Hire the Best REST API Developers
in Canada

More than 3,000 reviews on G2
Rating is 4.5 out of 5.
4.5/5
of Upwork by G2 peer reviewers
Richard O.

Chilliwack, Canada

$35/hr
5.0
3 jobs

✨ I build AI-powered products, full-stack SaaS applications, and intelligent systems that go beyond prototypes, integrating with real workflows, scaling reliably, and delivering measurable business value. I specialize in AI chatbots, AI agents, LLM applications, RAG pipelines, and full-stack SaaS development using React, Angular, Python, Django, FastAPI, and modern cloud infrastructure. From conversational AI and knowledge systems to scalable web platforms and SaaS products, I help founders and businesses turn ideas into production-ready software. Many AI and SaaS projects stall because: → AI responses are inconsistent or unreliable → Workflows break with real users → Retrieval and context systems are slow or inaccurate → Integrations with backend systems are fragile → MVPs become difficult to scale or maintain That’s where I step in. I combine AI engineering with full-stack product development to build systems that are reliable, maintainable, and ready for real-world use. 💯 Selected Projects 🟢 TradeUI Concept: AI trading intelligence platform for market analysis and decision support. Challenges Solved: High-latency queries, hallucinations in financial workflows, and expensive token usage. Solution: Built RAG pipelines with structured market data, deterministic logic, validation layers, and caching to improve performance while controlling costs. 🟢 Plink AI Concept: AI workflow automation platform with conversational interfaces. Challenges Solved: Inconsistent AI responses, integrating AI with real tools, and scaling agent workflows. Solution: Built tool-calling AI agents using LangChain and LangGraph with structured outputs and API integrations for reliable task execution. 🟢 Ravk Concept: AI-powered knowledge management and research assistant platform. Challenges Solved: Fast retrieval, accurate answers, and structured outputs from large datasets. Solution: Developed vector database architecture with RAG pipelines, GPT and Claude agents, secure authentication, subscription systems, and multi-user dashboards. Impact: Reduced research time by 60%, improved answer accuracy, and increased team productivity. 🟢 Full-Stack SaaS & AI MVP Development Built and launched AI-powered MVPs and full-stack SaaS products from concept to production. Worked across: • Frontend development with React, Angular, and modern JavaScript frameworks • Backend systems using Python, Django, FastAPI, and Node.js • API integrations and business logic • Authentication and billing systems • AI workflow integration • Deployment and cloud infrastructure • Fast iteration and scalable architecture I also use modern rapid-development platforms like Lovable to accelerate product development, validate ideas quickly, and shorten time-to-market while maintaining engineering quality. ✡️ Tech Stack & Specialization AI & LLM Development OpenAI GPT-4/4o/5/o3, Claude, Gemini, Mistral, LangChain, LangGraph, LlamaIndex, AI agents, tool-calling systems, conversational AI, RAG pipelines, prompt engineering Full-Stack Development Python, Django, FastAPI, Node.js, React, Angular, Next.js, TypeScript, JavaScript, REST APIs, authentication systems, dashboard development, SaaS architecture Vector Databases & Retrieval Pinecone, Weaviate, Milvus, FAISS, semantic search, knowledge systems SaaS & Integrations Stripe, API integrations, workflow automation, subscription systems, business logic implementation AI Product & Rapid Development Lovable, AI-assisted development workflows, MVP validation, rapid prototyping Voice & Messaging AI Web chat, Twilio, VAPI, Ultravox DevOps & Cloud Docker, AWS, GCP, CI/CD pipelines ⚡ How I Work I partner with founders and teams to: ✅ Build AI chatbots and AI agents that work reliably ✅ Develop LLM-powered products and knowledge systems ✅ Build scalable full-stack SaaS applications ✅ Integrate AI with real business workflows and APIs ✅ Optimize speed, cost, and reliability ✅ Deliver maintainable and production-ready systems Clear communication, predictable delivery, and thoughtful technical decisions are central to how I work. If that sounds like what you need, 📩 Invite or DM me to discuss your project. 🔑 Keywords / Search Tags AI full-stack developer, AI engineer, React developer, Angular developer, Python developer, Django developer, FastAPI developer, AI chatbots, AI agents, LLM apps, conversational AI, RAG pipelines, OpenAI, GPT-4, GPT-5, Claude, Gemini, LangChain, LangGraph, vector databases, Pinecone, semantic search, Lovable, SaaS MVP, AI SaaS, workflow automation, Python, Django, FastAPI, React, Angular, Node.js, REST API, AI product development, production-ready AI, scalable AI systems, SaaS development, AI integration, full-stack AI development.

