsive Design, UI Design Whether it’s building a project from scratch or refining an existing product, I’d love to help you turn your vision into reality!
    Featured Skill API Integration
    UX & UI Design
    UX Wireframe
    Adobe Photoshop
    Adobe Illustrator
    Figma
    React
    Bootstrap
    Responsive Design
    JavaScript
    CSS
    HTML
    Web Development
    Web Design
    Front-End Development
  • $19 hourly
    • 0.0/5
    • (0 jobs)
    I’m a Systems Analyst with expertise in optimizing databases, improving system performance, and integrating software solutions. Whether you're looking to streamline your workflows, enhance data management, or automate processes, I can help. Experienced in PostgreSQL, MS SQL Server, API design, and technical documentation Skilled in analyzing complex systems and finding efficient solutions I value clear communication and collaboration throughout the project, so let’s stay in touch.
    Featured Skill API Integration
    JSON
    XML
    Testing
    REST API
    SOAP API
    Product Requirements Document
    Agile Project Management
    Scrum
    Software Specifications
    Atlassian Confluence
    Jira
    Database Management
    Business Process Modeling
    SQL
  • $30 hourly
    • 0.0/5
    • (0 jobs)
    Senior Business Analyst equipped with 15+ years of professional experience. Specializes in solutions architecture aimed at improving business efficiency and profitability through effective business analysis, project management, requirements gathering, testing, training, and documentation.
    Featured Skill API Integration
    Integration Testing
    Inventory Management
    Shopify
    NetSuite Administration
    Solution Architecture Consultation
    Software Documentation
    Software Integration
    Testing
    Business Analysis
    Ecommerce Order Fulfillment
    Ecommerce Functionality
    ERP Software
    Project Management
  • $20 hourly
    • 0.0/5
    • (0 jobs)
    431 / 5.000 I'm a developer with over 15 years of experience developing websites, apps, and automating processes. I have extensive experience in data transformation, importing and exporting between different formats. My innate curiosity has led me to pursue personal projects ranging from Android apps, robotics projects, IoT, building my own 3D printer, laser engraver, PC and console controllers, and much more. If you have a problem or a needed. I maintain a high level of professionalism, ongoing communication throughout the project, and complete transparency.
    Featured Skill API Integration
    Python
    Docker Swarm Mode
    Docker Compose
    Docker
    PHP
    Web Application
    Web Development
    Scripting
    Script
  • $40 hourly
    • 0.0/5
    • (0 jobs)
    Hi! I’m Andrés, an automation and integration specialist with years of experience helping businesses streamline their workflows, save time, and reduce errors. I specialize in: Automating processes using Zapier, Make (Integromat), Google Apps Script Integrating WhatsApp with CRMs (HubSpot, Zoho, Kommo) Setting up ChatGPT bots that act as full sales agents, including personalized follow-ups, quotes, payment links, and more Building real-time dashboards (Google Sheets, Looker Studio) to visualize key metrics I’m detail-oriented, fast, and focused on delivering scalable solutions tailored to each client’s needs. Let’s work together to take your business automation to the next level! Fluent in English and Spanish. Conversational Portuguese.
    Featured Skill API Integration
    Google APIs
    Stripe API
    WhatsApp
    Google Apps Script
    Make.com
    AI Bot
    AI Agent Development
    Automation
    Zapier
    Data Visualization
    Chatbot Development
    ChatGPT API Integration
    CRM Development
  • $32 hourly
    • 0.0/5
    • (0 jobs)
    Hi there, I'm Daniel 👋 from Spain, and I speak English and Spanish. I specialize in creating automated systems for businesses in all industries. → I scaled my own marketing/automation agency to €12K/month. → I've helped businesses generate over €117,500/year in revenue. I also create and manage social media ad campaigns for various sectors, especially local service industries. I'm proud of myself for being a hard-working, effective, and efficient person. If you're looking for someone who can build automated systems that last, you've found the right person. —————— Detailed Version 1min-(English): Nice to meet you! I'm Daniel 👋. I've created automated systems that have helped numerous businesses scale and add hundreds of thousands of euros in annual revenue using tools like GPT-4, Make, GHL, Monday, Airtable, and many more. I’m proud to say I've built dozens of systems that are responsible for generating thousands in revenue for my clients. Some of my favorites include: →Automated Proposal Generation Systems (Create custom proposals via AI based on client forms, qualify them, and reach out via email/WhatsApp/SMS, helping generate more visits and close deals) →Complementary Systems for Facebook ADS Campaigns (Automatically create proposals, conversation API, CRM integration) →I also specialize in various CRMs and project management tools (like Monday, Notion, ClickUp, Airtable, Holded, etc.) That said, if you're looking for someone hard-working, effective, and efficient in their work, I’m your guy. Looking forward to meeting you soon! —————— Versión más detallada (Español): ¡Un placer conocerte! Soy Daniel 👋. He creado sistemas Automatizados que han permitido escalar a numerosas empresas a añadir cientos de miles de € en facturación a lo largo del año usando una variedad de herramientas como GPT-4, Make, GHL, Monday, Airtable y muchas más Me enorgullece dicir que he creado docenas de sistemas, los cuales son responsables en miles en ingresos para mis clientes. Algunos de mis favoritos incluyen: →Sistemas automáticos de generación propuestas (Crear propuetsas personalizadas por IA en base a formularios de los clientes, calificarlos y contactarles por correo electrónico/WhatssApp/SMS, ayudando a generar más visitas y cierre de las mismas), →Sistemas complementarios para Camaras de Facebook ADS (crear automáticamente propuestas, chats con el cliente en minutos todo ello en gestion con CRM y el equipo) →También me especializo en algunos CRM y herramientas de gestión de proyectos (como Monday, Notion, ClickUp, Airtable,Holded etc.) Dicho esto, si buscas a alguien trabajador, eficaz y eficiente con su trabajo soy tu persona. ¡Espero conocerte pronto!
    Featured Skill API Integration
    Task Automation
    System Automation
    Marketing Automation
    CRM Software
    CRM Automation
    ChatGPT
    HighLevel
    Airtable
    Make.com
    API
    Automated Workflow
    Automation
  • $28 hourly
    • 0.0/5
    • (0 jobs)
    PROFESSIONAL RESUME Experience of over 9 years in Salesforce and Salesforce Industries , working as Architect, Administrator and Developer . Direct participation in high impact projects, with interdisciplinary teams and in different countries of North and South America, Asia and Europe. Experience of more than 15 years in software development, acting as Architect, Developer and Project Manager for different industries like Telecommunications, Insurers and other big companies with an emphasis on relationship management with customers (CRM) and digital transformation. COMPUTER AND SYSTEMS ENGINEER
    Featured Skill API Integration
    Salesforce Lightning
    Customer Relationship Management
    SQL
    Apex
    Salesforce
    CRM Software
  • Want to browse more freelancers?
    Sign up

