🔹 Stop hiring developers. Hire someone who understands your product. I build and scale SaaS platforms end to end: Next.js and React on the front, Node.js and Python (FastAPI/Django) on the back, with Stripe, PostgreSQL, and AWS behind them. The kind of product that doesn't break after launch. If it involves APIs, dashboards, subscriptions, integrations, or AI features, I've probably built it before. What I Build Most Often • SaaS platforms (multi-tenant architecture) • Backend APIs (FastAPI, Django, Node.js/Express) • Integrations (OAuth, webhooks, third-party services, CRMs) • Automation & background workers • Analytics dashboards & admin panels (React / Next.js) • Data processing pipelines • Cloud deployments on AWS Why Clients Hire Me Many projects fail after MVP because the backend wasn’t designed for growth. I design for: 1. clean architecture 2. predictable scaling 3. maintainability 4. faster future features So you don’t need to rebuild in 6 months. Recent Work ✔ Built medical platform MVP (Node.js + React), production ready ✔ Designed military social platform infrastructure (Flask + AWS + Docker) ✔ Created organization-wide email compliance & analysis system (OAuth integrations) ✔ Built IoT monitoring platform with real-time device data ingestion ✔ Developed automation workflows & analytics dashboards Tech Stack 1. Backend Python (FastAPI, Django, Flask) Node.js (Express, NestJS) REST APIs, Webhooks, OAuth 2. Frontend React, Next.js, Vue Tailwind, Material UI 3. Data & Infrastructure PostgreSQL, Redis, MongoDB AWS, Docker, CI/CD Large dataset processing & reporting If you need someone who can own both the architecture and implementation, message me before hiring multiple developers.

𝐈 𝐁𝐮𝐢𝐥𝐝 𝐚𝐧𝐝 𝐃𝐞𝐩𝐥𝐨𝐲 𝐂𝐨𝐦𝐩𝐥𝐞𝐭𝐞 𝐏𝐫𝐨𝐝𝐮𝐜𝐭𝐢𝐨𝐧 𝐒𝐲𝐬𝐭𝐞𝐦𝐬 I help startups and growing teams design, build, and deploy scalable web applications, from frontend UI to backend APIs to cloud infrastructure. Using React, Python (FastAPI), and AWS, I deliver systems that are secure, high-performance, and built to scale from day one. I don't just write features. I build systems that survive real traffic. 𝐌𝐨𝐬𝐭 𝐭𝐞𝐚𝐦𝐬 𝐜𝐨𝐦𝐞 𝐭𝐨 𝐦𝐞 𝐰𝐡𝐞𝐧 𝐨𝐧𝐞 𝐨𝐟 𝐭𝐡𝐫𝐞𝐞 𝐭𝐡𝐢𝐧𝐠𝐬 𝐢𝐬 𝐡𝐚𝐩𝐩𝐞𝐧𝐢𝐧𝐠: . The app works but nobody wants to touch the deployment. I set up proper CI/CD, containerize the stack, and get it into a state where pushing to production isn't a stressful event. . The codebase grew fast and now it's fragile. I come in, understand what exists, and restructure it so the next six months don't require a full rewrite. . They're starting fresh and want to do it right the first time. Full stack, properly architected, with infrastructure as code and monitoring from day one, not bolted on later. 𝐖𝐡𝐚𝐭 𝐈 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡 𝐝𝐚𝐢𝐥𝐲: Frontend: React, component architecture, state management, API integration Backend: Python, FastAPI, REST APIs, JWT and OAuth2 auth, background workers (Celery) Databases: PostgreSQL, MongoDB, Redis, clean schema design AWS: EC2, RDS, S3, Lambda, VPC, IAM, CloudFront, Route 53 Infrastructure as Code: Terraform CI/CD: GitHub Actions, GitLab CI, Jenkins, Docker, Kubernetes Monitoring: logging, alerting, autoscaling for production reliability 𝐇𝐨𝐰 𝐈 𝐰𝐨𝐫𝐤: I take full ownership. Frontend, backend, infra, if it breaks in production, it's my problem too. I write things down. The next developer on your project shouldn't need to call me to understand what was built. I'll tell you when the scope is wrong or the approach won't hold. You're paying for judgment, not just someone to execute tickets. 𝐖𝐡𝐨 𝐈'𝐦 𝐩𝐫𝐨𝐛𝐚𝐛𝐥𝐲 𝐧𝐨𝐭 𝐭𝐡𝐞 𝐫𝐢𝐠𝐡𝐭 𝐟𝐢𝐭 𝐟𝐨𝐫: If you need something hacked together fast with no thought for what happens in three months, I'm not your guy. I build things that don't fall apart when real traffic hits or when someone else has to touch the code. If you're launching a SaaS, scaling infrastructure that's starting to crack, or tired of a codebase only one person understands, let's discuss.

