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4.8/5
Based on 1,509 client reviews
Syed A.

Milton, Canada

$30/hr
5.0
5 jobs

Hi, I am a results-driven Full-Stack (MERN & Python) Developer with a Bachelor’s in Software Engineering and solid experience delivering scalable SaaS, AI-powered, and automation-driven platforms. I’ve led backend architecture, API integrations, and performance optimization for startups and enterprise-grade applications handling thousands of concurrent users. Over the past few years, I’ve worked with teams across healthcare, education, and AI to build production-ready, secure systems from backend infrastructure to full-scale integrations with tools like Twilio, OpenAI, and Stripe. I focus on writing clean, modular, and maintainable code that scales efficiently. What I Do Best • Full-Stack Development: Python, JavaScript, and TypeScript • Backend Development: Python (FastAPI, Flask, Django), Node.js (Express) • API Design & Integrations: REST, Webhooks, Third-party services (CRM, Twilio, OpenAI) • Databases: PostgreSQL, MySQL, Firebase, Supabase • DevOps: GitHub Actions CI/CD, AWS, Docker, performance optimization • Automation: Workflow automation (n8n, ERPNext scripting) • AI/ML Projects: Model integration, Flask-based deployment, and ML pipelines Key Projects ‣ AI Communication Platform: Architected Python backend for 10K+ concurrent users with <150ms latency using FastAPI and PostgreSQL. ‣ ERP Automation System: Customized ERPNext workflows, built client/server scripts, and automated HR, accounting, and sales pipelines with API-based workflows. ‣ SaaS Infrastructure (BeWhoop): Led backend development for 100K+ users with modular Node.js APIs, JWT-based authentication, and optimized database queries for 35% faster responses. ‣ AI & ML Projects: Built Flask-based web apps for X-ray classification and fake news detection using TensorFlow and NLP models. Tech Stack - Languages: Python, JavaScript - Frameworks: Django, Flask, FastAPI, React, Node.js - Databases: PostgreSQL, SQLite, MySQL, Firebase - Cloud & Tools: AWS, DigitalOcean, GitHub Actions, Docker - Development Practices: TDD, CI/CD, Documentation, Agile Collaboration Why Clients Work With Me ⁃ Proven record of scaling backend systems and reducing latency. ⁃ Solid understanding of API design, security, and compliance. ⁃ Strong communication, I translate complex technical requirements into clear deliverables. ⁃ I actively use AI tools to speed up development without compromising quality. Let’s discuss your project! Whether it’s building a web-app, backend API, integrating AI automation, or launching MVP, I can help you design, build, and scale it efficiently.

  • JavaScript
  • Node.js
  • React
  • Artificial Intelligence
  • Machine Learning
  • Machine Learning Model
  • MERN Stack
  • Python
  • LangChain
  • Amazon Web Services
  • PostgreSQL
  • MySQL
  • Firebase
  • Laravel
  • TypeScript
Nayab K.

Thorold, Canada

$40/hr
4.9
25 jobs

I help founders and businesses build 𝐒𝐚𝐚𝐒 𝐩𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬, 𝐡𝐞𝐚𝐝𝐥𝐞𝐬𝐬 𝐂𝐌𝐒 𝐬𝐲𝐬𝐭𝐞𝐦𝐬, 𝐚𝐧𝐝 𝐀𝐈-𝐩𝐨𝐰𝐞𝐫𝐞𝐝 𝐰𝐞𝐛/𝐦𝐨𝐛𝐢𝐥𝐞 𝐚𝐩𝐩𝐬, from frontend architecture to backend systems and integrations. 🚫 𝗜 𝗱𝗼𝗻’𝘁 𝘀𝗲𝗹𝗹 𝗵𝗼𝘂𝗿𝘀. 𝗜 𝗯𝘂𝗶𝗹𝗱 𝗽𝗿𝗼𝗱𝘂𝗰𝘁𝘀 𝘁𝗵𝗮𝘁 𝘀𝗰𝗮𝗹𝗲. 🤝 My promise: If expectations aren't met, I take full responsibility and make it right. Backed by 9,700+ hours and a Top Rated Plus track record on Upwork. 𝐏𝐫𝐨𝐣𝐞𝐜𝐭𝐬 𝐈’𝐯𝐞 𝐰𝐨𝐫𝐤𝐞𝐝 𝐨𝐧 𝐢𝐧𝐜𝐥𝐮𝐝𝐞: ➔ SaaS dashboards and product platforms ➔ AI agents & LLM-powered features (chatbots, RAG, workflow automation) ➔ Headless CMS-driven enterprise websites (Storyblok, Sanity) ➔ Healthcare & MedTech applications ➔ E-commerce and marketplace systems ➔ Subscription billing & Stripe integrations ➔ Fitness and mobile/web applications Across these, I've shipped 30+ production applications serving real users at scale handling complex user flows, large-scale content, and performance-critical workloads. 𝙒𝙝𝙖𝙩 𝙔𝙤𝙪 𝘾𝙖𝙣 𝙀𝙭𝙥𝙚𝙘𝙩: ➔ Scalable frontend architecture ➔ High-performance React / Next.js applications ➔ AI integration (LLMs, AI agents, RAG pipelines) ➔ Robust backend systems (Node.js, Python, Django, .NET Core) ➔ Flexible CMS-driven systems ➔ Clean and maintainable APIs ➔ Secure, scalable databases & cloud infrastructure (AWS, Docker, CI/CD) ➔ Pixel-perfect UI with strong UX focus ➔ Fast iteration with production-ready quality ➔ End-to-end ownership ➔ Built to scale from day one 𝐓𝐞𝐜𝐡 𝐒𝐭𝐚𝐜𝐤: React • Next.js • TypeScript • Redux • React Native Node.js • Python • Django • .NET Core LLMs • OpenAI / Anthropic APIs LangChain • RAG • Vector DBs Storyblok • Sanity • Headless CMS Stripe • REST APIs • Firebase MongoDB • MySQL • SQL AWS • Docker • CI/CD 📩 Products grow. Architecture decides if they scale. Let’s build it right. #FullStackDeveloper #ReactJS #NextJS #AIAgents #LLM #AIIntegration #SaaSDevelopment #HeadlessCMS #Storyblok #SanityCMS #ProductEngineering #ScalableSystems #StripeIntegration #TypeScript

