Hire the best API Developers in San Francisco, CA

Check out API Developers in San Francisco, CA with the skills you need for your next job.
  • $90 hourly
    I am a developer with over 15 years of professional experience on projects including Web, Windows, and Service Applications supported by appropriate Data Stores using a range of technologies and coding languages for the Entertainment, Economic Development, Financial, and Geospatial Industries as well as smaller, multiple industry contract projects 15+ years PROFESSIONAL SKILLS: • Web, Mobile Web, Desktop Apps • Class Libraries, Windows Services • PowerShell, CLI Scripting, UNIX • Object-Oriented Programming • Client, Server, Database Scripting • Layer, Modular, n-Tier Designs • DB Admin, DB Design, Query Tuning • Stored Procedures, UDF, Geospatial • VPC, Cloud Functions, Serverless LANGUAGES/APPLICATIONS: • C#, T-SQL, HTML, CSS, Bootstrap • JavaScript, jQuery, LINQ, TypeScript • Java, PHP, Python • ASP.NET/.NET Core, AJAX, JSON • SOAP, RESTful, NodeJS, Express • Azure Functions, AWS Lambda • Visual Studio, SSMS, SSIS, IIS, SSRS • Git, SVN, Jira, TFS, NuGet, npm • Photoshop, VS Code, Docker Relevant projects will be included upon request in proposal. Based in San Francisco, California USA
    vsuc_fltilesrefresh_TrophyIcon API Development
    .NET Core
    Mapbox
    API Integration
    Looker Studio
    Looker
    Map Integration
    C#
    ASP.NET
    JavaScript
    Google APIs
    Query Tuning
    Geospatial Data
    SQL
    MVC Framework
  • $95 hourly
    I have had experience in startup and the technology software world for over 8 years. I have a lot of Workday, HRIS, and integration experience. I am very interested but not limited to in anything Workday or Data Entry roles. I spend my time coding in Python, SQL, Java, and C++. I have great API and integration experience along with the payroll/HRIS space. I have worked on countless projects to automate all different types of systems as well. I also have experience as a product manager. I have been working as a senior technical product manager for quite some time overseeing multiple teams in order to deliver the best products possible. Looking forward to hearing from you and excited to start new projects!
    vsuc_fltilesrefresh_TrophyIcon API Development
    Python
    Workday
    SQL
    API
    Presentations
    XML
    Implementation
    Google Sheets
    XSLT
    Design Thinking
    Performance Testing
    Microsoft Excel
    Microsoft Word
  • $100 hourly
    Hey! I'm originally from San Francisco, CA. I spent 7 years at Twilio, most recently serving as the Technical Lead for the IoT Usage and Billing team based out of Berlin. I have created - and improved - dozens of systems during my time at Twilio. I have experience working on backend high-scale distributed systems, leading projects from the design phase all the way to release and long term support. On the frontend I've also shipped changes to Twilio's React based console. I've spent my entire career working in teams to accomplish more than we could individually. Specific Skills - Managed servers running in AWS - Expert in Java/Scala (especially ZIO/cats, akka), Python (gevent, flask, fastapi, SQLAlchemy) - Expert in REST API design - Experience using various datastores, MySQL/Postgres, Dynamo DB, Cassandra, (+ data and schema migrations on these systems) - Experience writing data scraping scripts - Experience in NodeJS - Passionate about frontend design - Have built websites from the ground up in Typescript, React JS, Recoil, Tailwind, NextJs. - Led a team of engineers for 2 years, where I pushed for high coding standards and maintainability, and reduced team technical debt by 50% - Build out the Super SIM product at twilio from MVP all the way to 1M+ SIMs - 7 years experience in shipping changes to production code with no downtime. In my free time I enjoy working on personal programming projects, reading blogs, playing basketball, going skiing, and traveling. I recently just wrapped up a trip through Thailand and Vietnam :). I'm looking to do freelance work to have more flexibility in the work I take and the hours I work.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Apache Kafka
    Asynchronous I/O
    BigQuery
    CI/CD
    HAProxy
    Functional Programming
    Docker
    Scala
    Amazon DynamoDB
    Java
    Git
    Amazon Web Services
    MySQL
    Python
  • $50 hourly