How hiring on Upwork works

1. Post a job

Tell us what you need. Provide as many details as possible, but don’t worry about getting it perfect.

2. Talent comes to you

Get qualified proposals within 24 hours, and meet the candidates you’re excited about. Hire as soon as you’re ready.

3. Collaborate easily

Use Upwork to chat or video call, share files, and track project progress right from the app.

4. Payment simplified

Receive invoices and make payments through Upwork. Only pay for work you authorize.

Trusted by

How do I hire a API Integration Freelancer near Barcelona, on Upwork?

You can hire a API Integration Freelancer near Barcelona, on Upwork in four simple steps:

  • Create a job post tailored to your API Integration Freelancer project scope. We’ll walk you through the process step by step.
  • Browse top API Integration Freelancer talent on Upwork and invite them to your project.
  • Once the proposals start flowing in, create a shortlist of top API Integration Freelancer profiles and interview.
  • Hire the right API Integration Freelancer for your project from Upwork, the world’s largest work marketplace.

At Upwork, we believe talent staffing should be easy.

How much does it cost to hire a API Integration Freelancer?

Rates charged by API Integration Freelancers on Upwork can vary with a number of factors including experience, location, and market conditions. See hourly rates for in-demand skills on Upwork.

Why hire a API Integration Freelancer near Barcelona, on Upwork?

As the world’s work marketplace, we connect highly-skilled freelance API Integration Freelancers and businesses and help them build trusted, long-term relationships so they can achieve more together. Let us help you build the dream API Integration Freelancer team you need to succeed.

Can I hire a API Integration Freelancer near Barcelona, within 24 hours on Upwork?

Depending on availability and the quality of your job post, it’s entirely possible to sign up for Upwork and receive API Integration Freelancer proposals within 24 hours of posting a job description.

Looking to hire for long-term or full-time assignments? See how Full-time hiring on Upwork simplifies the process.