  • JavaScript
  • Node.js
  • React
  • TypeScript
  • Next.js
  • AI Agent Development
  • Database Management System
  • Retrieval Augmented Generation
  • AI Development
  • RESTful API
  • Generative AI
  • Python
  • LangChain
  • Full-Stack Development
  • AI Chatbot
  • SaaS Development
  • CMS Development
  • Stripe
  • FinTech
  • API Integration
Gurmaj S.

Saskatoon, Canada

$89/hr
4.3
66 jobs

Coding is bae! and I love my bae more than anything. I have completed Master of Computer Applications and I'm a senior Full Stack Developer with extensive experience in building high quality products. I have 12+ years of experience. My experiences range building different applications. I'm a professional developer to provide a seamless experience to my clients. It's important to me to build long term relationships with clients, so I'm primarily looking for long term projects. Let's assess your project: 1. Do you have a project scope written down? with detailed deliverables? user stories? acceptance criteria defined? That's the first thing we'll talk about: SCOPE. I need to know the goal to get you there. 2. Do you have a deadline defined? for each deliverable? and a responsible? That's second on the agenda. 3. Do you have regular status meetings? PM tools? communication tools? organized folders? That's 3rd: I'll create structure and build habits. Let's get it done! I'm flexible with my working hours and am happy to work closely with any existing freelancers you work with.

  • JavaScript
  • Node.js
  • React
  • Web Design
  • SCSS
  • TypeScript
  • CSS
  • Flutter
  • Laravel
  • Bootstrap
  • Next.js
  • Tailwind CSS
  • HTML5
  • Socket.io
  • User Interface Design
Adil W.