    - Master's Computer Science from Northeastern University - 3 years' experience in developing full-stack applications. - Coding Languages: Python, JavaScript, Java, C - Other Language/tool: HTML, CSS, R, TailwindCSS, Bootstraps, Jira, Docker - Framework: Flask, React, Node, Express, AWS DynamoDB, MongoDB, MySQL, AWS Chalice - Native fluency in English and Chinese - 1 year Start-up experience: - Set up CI/CD pipelines with AWS Code Pipeline - Developed serverless applications with AWS Lambda and API Gateway using the AWS Chalice framework, - Configured domain servers with AWS Route 53.
    vsuc_fltilesrefresh_TrophyIcon API Development
    User Interface Design
    REST API
    Figma
    Jira
    AWS Lambda
    Java
    Flask
    Git
    CSS
    HTML
    TypeScript
    JavaScript
    React
    Python
  • $130 hourly
    Using Bubble.io to create your startup or MVP? I did for my startup. It's a good choice for most projects. It's a wonderful tool that also comes with a challenging learning curve, especially for those new to web development. If you're looking to move quicker than you can learn, I can help take you to the next step through regular development, integrating (or writing) plugins, working with APIs or writing custom javascript for your specific needs. I know that good documentation is paramount to growing your site and development so I'm dedicated to making sure you understand now and six months from now. I was a full-time professor for almost 8 years, so I can teach and do at the same time. I am currently teaching bubble bootcamps for bubble.io official, so catch me there as well. I believe that success is a mindset that drives you through all problems. I've been developing and managing web projects since 2004 and hope to help you get started while avoiding all the tiny roadblocks. Let me know how I can help. Please do not contact me unless you can meet my rate. It will save us both time. Thanks!
    vsuc_fltilesrefresh_TrophyIcon API Development
    Custom Content Management System
    JavaScript
  • $95 hourly
    Hi, ⭐️⭐️⭐️⭐️⭐️ TOP-RATED ELITE Salesforce Freelancer on UpWork and I live in San Francisco. I am a Salesforce 20 X certified with 14+ years of experience, with Expertise with Salesforce Sales Cloud, Service Cloud, CPQ, NPSP, Tableau expert, Pardot, Lightning, Marketing Cloud and triggers, vf pages, apex, workflows, API integrations, Salesforce commerce cloud, community cloud, health cloud. #salesforce #salesforcedeveloper #salesforceadmin #salesforce consultant #salesforcearchitect #marketingcloud #pardot #cpq #lightning #lwc Having the below-mentioned certifications: ✅Salesforce CPQ Certified Expert ✅Salesforce Certified Service Cloud Consultant ✅Salesforce Certified Platform App Builder ✅Salesforce Certified Platform Developer I ✅Salesforce Certified Sales Cloud Consultant ✅Salesforce Certified Advanced Administrator ✅Salesforce Certified Administrator Background in the form of bullet points: - Salesforce Sales Cloud - Service Cloud - Salesforce Commerce Cloud - Community Cloud - Health cloud - CPQ - NPSP - Tableau - Pardot - Lightning - Marketing Cloud - Apttus - CPQ … and additionally, I’m well versed in working with triggers, vf pages, apex, workflows and API integrations. I believe that effective communication and transparency through an Agile process like Scrum will lead to more successful projects. Please contact me with your Salesforce projects so we can get to work on finding the solutions that you need! ! Why should you work with me? I guarantee: ➤ I use Salesforce best practices while implementation. ➤ Quick responsive & updated with Salesforce latest releases. ➤ Cost-effective & bring quality as well as value for my clients. ➤ Consider deadlines very important and submit the project within the deadline. Opportunities in the 10-30% bracket are considered "Downside" opportunities in a monthly sales report and those falling within the 40%-90% bracket are "Upside" opportunities. I can customize your Salesforce.com so that you'll have all of this information in both a quantifiable reporting format as well as shown graphically (pie charts, bar charts, heat graphs, etc.). I can also create several workflows on the back-end of your Salesforce.com platform to ensure that your data/processes/resources etc. are showing you exactly what you need to quickly keep current on all things sales, marketing, CRM and business development related. In sum, I'm here to make your life easy! I'm handling all kinds of salesforce projects. So if what I've outlined above is what you're looking for then feel free to reach out and we can set up a discovery call! Thanks for reading. All the best, Thanks Teo
    vsuc_fltilesrefresh_TrophyIcon API Development
    Bug Fix
    Salesforce Marketing Cloud
    Data Migration
    CPQ Apttus
    Commerce Cloud
    Salesforce App Development
    Salesforce Service Cloud