  • Artificial Intelligence
  • React
  • Angular
  • AI Chatbot
  • Large Language Model
  • AI Development
  • OpenAI API
  • LLM Prompt Engineering
  • Python
  • FastAPI
  • Django
  • LangChain
  • Node.js
  • Microservice
  • API Integration
  • Supabase
  • Firebase
  • Vector Database
  • Full-Stack Development
  • Amazon Web Services
Dhiraj S.

Brampton, Canada

$30/hr
5.0
6 jobs

12+ years of experience developing and supporting complex software solutions, with expertise in AI agents using Langgraph,STT,TTS,LiteLLM, RAG, OpenAI, LangChain, LlamaIndex, smolagents by hugging face, Vector stores, Flutter, Firebase, Java, Spring AI, Cloud Native technologies, DevOps, Microservices, REST APIs, and Agile/Scrum methodologies. Developed Capital Market and financial market applications using REST API from scratch, achieving significant performance improvements. Implemented AI-powered solutions leveraging LLM orchestration frameworks and semantic graph technologies. Deployed scalable, highly available and modular software products and introduced methodologies and best practices to software development teams.

  • REST API
  • API
  • API Development
  • Cloud Computing
  • Java
  • Kubernetes
  • MongoDB
  • Python
  • Oracle PLSQL
  • Spring Boot
  • Flutter
  • Apigee
  • LLM Prompt Engineering
  • Flask
  • Retrieval Augmented Generation
Michael O.

Newbridge, Canada

$20/hr
5.0
2 jobs

I'm a Full-Stack Developer who builds fast, production-ready web applications, from polished Next.js frontends to scalable Go or Laravel backends. Most clients come to me when they need a Full-Stack Developer who can own the entire product: architecture decisions, API design, database modeling, frontend performance, and deployment, without needing to coordinate five different contractors. ✅ Next.js App Router specialist — RSC, server actions, dynamic routing ✅ Go (Gin/GORM) backend development for performance-critical APIs ✅ Laravel & PHP for rapid iteration and content-heavy platforms ✅ Available for both short-term projects and long-term contracts ━━━━━━━━━━━━━━━━━━━━━━━━ WHAT I BUILD AS A FULL-STACK DEVELOPER ━━━━━━━━━━━━━━━━━━━━━━━━ → Full-Stack Web Apps from scratch Next.js + TypeScript frontend paired with a Go or Laravel backend, PostgreSQL database, deployed and production-ready. I handle every layer so you're not stitching together work from multiple developers. → REST API Design & Backend Architecture Clean, versioned REST APIs built with Go (Gin) or Laravel. I think about scalability from the start — auth flows, rate limiting, schema design, and clear documentation. → MVP Builds for Startups Got an idea and a deadline? I can take a startup from wireframe to a deployed product fast. My stack is lean and proven — Next.js, Supabase or PostgreSQL, and Go or Laravel, depending on what the product needs. → Performance Optimization & SEO-Ready Builds Full-stack performance work: Core Web Vitals, server-side rendering, JSON-LD schema markup, image optimization, and Lighthouse scores that actually matter for search ranking. → WordPress Development Custom themes, plugin integrations, and performance-tuned WordPress builds — including REST API connections to headless or hybrid Next.js setups. → Codebase Refactors & Feature Additions Inheriting a messy codebase? I come in, map what exists, and improve it without breaking what's already working. ━━━━━━━━━━━━━━━━━━━━━━━━ TECH STACK ━━━━━━━━━━━━━━━━━━━━━━━━ ⚡ Frontend → Next.js, React, TypeScript, Tailwind CSS ⚡ Backend → Go (Gin/GORM), Laravel, PHP, REST APIs ⚡ Database → MySQL ⚡ Other → Git, Vercel, Cloudinary, Resend, WordPress ━━━━━━━━━━━━━━━━━━━━━━━━ WHY CLIENTS WORK WITH ME ━━━━━━━━━━━━━━━━━━━━━━━━ ✔️ Full ownership — I handle frontend, backend, and database. One developer, not a team. ✔️ Ships on time — I set realistic timelines and stick to them. ✔️ Clean code — I write maintainable, documented code you can hand off or build on. ✔️ Proactive communication — Daily updates, plain English, no jargon. ✔️ Thinks like a founder — I flag problems before they become incidents. Whether you need a Full-Stack Developer to build your next product from scratch, add features to an existing codebase, or bring technical structure to an early-stage startup, let's talk. 📩 Send me a message or invite me to your job. Full Stack Developer | Full-stack Developer | Full Stack | Developer | Web Developer | Web Applications | MVP Developer | SaaS Developer | Full Developer | Full-stack-developer | Next.js Developer | React Developer | TypeScript Developer | Go Developer | Laravel Developer | PHP Developer | WordPress Developer | REST API Developer | Backend Developer | Frontend Developer | API Integration | PostgreSQL | Supabase | Tailwind CSS | Node.js | Performance Optimization | SEO Developer | Web App Development | Startup Developer | CMS Integration | Cloudinary | Resend | Vercel | AI Integrations | Gin | GORM | Core Web Vitals | JSON-LD | Server-Side Rendering | SSR | App Router | React Developer | MVP Build | Codebase Refactor