Java sits at the center of the platforms I build. Spring Boot runs the backend services and APIs, handling business logic, data access, and the core behavior of the system. Many of these platforms pair a Spring Boot backend with Angular on the frontend, forming structured web applications such as internal dashboards, operational platforms, and SaaS systems used by teams every day. Angular provides the application interface while the Java backend manages services, data, and integrations behind the scenes. Python also comes into play when automation or data workflows are needed. Small services and scripts written in Python handle background tasks, integrations, and operational processes that support the main platform. Java and Spring Boot handle the backend services, Angular runs the platform interface, and Python supports automation and background tasks.

I’m a reliable Full Stack Developer with 8+ years of hands-on experience building high-performing web apps, SaaS platforms, and cross-platform solutions for businesses across the US, UK, and Europe. I’ve completed 7000+ hours here on Upwork, delivering consistent, high-quality results and long-term client relationships. I work full-time during US business hours (9AM–7PM EST/CST) and handle projects end-to-end - from concept to deployment and scaling. - Frontend: React, Next.js, Vue.js, Tailwind, Bootstrap - Backend: Node.js, Django, Flask, FastAPI, TypeScript, Python - Databases: PostgreSQL, MongoDB, MySQL, Supabase - DevOps & Cloud: Docker, GitHub Actions, AWS, GCP, Azure - AI & Automation: OpenAI, Langchain, custom GPT bots, AI chat assistants, Zapier, Rasa - Cross-Platform Apps: React Native, Flutter, Ionic - APIs & Integrations: REST, GraphQL, Firebase, Stripe, Twilio, SendGrid Recent Focus Areas: • Building AI-powered tools and GPT-integrated chatbots • Developing end-to-end SaaS platforms with real-time features • Delivering solutions in CRM, healthcare, real estate, edtech, and on-demand apps • Automating business processes using LLMs and APIs ✅ 9000+ Upwork hours - consistent, proven track record ✅ Clean, scalable, production-ready code ✅ Transparent communication & dependable delivery ✅ Fast turnarounds without compromising quality If you’re looking for someone who’s proactive, detail-oriented, and easy to work with, I’d love to help bring your next project to life.

Senior Data Engineer with 7+ years building scalable ETL/ELT pipelines, real-time data processing, and cloud-native data platforms on AWS. 100% Job Success, Top Rated, $40K+ earned. I help startups and data teams move data reliably — from ingestion to analytics-ready APIs — and increasingly, into LLM/RAG workloads. WHAT I BUILD: - ETL/ELT pipelines — batch & near-real-time ingestion from APIs, databases, and event streams (Kafka, message queues) - Data modeling & warehousing — PostgreSQL, MongoDB, Redis, Elasticsearch, optimized for query performance and analytics - Backend data services — FastAPI, Flask, Django; REST & GraphQL APIs that expose clean, validated data to downstream apps and dashboards - AI/LLM data pipelines — RAG systems, embedding workflows, vector search (Pinecone, FAISS) using OpenAI APIs and LangChain - Cloud & deployment — AWS (EC2, Lambda, S3, RDS, API Gateway), Docker, serverless, CI/CD with GitHub Actions RESULTS I'VE DELIVERED: - Improved query performance by 30% through indexing and storage strategy - Cut infrastructure costs 25% via serverless and optimization - Reduced deployment time 45% with CI/CD automation - Maintained 99.5%+ uptime across production environments HOW I WORK: Clear communication, fast turnaround, and production-grade code — not prototypes that break. I treat your data infrastructure like it's my own: documented, tested, and built to scale. If you need a data engineer who can also bridge into AI/ML workloads, let's talk. Send me a message with your project and I'll tell you honestly whether I'm the right fit.