    Salesforce Lightning
    Apex
    Salesforce Sales Cloud
    Salesforce Wave Analytics
    Salesforce CRM
  • $60 hourly
    Helping clients run meaningful production loads. Will do my best job to ensure production services are built for scale and with observability in mind.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Progress Chef
    Bash Programming
    Linux System Administration
    Terraform
    AWS Fargate
    Distributed Computing
    AWS Lambda
    NGINX
    Python
  • $250 hourly
    I am a seasoned leader with 25 years+ of experience in product and engineering. I have a strong track record of leading teams in delivering high-quality products starting from vision to delivery. I continually engage deeply with customers to understand their needs and drive those back into products they will love. I have been fortunate to build some great teams and products at Microsoft, Splunk, Auth0, DocuSign, and Uplevel. Both inside and outside of work I am passionate to help move the ball forward for diversity and inclusion, with a particular focus on bringing more diversity to Product. I mentor and advocate focusing on women and people of color. I am a lifelong learner and a graduate of Seattle University's Leadership Executive MBA program.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Splunk
    Azure DevOps
    Tableau
    AWS Lambda
    Microsoft Azure
    Cloud Computing
    Microsoft Power BI
    NoSQL Database
    Microsoft Visual Studio
    Atlassian Confluence
    Product Roadmap
    Product Strategy
    Jira
    Product Management
  • $75 hourly
    My expertise in JavaScript (ES5 and ES6), React, HTML5, CSS3, Node.js, Express, MongoDB, MySQL, PosgreSQL, RESTful API Development, and JavaScript Testing/Deployment has allowed me to successfully build and deploy multiple applications. These include the Climate Change and Property Analysis single-page website deployed on AWS EC2 and RDS using third party API, an NFT collection of original art generated by code using layers of images to recreate hundreds of unique NFTs, a full-stack e-commerce app for buying and selling toys, and a full-stack e-commerce app for clothing retail. In all of these projects, I have shown my ability to architect, improve the user experience and deploy multi level structured websites to AWS.
    vsuc_fltilesrefresh_TrophyIcon API Development
    API
    Amazon EC2
    Amazon Web Services
    PostgreSQL
    JavaScript
    CSS 3
    Git
    ExpressJS
    Node.js
    MongoDB
    MySQL
    React
  • $75 hourly
    I am a backend developer experienced in building small applications and being part of larger, enterprise teams designing and writing API routes using Typescript and Nest.js. I also have a background in education with a multiple subject teaching credential.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Database Management System
    AWS Lambda
    Database Management
    API
    RESTful Architecture
    RESTful API
    Database
  • $35 hourly
    I'm a machine learning engineer specializing in integration of AI systems into products and building products around AI systems. I also can deploy websites and infrastructure on AWS, Coreweave, Cloudflare, Runpod, or any other cloud service provider. * Can integrate ChatGPT, Chatbots, AI assistants, Image Generation (Stable Diffusion, LoRa, Controlnet), Text to Speech, Speech Recognition, Image Classification, Text Classification, or any other types of AI, into your existing services, or help you build new services around AI * Can set up and deploy your product on AWS, Coreweave, Runpod, or any other cloud service provider.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Cloudflare
    Docker
    Kubernetes
    Amazon Web Services
    Unity
    C#
    Rust
    Python
    Artificial Intelligence
    API
    Machine Learning Model
    Machine Learning
  • $50 hourly
    As a Senior Product Manager at Visa, I lead the development and launch of innovative solutions for open banking and fintech in the US market. I have over seven years of experience in product management, working with leading companies such as Plaid and Quovo. My core competencies include connectivity, integration, investments, and user retention. I am passionate about creating products that empower consumers and businesses to access and manage their financial data securely and conveniently. I am always looking for new challenges and opportunities to learn and grow in the fast-paced and dynamic fintech industry.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Business Management
    API
    Product Management
  • $66 hourly