  • REST API
  • Next.js
  • React
  • TypeScript
  • Golang
  • Node.js
  • PHP
  • Laravel
  • MySQL
  • Tailwind CSS
  • Full-Stack Development
  • API Integration
  • WordPress
  • Search Engine Optimization
Waqar Ali S.

Mississauga, Canada

$50/hr
5.0
26 jobs

Helping businesses streamline operations through successful Odoo ERP implementations, customization, integration, and digital transformation. I am an ERP Consultant, Solution Architect, and Odoo Specialist with 15+ years of experience in business software development and process automation. I help organizations implement Odoo Community and Enterprise editions to automate Sales, CRM, Purchasing, Inventory, Manufacturing, Accounting, HR, Projects, Field Service, Recruitment, Helpdesk, and other business operations. As the founder of Innovazy LLP and a Top Rated professional on Upwork, I have successfully delivered ERP, CRM, SaaS, and enterprise software solutions for clients across USA, Canada, and other international markets. ✅ Odoo Services 🔸 Odoo ERP Implementation & Deployment 🔸 Odoo Functional Consulting & Business Analysis 🔸 Odoo Community & Enterprise Customization 🔸 Odoo Module Development 🔸 Odoo Workflow Automation 🔸 Odoo CRM, Sales & Marketing Automation 🔸 Odoo Manufacturing (MRP) Implementation 🔸 Odoo Inventory & Warehouse Management 🔸 Odoo Accounting & Finance Customization 🔸 HR, Payroll & Recruitment Solutions 🔸 Odoo Studio & QWeb Report Development 🔸 Odoo Upgrade & Migration (v15, v16, v17, v18, v19) 🔸 Third-Party API Integrations 🔸 E-Commerce & Website Development 🔸 User Training & ERP Adoption Support ✅ Industry Experience 🔸 Manufacturing & Distribution 🔸 Retail & E-Commerce 🔸 Wholesale 🔸 Restaurants, Cafés, Food & Beverages 🔸 Construction & Contracting 🔸 Interior Design & Furniture Manufacturing 🔸 Real Estate 🔸 Recruitment & Staffing 🔸 Healthcare 🔸 Logistics & Transportation 🔸 Hospitality 🔸 Professional Services ✅ Technical Expertise Odoo Framework, Python, PostgreSQL, OWL, QWeb, XML, JavaScript, REST APIs, AWS, Azure, Docker, CI/CD, React.js, Node.js, .NET, and Enterprise System Integration. My approach focuses on understanding your business processes first and then configuring Odoo to match operational requirements, improve efficiency, increase visibility, and support business growth. Whether you need a complete ERP implementation, migration from legacy systems, custom module development, or ongoing Odoo support, I can help you deliver a scalable and future-ready solution. 💡 Let's discuss your business requirements and transform them into a successful Odoo ERP implementation. Odoo Consultant, Expert Odoo ERP Developer, Odoo ERP Implementation Specialist, Senior Odoo ERP Specialist, Full-Cycle Odoo Implementation, Odoo Customization and Configuration Expert, Odoo ERP Solutions Architect, Odoo Functional and Technical Expert, Odoo Certified ERP Consultant, Python-Based Odoo Developer, Odoo CRM Setup and Implementation, Odoo ERP Developer and Consultant, Odoo Inventory and Stock Management, Odoo Customization and Module Development, Odoo Website Design and Development, Odoo ERP Maintenance and Ongoing Support, Odoo ERP Deployment and Go-Live, Odoo System Configuration and Administration, Odoo Website Customization and Upkeep, Odoo ERP Technical Developer, Odoo Module Setup and Implementation, Odoo Odoo Server Setup and Infrastructure, Odoo Bespoke Module Development, Odoo ERP Project Lead, Senior Python Backend Developer, Odoo ERP Upgrade and Migration Specialist, Odoo Workflow Automation Expert, Odoo Business Process Optimization, Odoo Multi-Company Configuration, Odoo eCommerce and POS Developer, Odoo Accounting and Finance Implementation, Odoo HR and Payroll Configuration Specialist, Odoo Manufacturing and MRP Developer, Odoo Data Migration Expert, Odoo.sh Deployment Specialist, PostgreSQL Database Optimization, Odoo Quality Control Module, Odoo REST API Developer, Odoo Enterprise Edition Expert, Digital Transformation Expert, ERP Software

