Hello! I am Hamayun, a Node.js and NestJS backend developer specializing in scalable APIs, SaaS platforms, and blockchain-powered applications built with NestJS, PostgreSQL, and TypeScript. With 6+ years of backend experience, I help startups and product teams ship production-ready systems that perform under real-world load. Clean architecture, no shortcuts. What I build: ✅ REST & GraphQL APIs with authentication, RBAC, and third-party integrations ✅ SaaS backends with multi-tenancy, subscription billing (Stripe), and user management ✅ Blockchain and Web3 backends with token systems, smart contract integrations, and transaction pipelines ✅ Real-time features using WebSockets and event-driven architecture ✅ Database design and query optimization with PostgreSQL and TypeORM ✅ Cloud deployments on AWS with Docker and CI/CD pipelines Recent projects I've built backends for: ✅ Refecoin. com: A blockchain platform for synthetic real estate token trading ✅ Tournated. com: An all-in-one sports management SaaS used by federations and clubs globally ✅ Servita. com: An AI-powered digital transformation platform serving enterprise clients My preferred tech stack: Node.js · NestJS · PostgreSQL · TypeScript · GraphQL · Redis · AWS · Docker · Stripe The approach is simple: build systems that are stable, fast, and easy to extend as the product grows. If you're working on something where backend performance, structure, or scalability actually matters, feel free to share the details.

I’m a backend-focused Full Stack Software Engineer with 4+ years of experience building APIs, database-driven systems, automation workflows, AI integrations, and production-ready backend platforms. My strongest areas are Supabase/PostgreSQL, REST APIs, Node.js, Python, TypeScript, Stripe, webhooks, automation workflows, Docker, Linux, and backend architecture. Recently, I worked on a Supabase/PostgreSQL-based payment and pricing engine with seasonal pricing, tier-based rules, override logic, PostgreSQL functions/triggers, and optimized database views. I’ve also built event-driven systems using Supabase Edge Functions, PostgreSQL triggers, Stripe subscriptions, onboarding automation, and third-party API integrations. I can help with: - Supabase backend development, RLS policies, Edge Functions, migrations, auth, and storage - PostgreSQL schema design, functions, triggers, views, indexes, and performance optimization - REST API development using Python, Node.js, NestJS, Express, Flask, and TypeScript - Stripe payments, subscriptions, webhooks, paywalls, and access control - API integrations, webhooks, Make .com/n8n-style workflows, and backend automation - Python scripting, data extraction, CSV/JSON processing, and scheduled jobs - Production debugging, Docker/Linux deployments, Nginx/Caddy, CI/CD, and server configuration - AI/LLM integrations, prompt workflows, structured outputs, and AI-assisted backend features A few highlights: - Winner of the Safaricom Ethiopia M-Pesa SDK Challenge, Python category - Built a Python SDK for M-Pesa APIs including STK Push, C2B, B2C, authentication, callbacks, and transaction handling - Worked on LLM model training and evaluation for ByteDance Seed Model 1.6 - Built and maintained Supabase/PostgreSQL systems with RLS, Edge Functions, triggers, and event-driven workflows - Managed Docker-based services including n8n and Metabase, with secure reverse proxy setup using Nginx/Caddy I’m best suited for projects where clean backend logic, data integrity, reliability, automation, and practical problem-solving matter.

I build fast, reliable backend systems that scale REST APIs, database architectures, and microservices that just work. My stack centers on Python (Django) and Java (Spring Boot), backed by solid PostgreSQL database design and optimization. Whether you need a clean API from scratch, a legacy system refactored, or a backend that handles real production traffic, I deliver clean, well-documented code with clear communication at every step. I treat every project like my own product: tested, documented, and built to last. Let's talk about what you need, I'm ready to start.