    Data Scientist with over 3 years of experience specializing in leveraging analytical techniques across diverse industries including healthcare, insurance, and technology. Proficient in translating complex datasets into actionable insights and strategic recommendations. Recognized for advanced skills in statistical modeling, data visualization, and effective communication of analytical findings to stakeholders. Passionate about driving business decisions through data-driven methodologies and innovative problem-solving.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Statistical Analysis
    Google Cloud Platform
    Amazon Web Services
    MongoDB
    FastAPI
    Data Science
    Machine Learning
    Data Analysis
    Microsoft Power BI
    Tableau
    Marketing
    A/B Testing
    SQL
    Python
  • $38 hourly
    Are you looking for a top rated software engineer? I'm Cristoval, a seasoned fullstack software engineer and certified Stripe professional developer. My reviews from satisfied clients highlighting my dedication and expertise speak my commitment to help businesses thrive in the world. I can't help everyone but we may be a fit if:🔥 ✨You are struggling to find a quality engineer or developer who communicates every step of the way ✨ Need to integrate payment system seamlessly into your application ✨ Worried about payment PCI compliance, security vulnerabilities or scalability issues Why me? As a full-stack engineer, I bring experience to the table, specializing in software architecture, payment systems, security, and scalability. My certification as a Stripe professional developer and architect proves my deep understanding of the platform, allowing me to customize solutions that meet your specific needs. Whether you're a startup looking to establish application infrastructure or an industry leading enterprise seeking to optimize your existing setup, I'm here to make your journey with software a smooth one. Technology Expertise: ⚡️ HTML, CSS, JavaScript, TypeScript ⚡️ React, Next.js, Node.js, Express.js ⚡️ Website and web application authentication and authorization ⚡️ MongoDB, PostgreSQL ⚡️ Stripe integration, PayPal integrations, Serverless functions, API integration Send me your project requirements and I will get back to you as soon as possible. Hablo español.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Software Debugging
    Microservice
    GraphQL
    jQuery
    Database Architecture
    MySQL
    Database Design
    MongoDB
    React
    Node.js
    Next.js
    PayPal
    Stripe
    JavaScript
  • $30 hourly
    Full-Stack Web Developer with up-to-date skills. Extremely intuitive problem-solver and fast learner. Passionate about coding, debugging, and making things work! Also passionate about teaching, communicating, and connecting with people. TECHNICAL PROFICIENCIES React | JavaScript | MERN Stack | ES6 Express | Node | MongoDB | MySQL | CSS | HTML 5 | REST | GitHub | UX/UI | MVC | Relational Databases | Strong Communication | Problem-Solving | GraphQL | Responsive Web Design | Developer Tools | Insomnia | Creating Server-Side API | Third-Party API | Fetch | AJAX | Wireframe Creation | Git | GitHub | TDD | Jest | and more...
    vsuc_fltilesrefresh_TrophyIcon API Development
    Relational Database
    Algorithms
    Computer Science
    GraphQL
    NoSQL Database
    Web Development
    Node.js
    Tailwind CSS
    Next.js
    React
    SQL
    JavaScript
    HTML
    CSS
  • $30 hourly
    Results-driven professional with a breadth and depth of experience spearheading the inclusion of essential solutions across an organization's technical framework to actualize significant cost reductions without sacrificing quality assurance and the security of all data and information present. Meticulous and analytical, with a proven track record of synthesizing and evaluating a myriad of data to inform all strategic planning and technical recommendations provided to executive management.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Testing
    Product Development
    Quality Assurance
    C
    C++
    Software Testing
  • $18 hourly
    As a recent Computer Science graduate and software engineering bootcamp alumnus, I am enthusiastic about applying my learned skills in real-world scenarios. I am eager to gain experience and grow professionally. While I offer competitive rates, my primary focus is on delivering high-quality work. I possess a strong attention to detail and a commitment to producing robust and efficient software solutions. I am keen to bring my dedication and fresh perspective to projects that value innovative and meticulous work.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Back-End Development