  • Odoo
  • Odoo Development
  • Odoo Administration
  • ERP Software
  • Enterprise Resource Planning
  • Enterprise Software
  • Enterprise Software Development
  • Accounting Software
  • Point of Sale & Payment Systems
  • Digital Transformation
  • Accounting Tools Setup
  • Python
  • OWL
  • XML
  • CSS
  • HTML
  • JavaScript
  • PostgreSQL
  • Database Management
  • API Integration
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.

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

Toronto, Canada

$18/hr
5.0
10 jobs

MERN Stack & SaaS Developer with 5+ years building scalable web apps, MVPs, and full-stack platforms for startups and growing businesses. I ship clean code and production-ready products on time. If you need a React, Node.js, and MongoDB developer who takes full ownership from architecture to development, you are in the right place. 𝑾𝒉𝒂𝒕 𝑰 𝑩𝒖𝒊𝒍𝒅: ✦ SaaS platforms→ multi-tenant apps, subscription billing (Stripe), role-based auth, admin dashboards ✦ Full-Stack MERN web apps→ React.js / Next.js frontends + Node.js / Express.js backends ✦ REST API & GraphQL development→ secure, documented, scalable API architecture ✦ MVP development → idea to deployed product in weeks, not months ✦ E-Commerce platforms → custom carts, payment gateways, inventory systems ✦ AI integrations → OpenAI API, ChatGPT, LangChain, automation workflows 𝑴𝒚 𝑻𝒆𝒄𝒉 𝑺𝒕𝒂𝒄𝒌: → Frontend: React.js · Next.js · TypeScript · JavaScript · Tailwind CSS · Redux → Backend: Node.js · Express.js · NestJS · REST APIs · GraphQL · WebSockets → Database: MongoDB · PostgreSQL · MySQL · Firebase · Redis → Cloud & DevOps: AWS (EC2, S3, Lambda) · Docker · CI/CD · Vercel · DigitalOcean → Auth & Payments: JWT · OAuth2 · Stripe · PayPal · Razorpay 𝑾𝒉𝒚 𝑪𝒍𝒊𝒆𝒏𝒕𝒔 𝑾𝒐𝒓𝒌 𝑾𝒊𝒕𝒉 𝑴𝒆: ✦ Clean, maintainable code → no spaghetti, no shortcuts ✦ Full ownership → I handle architecture, dev, testing, and deployment ✦ Clear communication → daily updates, transparent milestones, fast responses ✦ Long-term reliability → I build systems that scale as your business grows 𝑰𝒏𝒅𝒖𝒔𝒕𝒓𝒊𝒆𝒔 𝒔𝒆𝒓𝒗𝒆𝒅: SaaS · FinTech · E-Commerce · EdTech · Healthcare · Real Estate · Marketplace CRM/ERP Click “Invite” and let’s turn your idea into a successful, scalable product. MERN Stack Developer | Full Stack Developer | React Developer | Node.js Developer | Next.js Developer | TypeScript Developer | SaaS Developer | MongoDB Developer | REST API Developer | JavaScript Expert | Express.js | GraphQL | AWS Developer | MVP Development | Web App Developer | API Integration | Stripe Integration | NestJS | Redux | Tailwind CSS

  • REST API
  • Full-Stack Development
  • MERN Stack
  • React Native
  • Node.js
  • MongoDB
  • Next.js
  • JavaScript
  • TypeScript
  • ExpressJS
  • SaaS Development
  • GraphQL
  • AWS DeepLens
  • PostgreSQL
  • Tailwind CSS
  • API Integration

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