I'm a senior full-stack engineer with 12+ years of experience building SaaS platforms, workflow automation systems, and integration-heavy backend services used by real businesses at scale. My core work lives at the intersection of backend architecture and product delivery designing multi-tenant systems, API-first platforms, document processing pipelines, and operational dashboards that teams actually rely on. What I've built: A bookkeeping automation platform with OCR extraction, OpenAI enrichment, and QuickBooks sync via QBWC/QBXML (FastAPI + PostgreSQL + React + Electron) A logistics operations platform managing dispatch workflows, lifecycle tracking, and RBAC across multiple user roles Backend systems supporting 5,000+ concurrent users, processing 1,500+ daily orders, and handling 10,000+ data entries/day Where I add the most value: SaaS platform architecture (multi-tenant, RBAC, workflow engines) API orchestration and third-party integrations (REST, GraphQL, OAuth/JWT, Stripe) AI-powered pipelines (OpenAI APIs, structured extraction, document intelligence) CRM-style systems, ERP dashboards, and operations tooling Stack: Python (FastAPI), Node.js, React, Next.js, TypeScript, PostgreSQL, MongoDB, AWS, Supabase, GraphQL I work best on projects where architecture decisions matter not just feature delivery. If you're building something that needs to scale, integrate cleanly, and be maintained long-term, let's talk.

🚀 Need a reliable developer to build scalable web solutions? With over 2 years of experience, I specialize in Python, Django, DRF, and AWS. I help businesses turn ideas into high-performance, secure, and maintainable applications. What I bring: ✅ Clean, scalable backend systems (REST APIs, automation, databases) ✅ Fast, responsive frontend using React, Vue3 ✅ Clear communication and on-time delivery 📩 Let’s connect, I’m ready to help you succeed.

Results-driven Data Engineer with 14+ years building scalable, high-performance cloud data platforms. I specialize in the Snowflake Cloud Data Warehouse, Microsoft Fabric, and Databricks, turning complex business requirements into reliable, automated data architectures across Snowflake, Azure, Fabric, and AWS. What I do: • Cloud Data Warehousing — Snowflake (SnowSQL, Snowpipe, Streams & Tasks for near real-time ingestion/transformation, Cortex Search & Cortex Analyst) • Microsoft Fabric — end-to-end Lakehouse/Warehouse on OneLake, medallion architecture (bronze/silver/gold), Materialized Lake Views, Data Factory pipelines, and Direct Lake Power BI models • Databricks — Lakehouse with Delta Lake, PySpark/Spark SQL transformations, and medallion ELT pipelines • ETL/ELT Pipelines — robust pipelines with Azure Data Factory and dbt to extract, transform, and load data into cloud warehouses and lakehouses • Data Modeling & Transformation — dbt-based and Spark-based modeling and warehouse/lakehouse transformations • Cloud Data Services — Azure SQL, Storage, Logic Apps, Azure Functions; AWS EC2, S3, RDS • Automation & Scripting — PowerShell, Python, and BCP for data movement and pipeline automation • Database Performance & Migration — tuning and migrating SQL Server, PostgreSQL, and MySQL, on-prem and to the cloud • CI/CD & Version Control — Git/GitHub/GitLab with CI/CD for data deployments Certifications: • SnowPro Core (COF-C02) • Microsoft Certified: Fabric Data Engineer Associate (DP-700) Why work with me: high-quality delivery, proactive communication, and solutions tailored to your data needs.

If you're building an AI-powered product, automating a data pipeline, or replacing a manual workflow with intelligent Python systems , I've probably already solved your problem. I'm a Python backend and AI automation engineer with 4+ years and 60+ Upwork projects, all 5-star. My work lives at the intersection of FastAPI, LLM integration (OpenAI, Claude, Gemini), and production-grade automation , the kind that actually runs in the background without breaking. What I build: AI agents and autonomous workflows using LangChain, OpenAI Assistants, and custom tool-calling systems Web scraping infrastructure that bypasses anti-bot systems at scale (Scrapy, Playwright, Selenium) FastAPI/Django backends with clean architecture, deployed on AWS with Docker Data pipelines and automation systems that eliminate hours of manual work weekly Results that matter: a recommendation engine that lifted sales conversions 15%, microservices running at 99.9% uptime for 12+ months, a scraping system processing 500K+ records daily. I don't disappear after delivery. 70%+ of my clients come back for the next project , which is the metric I actually care about. Tell me what you're building. I'll tell you if I'm the right person for it.