Mississauga, Canada

$50/hr
5.0
29 jobs

𝗝𝗮𝘃𝗮 𝗕𝗮𝗰𝗸𝗲𝗻𝗱 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 🖥️, 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁 🌱, 𝗠𝗶𝗰𝗿𝗼𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀 🛠️, 𝗔𝗪𝗦 ☁️, 𝗥𝗘𝗦𝗧 𝗔𝗣𝗜𝘀 🔗 I help businesses build scalable, secure, and high performance backend systems that handle growth without slowing down. Most applications work well in the beginning. The problems start when traffic increases. APIs become slow, deployments become risky, and maintaining the code becomes expensive. That's where I come in. 𝗔𝘀 𝗮 𝗦𝗲𝗻𝗶𝗼𝗿 𝗝𝗮𝘃𝗮 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿 𝘄𝗶𝘁𝗵 𝟭𝟯+ 𝘆𝗲𝗮𝗿𝘀 𝗼𝗳 𝗲𝘅𝗽𝗲𝗿𝗶𝗲𝗻𝗰𝗲, I've helped startups and enterprise companies design, build, and optimize backend systems that scale reliably in production. I am not just a Java Developer who writes code. I help businesses create backend architectures that support growth, improve performance, and reduce technical debt. 𝗥𝗲𝘀𝘂𝗹𝘁𝘀 𝗜'𝘃𝗲 𝗗𝗲𝗹𝗶𝘃𝗲𝗿𝗲𝗱 • Built scalable Java Developer solutions serving thousands of daily users with high availability. • Designed Microservices architectures that reduced deployment risks and improved system reliability. • Developed Spring Boot applications that improved API response times and backend performance. • Helped businesses migrate legacy systems into modern Java Developer architectures. • Delivered production ready backend platforms for startups and enterprise organizations. Every project starts with a business goal and ends with measurable results. 𝗪𝗵𝗮𝘁 𝗜 𝗗𝗼 𝗝𝗮𝘃𝗮 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • Custom backend application development • Enterprise Java solutions • Legacy application modernization • Backend performance optimization • Secure and maintainable architecture 𝗦𝗽𝗿𝗶𝗻𝗴 𝗕𝗼𝗼𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • REST API development • Spring Security • Spring Data JPA • Authentication and authorization • Scalable backend services 𝗠𝗶𝗰𝗿𝗼𝘀𝗲𝗿𝘃𝗶𝗰𝗲𝘀 𝗔𝗿𝗰𝗵𝗶𝘁𝗲𝗰𝘁𝘂𝗿𝗲 • Distributed systems design • Service decomposition • API Gateway implementation • Event driven architecture • System scalability and resilience 𝗔𝗪𝗦 𝗖𝗹𝗼𝘂𝗱 𝗦𝗼𝗹𝘂𝘁𝗶𝗼𝗻𝘀 • AWS deployment and infrastructure • EC2, ECS, Lambda • Cloud architecture design • Monitoring and optimization • Cost effective cloud operations 𝗥𝗘𝗦𝗧 𝗔𝗣𝗜 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗺𝗲𝗻𝘁 • API design and implementation • Third party integrations • Payment gateway integration • Documentation and testing • Secure API architecture 𝗪𝗵𝗮𝘁 𝗠𝗮𝗸𝗲𝘀 𝗠𝗲 𝗗𝗶𝗳𝗳𝗲𝗿𝗲𝗻𝘁 Most Java Developers focus only on writing code. I focus on the business impact of the software. 𝗕𝗲𝗳𝗼𝗿𝗲 𝗯𝘂𝗶𝗹𝗱𝗶𝗻𝗴 𝗮𝗻𝘆𝘁𝗵𝗶𝗻𝗴, 𝗜 𝗮𝘀𝗸: • Will this architecture still work when traffic grows? • Can future developers maintain it easily? • Is it secure? • Is it optimized for performance? • Can it scale without major rewrites? This approach helps clients avoid costly problems later. 𝗪𝗵𝗼 𝗜 𝗪𝗼𝗿𝗸 𝗕𝗲𝘀𝘁 𝗪𝗶𝘁𝗵 • Startups building new SaaS products • Businesses scaling existing applications • Companies modernizing legacy Java systems • Teams adopting Microservices architecture • Organizations migrating workloads to AWS • Businesses needing secure and scalable REST APIs 𝗧𝗲𝗰𝗵𝗻𝗼𝗹𝗼𝗴𝗶𝗲𝘀 Java, Spring Boot, Spring Security, Hibernate, JPA, Microservices, AWS, Docker, Kubernetes, REST APIs, Kafka, RabbitMQ, PostgreSQL, MySQL, MongoDB, Redis, Maven, Gradle, Git, CI/CD, Jenkins 𝗪𝗵𝘆 𝗖𝗹𝗶𝗲𝗻𝘁𝘀 𝗛𝗶𝗿𝗲 𝗠𝗲 • 13+ years of Java Developer experience • Clean, maintainable code • Scalable backend architecture • Strong communication • Reliable delivery • Long term technical thinking If you're looking for a Java Developer who understands both software engineering and business objectives, let's discuss your project. Send an invitation and I'll respond within a few hours. Keywords: Java Developer, Senior Java Developer, Java Backend Developer, Java Software Engineer, Spring Boot Developer, Spring Boot Expert, Java Application Development, Enterprise Java Developer, Java Web Services, REST API Developer, RESTful API Development, Backend Developer, Backend Engineer, Microservices Developer, Microservices Architecture, Distributed Systems, AWS Developer, AWS Cloud Engineer, Java AWS Developer, Docker, Kubernetes, Kafka, RabbitMQ, Hibernate, JPA, Spring Security, API Integration, Database Design, PostgreSQL, MySQL, MongoDB, Redis, SaaS Backend Development, Scalable Application Development, Cloud Native Applications, Java Consultant, Software Architecture, System Design, Enterprise Application Development, Performance Optimization, CI/CD, Jenkins, Maven, Gradle, Full Stack Java Developer.

  • jQuery
  • Java
  • Spring Boot
  • Core Java
  • Java Servlet API
  • Java Collections Framework
  • JUnit
  • API
  • Microservice
  • Java Persistence API
  • Spring MVC
  • Spring Cloud
  • Spring Batch
  • jMock
  • Git
Salman C.