Hi there, I’m Bera, a Backend Engineer, API Developer and backend-first Full Stack Engineer focused on building scalable SaaS platforms, API-driven systems, cloud-ready applications and production-grade backend infrastructure. My work sits at the intersection of Backend Engineering, API Development, SaaS Development, Cloud Infrastructure, DevOps and Full Stack Development. I help teams turn product ideas, internal workflows and legacy systems into reliable web applications, backend services, API-first platforms and modern software systems that can perform in real production environments. As a Backend Engineer, I design and build the core systems behind SaaS platforms, custom software products and internal tools. My work often includes backend architecture, RESTful APIs, database design, authentication, permissions, integrations, background jobs, caching, monitoring and performance optimization. As an API Developer, I focus on building clean, scalable and well-structured APIs that connect products, databases, internal tools and third-party services. This includes API architecture, API integration, backend services, data flows, webhook logic, external platform integrations and secure communication between systems. As a backend-first Full Stack Engineer, I can also support the frontend layer when needed, but my strongest focus is the backend logic, APIs, databases, cloud deployment and infrastructure that make the product reliable, maintainable and ready to scale. I’m typically hired to help with: - Backend Engineering for SaaS platforms and custom software products - API Development, RESTful APIs and third-party API integrations - Backend architecture for scalable web applications - SaaS platform development and backend modernization - Database design, query optimization and data-driven systems - Cloud deployment, infrastructure setup and DevOps workflows - CI/CD pipelines, Docker, Kubernetes and production environments - Authentication, authorization, permissions and secure backend logic - Performance improvement, caching, Redis and backend optimization - Full Stack Development where strong backend ownership is required - Internal tools, dashboards, admin panels and operational platforms - Legacy system redesign and backend refactoring Core strengths: - Backend Engineer: backend architecture, APIs, services and production systems - API Developer: RESTful APIs, API integrations, webhooks and data flows - SaaS Developer: SaaS platforms, internal tools and scalable product foundations - Full Stack Engineer: React, Node.js, Python, JavaScript and web applications - Cloud & DevOps: AWS, Docker, Kubernetes, CI/CD and deployment workflows - Databases: PostgreSQL, MySQL, MongoDB, Redis and database-driven systems Example results: - Reduced deployment cycles by automating build, test and release workflows - Improved API latency and throughput with Redis, caching and database tuning - Increased reliability through cloud-native architecture and zero-downtime deployments - Helped teams modernize backend systems, improve maintainability and ship faster I focus on software that is cleanly structured, easy to maintain and built for real production use, not just quick demos or surface-level frontends. If you need a Backend Engineer, API Developer or backend-first Full Stack Engineer who can help you build or modernize a product from backend logic to deployment, feel free to invite me on Upwork or send me a direct message.

AI systems should do more than just look impressive. They should automate workflows, improve decisions, and create measurable business value. I’m an AI Automation Engineer with 5+ years of experience building AI agents, workflow automation systems, and production-grade Python applications. I help startups and businesses automate operations using Python, n8n, FastAPI, RAG pipelines, OpenAI, LangChain, Django, and LLM-powered agent systems. 𝗥𝗲𝗰𝗲𝗻𝘁 𝗽𝗿𝗼𝗷𝗲𝗰𝘁𝘀 𝗶𝗻𝗰𝗹𝘂𝗱𝗲: ⤷ AI-powered workflow automation systems ⤷ Custom GPT and LLM integrations ⤷ Backend APIs and SaaS platforms ⤷ Web scraping and data extraction pipelines ⤷ Time-series analytics and AWS-based systems ⤷ Internal AI tools and business process automation 𝐖𝐡𝐚𝐭 𝐈 𝐜𝐚𝐧 𝐡𝐞𝐥𝐩 𝐲𝐨𝐮 𝐰𝐢𝐭𝐡: ⤷ AI Automation & AI Agents ⤷ OpenAI / GPT Integrations ⤷ LangChain & LLM Applications ⤷ Python Backend Development (FastAPI, Django, Flask) ⤷ REST APIs & SaaS Architectures ⤷ Web Scraping & Data Pipelines ⤷ PostgreSQL, Redis, Celery, Docker, AWS ⤷ Deployment, Scaling & Performance Optimization Python & AI Automation Stack Python · FastAPI · LangChain · LangGraph · OpenAI · Anthropic Claude · n8n · PostgreSQL · Redis · ChromaDB · Docker · AWS · Supabase · Celery · RabbitMQ 💬 Why Clients Hire Me for AI Automation ⤷ Top-rated 5-star developer ⤷ Smooth communication and fast turnaround ⤷ Focused on long-term collaboration and clean code Whether you need an AI MVP, AI agent, Python backend, automation platform, or custom AI workflow, I can help turn your idea into a reliable production-ready product. 📈 Let's build your next AI automation solution with performance, stability, and future scale in mind. 📩 Message me to discuss your project. Also searched as: FastAPI developer, LangChain engineer, LangGraph developer, AI agent developer, n8n developer, RAG developer, agentic AI engineer, Python automation engineer, OpenAI integration developer, AI workflow automation engineer, backend API developer, LLM application developer, Python backend engineer, multi-agent system developer, n8n automation specialist, LangChain RAG developer, FastAPI backend developer, AI agent builder.