Senior Linux/DevOps Engineer & AI Automation Specialist Senior Linux/DevOps Engineer and AI Automation Specialist with 15+ years of experience designing, building, and scaling cloud-native infrastructure and intelligent workflow systems. My background combines deep cloud architecture expertise (AWS-focused) with hands-on experience building AI-powered automation using n8n, LLM APIs (OpenAI, OpenRouter), vector databases, and secure cloud environments. Most recently, I've led DevOps and cloud-security engineering for a U.S.-based healthcare SaaS platform (physician scheduling) operating under HIPAA and SOC 2. The work spans secure AWS operations, fleet patch management across mixed Windows/Linux estates, EKS lifecycle management, and building the security tooling and audit evidence that underpin a SOC 2 program — turning compliance requirements into reliable, automated, production-grade controls. Cloud & Infrastructure Expertise Over 12 years of AWS experience designing secure, scalable, production-grade environments across healthcare, banking, and enterprise sectors. AWS Services EC2, RDS, EKS, VPC, IAM, S3, CloudFront, Route53, Elastic Beanstalk, SQS, EFS, ElastiCache, Redshift Systems Manager (SSM), GuardDuty, Security Hub, AWS Config, Inspector, CloudTrail Infrastructure as Code Terraform & CloudFormation — multi-account secure environments ADR-driven design and Strangler Fig migration strategy Containers & Orchestration Kubernetes (EKS), Docker, ECS, Docker Swarm EKS cluster lifecycle management — Kubernetes version upgrades across dev/staging/prod CI/CD Jenkins, GitLab CI/CD, CircleCI, CodePipeline, ArgoCD GitHub Actions with ARC (Actions Runner Controller), Azure DevOps self-hosted agents GitOps & Kubernetes Configuration Management ArgoCD (declarative continuous delivery, app-of-apps pattern, multi-cluster sync), Kustomize (base/overlay structuring, environment promotion, patch management), Helm (chart authoring, versioning, values management across environments). GitOps workflows with full audit trail and rollback capabilities. Designed and operated production GitOps pipelines for EKS clusters in regulated environments. High Availability HAProxy, Nginx, Load Balancers, Heartbeat Led infrastructure teams in banking environments and designed highly available Kubernetes production systems for U.S.-based healthcare companies. Security, Compliance & Governance (SOC 2 / HIPAA) Hands-on implementation and continuous evidence for compliance programs in regulated healthcare environments. SOC 2 control implementation and evidence collection across multiple AWS accounts (logical access, audit logging, encryption, change management, patch management) HIPAA-aware architecture: least-privilege IAM, encryption at rest and in transit, end-to-end audit trails, and EDR coverage across the fleet AWS-native security stack: GuardDuty, Security Hub, AWS Config, Inspector, CloudTrail Prowler (soc2_aws framework) and Vanta (GRC) for continuous control mapping and posture monitoring AWS IAM Identity Center (SSO): MFA enforcement, permission sets, SAML federation, CC6.1 remediation EDR migration: CrowdStrike Falcon → Microsoft Defender, with continuity of endpoint protection enforced as a hard gate Immutable S3 evidence stores, fleet-wide backup-policy review, and EBS encryption rollout for compliance Multi-account delegated-administrator security posture (Security Hub / Config) Architecture Decision Records (ADRs) for traceable, auditable change governance Windows Server & Mixed-Fleet Operations Operated a ~70-instance EC2 fleet (Windows Server + Linux) plus ~35 EKS worker nodes AWS Systems Manager: Patch Manager (AWS-RunPatchBaseline), Session Manager, Fleet Manager, Run Command Established a formal monthly patch cadence; raised Windows patch compliance from a low baseline to ~84% Windows Server lifecycle / EOL planning: Server 2016 → 2022 upgrade and decommission roadmaps aligned to patch-management policy KB-level risk triage (e.g., hostname-length reboot risks on domain members) with documented remediation Active Directory domain controllers and SQL Server hosts (HA production pairs, RDS member servers, performance tuning) Safe-patch workflow with pre-patch EBS snapshots and post-reboot service validation Observability & Monitoring Datadog, New Relic, Zabbix — agent consolidation and cost optimization across EKS and production hosts Networking & Secure Access Tailscale (subnet routers, zero-trust access), VPC design, Route53, Load Balancers AI Automation & Workflow Engineering Beyond infrastructure, I specialize in AI-powered workflow automation: n8n workflow design (cloud & self-hosted) LLM integration (OpenAI, OpenRouter, local models) RAG architectures (Qdrant, vector search, embeddings) AI-driven CRM automation Intelligent document processing Automated client intake & communication systems Secure AI pipelines for regulated industries I design workflows that are secure, easy to maintain, scalable