    API Testing
    PostgreSQL
    Test-Driven Development
    React
    ExpressJS
    Flask
    Python
    JavaScript
  • $150 hourly
    Rocket Communications is an enterprise UX Design & Development company focused on designing and building mission-critical applications and systems for large enterprise companies and the government. Our clients choose us because we have the capacity to manage huge projects with massive levels of complexity. We're an eclectic team with backgrounds that include psychology, digital design, animation, graphic design, fine arts, industrial design, information architecture, engineering, and military. We are fearless. Our user-centered methodology guides us to understand what the operator is actually doing/trying to accomplish so that we can build the optimal system for accomplishing those objectives. • We make sure we are solving the right problem by validating user requirements (through collaboration with actual users), conducting task and workflow analysis. • We design how the user will interact with the system and how the system will support the operator–the UI reflects our understanding of user needs and the system’s ability to meet those needs. • In parallel we develop the system architecture and UI framework that can effectively render the design intent. • We then develop an intuitive and usable front end that meets the requirements. • Prototyping can happen throughout the process - as part of the design process to gather user feedback before code and as a communication tool for the developers. • Our developers can then deliver usable code for deployment (including surrounding systems ecosystem support/integration). • We can support our customers’ capture teams by providing rapid demo applications that display/communicate their proposed core technology capabilities to potential customers. • Our clients report that it is a big advantage to have their proposals/prototypes look Rocket-good.
    vsuc_fltilesrefresh_TrophyIcon API Development
    UX Wireframe
    UX Research
    UI/UX Prototyping
    UX & UI Design
    Front-End Development
    App Development
    Web Development
    Web Development Consultation
    Software Architecture
  • $40 hourly
    Dedicated software engineer with extensive experience in developing robust applications and automating processes within large-scale IT environments. Proficient in leading cross-functional teams to integrate diverse technologies and enhance system functionality, ensuring compliance with industry standards. Committed to leveraging expertise in Python, Docker, and DevOps/Backend methodologies to drive operational excellence and innovation in technology platforms.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Automation
    Docker
    CI/CD
    Linux
    Data Analysis
    Java
    C++
    Ansible
    Git
    Kubernetes
    Golang
    Python
    Back-End Development
    DevOps
  • $20 hourly
    Hi, This is Abdul Nafay. I'm Software Engineer. I certainly use to deal with three programming languages (Machine Learning) which incorporate Java, Python, and C . I've been chipping away at these dialects for 3 years as I've covered numerous GUI Projects, Versatile Applications, and Data Structure Programs, and Codes. Above is my little presentation you can put in a request identified with my work you'll doubtlessly get a magnificent outcome.
    vsuc_fltilesrefresh_TrophyIcon API Development
    Python Script
    GUI Design
    API Framework
    JavaScript
    Java
    Python
  • Want to browse more freelancers?
    Sign up

How hiring on Upwork works

1. Post a job (it’s free)

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 Developer near San Francisco, CA on Upwork?

You can hire a API Developer near San Francisco, CA on Upwork in four simple steps:

  • Create a job post tailored to your API Developer project scope. We’ll walk you through the process step by step.
  • Browse top API Developer talent on Upwork and invite them to your project.
  • Once the proposals start flowing in, create a shortlist of top API Developer profiles and interview.
  • Hire the right API Developer 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 Developer?

Rates charged by API Developers 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 Developer near San Francisco, CA on Upwork?

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

Can I hire a API Developer near San Francisco, CA 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 Developer proposals within 24 hours of posting a job description.

API Developer Hiring Resources
Learn about cost factors Hire talent