Ruby on Rails and Vue.js full-stack developer with 8+ years of experience building SaaS platforms, marketplaces, CRM systems, and healthcare applications from scratch. I’ve shipped production systems handling 1M+ monthly transactions, built a pharma analytics platform used by enterprise B2B clients for over 6 years, and delivered Vue.js and Node.js applications for clients across the US, EU, and UK. 🧠 Backend: Ruby on Rails, Ruby, REST APIs, GraphQL, PostgreSQL, MySQL, Redis, Sidekiq, Apache Kafka, JWT, OAuth2, RSpec (90%+ test coverage), Capybara, Swagger 🎨 Frontend: Vue.js, Vue 3, Nuxt.js, Vuex, Pinia, Vue Router, JavaScript, TypeScript, Tailwind CSS, Hotwire, Stimulus, WebSockets, Stripe integrations ⚙️ Infrastructure: Docker, GitHub Actions, AWS S3, Azure, Heroku, Nginx, Capistrano, CI/CD pipelines What this looks like in practice: → Built and maintained REST and GraphQL APIs consumed by Vue.js SPAs with clean architecture, versioning, and full documentation → Optimized complex PostgreSQL queries, improving performance in systems with 1M+ monthly transactions → Migrated CI/CD pipelines from CircleCI to GitHub Actions, reducing costs while maintaining production stability → Implemented Kafka-based event streaming and optimized data flows in microservice-based systems → Integrated Stripe payments and real-time WebSocket features in Vue.js and Node.js / NestJS applications → Refactored and extended legacy Ruby on Rails systems without breaking existing functionality → Maintained 90%+ test coverage using RSpec and Capybara in production-grade systems How I work: I communicate clearly from day one, define scope before development starts, identify risks early, and keep progress transparent throughout the project. I’ve worked both independently on full-stack products and in distributed teams with async workflows. Looking for a Ruby on Rails or Vue.js developer who delivers reliable production systems, not just code commits? Let’s talk.