I'm an Odoo Engineer with over 7+ years of experience implementing and customizing ERP solutions, with a passion for Business Process Automation. In my Odoo journey, I’ve had the privilege of working on diverse projects for clients worldwide, enhancing their business operations through tailored Odoo ERP solutions. Here’s a snapshot of my experience: Swiss Project: I spearheaded the migration from SAP to Odoo ERP, developing custom modules for Swiss QR code e-billing, multi-country tax calculations, and procurement/order management. I also built a corporate website and APIs for integration with their proprietary payroll system. US Project: I crafted a custom unified view for various modules, developed a backend theme, and integrated the system with a mobile app. Australian Project: I developed custom APIs and a mobile app for a client in the construction & audit industry. Belgian Project: I managed a services project involving theme development, custom module development, and handling Odoo related tasks/tickets/bugs. In addition to these, I’ve enhanced the community Odoo version with custom features for a Swiss-based ERP/CRM and IT service provider. These enhancements include payment reconciliation functionality, invoice generation with barcode payment information for Swiss companies, Azure AD integration including Microsoft SSO, proprietary HRMS integration, SharePoint integration for project file management, and Stripe payment integration. I’ve also worked on various other Odoo customization projects, including the Payroll Reports Module from Odoo v10 to v14, the Payroll module from v11.0 to v14.0, a Transaction module for a Real estate business from v15.0 to v16.0, and an Accounting module from v15.0 to v16.0. My clients for development and maintenance work in Odoo include 2bit , wift, and powagroup. I’ve successfully customized Odoo apps to meet the specific needs of my clients across different industries, including construction, retail, and manufacturing. I provide ongoing Odoo maintenance and support, and perform customization and feature enhancements in their Odoo ERP system to meet their business requirements. My team is involved in Odoo standard unit testing to ensure error-free working of their Odoo ERP system. I have migrated Odoo modules from older versions to the latest version i.e. Odoo 14 and also enhanced its features according to the client’s requirements. This extensive experience with Odoo ERP implementation and customization makes me a valuable asset in any Odoo-related project. I am always happy to discuss requirements in more detail and provide tailored solutions that meet specific needs. I look forward to hearing from potential clients and partners. Best Regards. Megha

Your Next.js app needs more than someone who knows the framework — it needs an engineer who's shipped production-grade systems, owns the full stack from database schema to deployment pipeline, and won't disappear when things get complicated. That's what I bring. I've spent over 12 years building web and mobile products — the last several years focused heavily on AI integration and model development, Next.js, PostgreSQL, and the modern full-stack ecosystem. I work across the entire lifecycle: architecture decisions, API design, database modelling, CI/CD pipelines on Vercel or any cloud service, and AI feature integration when that's part of the brief. What I typically build: - Next.js apps (App Router, Server Components, SSR/SSG/ISR) - PostgreSQL schemas designed for scale — row-level security, pgvector for AI features, query optimisation - REST and tRPC APIs with TypeScript end-to-end - Auth systems (NextAuth, Clerk, custom JWT flows) - Vercel deployments with CI/CD, preview environments, and environment management - AI-powered features using OpenAI or Claude APIs integrated cleanly into Next.js backends - Python microservices when the job needs heavy data processing or ML alongside the JS stack I've built production systems used by over 5 million users — including official applications across for Telecom giants — and I serve on the United Nations Expert Roster providing AI and engineering consultancy to United Nations (UNDP offices) across the continent. Also Lead Engineer on an AI product in collaboration with Google and Anthropic teams. On Upwork: Top Rated · 100% Job Success Score · If you need a senior engineer who can think through your architecture, write clean code, and ship reliably, let's talk. Next.js · PostgreSQL · TypeScript · Node.js · React · Vercel · Python · REST API · Supabase · CI/CD · Docker · AWS · OpenAI API · Prisma · tRPC · TailwindCSS . Stripe .