Toronto, Canada

$50/hr
5.0
42 jobs

I help founders launch and scale their MVPs fast with powerful low-code and no-code tech stacks. Over the last 5+ years, I've helped 15+ companies scale to 100,000+ users as a tech partner / developer. Previously, I’ve also been the founder of a startup that I personally scaled to 400,000+ users – I know what separates a winning product from a failed one. I am now partnering with select founders to turn ambitious ideas into real businesses. If you can focus on the vision, I can take care of the entire execution. 𝐓𝐡𝐞 𝐄𝐱𝐩𝐞𝐫𝐢𝐞𝐧𝐜𝐞 𝐀𝐡𝐞𝐚𝐝 I've built end to end systems for a large variety of app types: SaaS, marketplaces, CRMs, AI products, automation tools, and customer facing applications. I handle planning, development, integrations, and launch so you can stay focused on customers and business. Previously, I have built platforms like the one listed below: 🔹 AI voice and agent workflows using ElevenLabs, Vapi, Retell AI, HuggingFace 🔹 SaaS and marketplace platforms with subscriptions, billing, user roles, and access control 🔹 CRM and fintech tools with permissions, data flows, and reporting 🔹 AI and GPT features using OpenAI, Gemini, and LLM based workflows 🔹 Landing pages using Webflow and Framer for product launches and signups 🔹 Full stack builds using Bubble, Xano, Supabase, and FlutterFlow 🔹 Automation using n8n, Make, and Zapier 🔹 Responsive layouts and clean user journeys 🔹 Integrations with Stripe, SendGrid, Twilio, WhatsApp, Instagram, LinkedIn, Gmail, Calendar APIs, and hundreds more 𝐏𝐫𝐨𝐜𝐞𝐬𝐬 𝐈 𝐅𝐨𝐥𝐥𝐨𝐰 Strategy → Define scope, roadmap, and technical plan Design → Map user journeys, wireframes, and UI/UX flows Development → Build frontend, backend, and automation workflows QA → Test features, performance, and edge cases Launch → Deploy, hand over, and train your team Support → Maintain, improve, and scale post launch 𝐓𝐨𝐨𝐥𝐬 & 𝐏𝐥𝐚𝐭𝐟𝐨𝐫𝐦𝐬: 🔹 Web Apps: Bubble, Lovable, Framer, Webflow 🔹 AI & Agentic Systems: n8n, OpenAI API, Gemini, Custom GPTs, ElevenLabs, Vapi, Retell 🔹 Backend & Databases: Xano, Supabase, AWS, Bubble 🔹 Custom Code: Java, Python (as needed) 🔹 Prototyping: Lovable, Replit, Bolt 🔹 Mobile Apps: FlutterFlow, Bubble, Lovable 🔹 Automation: n8n, Make, Zapier 🔹 API Integrations: Stripe, SendGrid, Twilio, WhatsApp, Instagram, LinkedIn, Gmail, Calendar APIs, and hundreds more 𝐖𝐡𝐚𝐭 𝐘𝐨𝐮 𝐂𝐚𝐧 𝐄𝐱𝐩𝐞𝐜𝐭 Clarity → Transparent scope, timelines, and pricing before we begin Execution → Full build from strategy to design, development, QA, and launch Communication → Regular updates via email, Slack, video walk throughs, or quick calls Partnership → Founder level guidance focused on long term growth, not short term fixes Most MVPs are completed in 4–8 weeks, usually within the USD $7,500–$15,000 range depending on complexity. If you'd like to explore your idea, I’m available 7 days a week across all US time zones. Just send a message — let’s talk soon!

  • Full-Stack Development
  • AI Agent Development
  • Web Application
  • Web Development
  • Mobile App Development
  • API
  • API Integration
  • Python
  • Supabase
  • Bubble.io
  • Minimum Viable Product
  • SaaS Development
  • SaaS
  • Low-Code Development
  • No-Code Development
Sofia S.

Toronto, Canada

$50/hr
5.0
13 jobs

• A proficient Senior Full Stack Developer/Application Architect with more than 14 years of experience in Information Technology on a variety of technologies. • Experience Architecting, Designing and delivering Proof Of Concepts for Technical Integrations on both frontend and backend of web applications. • Azure certified Devops Expert with extensive handson with Azure CI/CD pipelines, ADF , Function App and many other azure services.Experience with AWS EC2 and Mapped knowledge on GCP • Coder with Architecture Interest by acquiring and asipiring to build onTOGAF Foundation Badge and courses from University of Toronto. • Excellent communication skills including verbal communication and Problem Solver. • Experience with Azure Data Factory to ingest data from one system to another.

  • Node.js
  • Azure Cosmos DB
  • Azure DevOps
  • ExpressJS
  • Docker
  • TypeScript
  • RESTful Architecture
  • Microservice
  • API Integration
  • API
  • DocuSign
  • Microsoft SharePoint
  • Fathom Applications Fathom
  • OAuth
  • User Authentication

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