Data and AI teams hire me when they need one engineer who can own the Python backend, build the ETL pipeline, and integrate LLM models without splitting that into three separate roles. 6 years, AWS Certified Cloud Practitioner, 100% JSS, $20K+ earned on Upwork. One unusual differentiator: I hold a Master's degree in Radiology from Kharkiv National Medical University. For Healthcare AI and medical data products, I understand the domain, not just the stack. What I have built: AI Website Builder (2 years, Lead, team of 15): led backend architecture for an AI-powered page generation platform. LLM content generation, SEO processing, async delivery via Celery and Redis. Stack: FastAPI, OpenAI, LangChain, PostgreSQL, AWS, Docker, React, Stripe. Sensitive Data Monitoring SaaS (1.5 years): high-load backend scanning cloud sources for sensitive data leaks. Distributed processing with Kafka, NLP and OCR detection pipelines, Elasticsearch and Cassandra at scale. Stack: Python, FastAPI, Kafka, Elasticsearch, Neo4j, Redis, AWS. Blockchain Security Platform (1 year, team of 13-15): ETL pipelines for detecting suspicious wallet behavior across blockchain data. Graph database modeling with Neo4j, full AWS infrastructure. Stack: Python, FastAPI, Neo4j, PostgreSQL, AWS (EC2, ECS, RDS, Lambda). Web Automation Platform (1 year): reverse-engineered authenticated HTTP request flows, automated login and data extraction workflows, session management and CSRF handling. Stack: Python, asyncio, aiohttp, Playwright, Docker. On Upwork: 10 contracts, $20K+ earned, 313 hours, 100% JSS. Python ETL, web automation, data extraction, scraping pipelines. How I work: Requirements and solution design before implementation. I take ownership from spec to production. Unit tests, async-aware Pytest coverage, API documentation maintained throughout the project. I communicate clearly on blockers without being asked. I operate with the full backing of Meduzzen's senior engineering team. Every commit I ship is peer-reviewed by our internal technical leads before deployment. If I am unavailable, your sprints do not stop: a fully briefed Meduzzen engineer provides immediate coverage. One point of contact, zero single-point-of-failure risk. Core stack: Python, FastAPI, Django, PostgreSQL, Redis, Celery, Kafka, Elasticsearch, Neo4j, Docker, Kubernetes, AWS (EC2, ECS, RDS, Lambda, S3), LangChain, OpenAI, React, TypeScript, GitHub Actions. If you need a Python backend engineer who can own data pipelines and AI integration in the same role, send me the architecture brief. I will tell you how I would structure it.

If your backend is slow, your APIs keep breaking under load, or your AI features feel bolted on instead of built in, that's usually where I come in. I build Django and FastAPI backends on AWS for SaaS and AI products that need to stay fast under real user load, not just pass a demo. Most of my work is either fixing slow APIs and deployment bottlenecks or shipping new backend features (REST APIs, async jobs, LLM/RAG integrations) for teams that outgrew their first architecture. I'm a senior Python backend developer based in India, with 8+ years, top-rated, and 100% job success. What I work on day to day: ★ REST APIs and backend services (Django/DRF, FastAPI, Flask when it fits) ★ Cloud deployments on AWS: EC2, S3, RDS, Lambda, Docker, CI/CD pipelines ★ Async and background jobs: Celery, Redis, RabbitMQ for queues, reports, notifications ★ AI and LLM integration: RAG workflows, chatbots, automation pipelines (OpenAI, Gemini, Grok APIs; not just prompt wrappers) ★ Backend refactoring: slow queries, messy codebases, deployments that break every release ★ Microservices where it makes sense: not microservices for the sake of it A few projects I've led or built recently: Astrosure.ai: AI-powered astrology platform from scratch. I led the backend: Django and FastAPI services, birth chart processing, dosha/dasha rules, and the Agastyaa chatbot with LLM integration. Deployed on AWS with Docker and CI/CD on EKS. HerKey (herkey .com): India's largest career platform for women. Built scalable APIs for job matching, session booking, and notifications. Django REST Framework, MongoDB, Elasticsearch, Kubernetes on AWS. We cut incident triage time by around 40% after improving monitoring and deployment flow. Riyaah (riyaah.sa): Beauty e-commerce platform in Saudi Arabia. Backend for product catalog, orders, and payment flows. Django, PostgreSQL, AWS. Before Upwork, I worked with Capgemini (banking/ANZ), Flooid, Keuro Digital, and Bricksteel, mostly backend, team lead, and client-facing delivery. I also run Sparkscribe Technologies for larger or long-term engagements where you need more than one developer. On Upwork you work with me directly. For larger scopes, I may involve senior developers from my company under my technical lead, only with your approval and with me owning architecture and delivery. How I usually work with clients: I keep communication straightforward, regular updates, and clear ETAs, with no disappearing mid-sprint. I've managed small teams (up to 10 devs), done code reviews, and set up CI/CD and monitoring so releases don't turn into firefights. Most of my Upwork clients mention responsiveness and clean delivery in their reviews. If you need someone who can own the backend end-to-end architecture, APIs, cloud, AI integration, and production stability, send me a message with a short description of what you're building. I'll reply with honest thoughts on scope and how I'd approach it.