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𝐍𝐞𝐞𝐝 𝐚 𝐒𝐚𝐚𝐒 𝐩𝐫𝐨𝐝𝐮𝐜𝐭 𝐛𝐮𝐢𝐥𝐭 𝐨𝐫 𝐚𝐧 𝐌𝐕𝐏 𝐬𝐡𝐢𝐩𝐩𝐞𝐝 𝐟𝐚𝐬𝐭 𝐰𝐢𝐭𝐡𝐨𝐮𝐭 𝐟𝐚𝐥𝐥𝐢𝐧𝐠 𝐚𝐩𝐚𝐫𝐭 𝐚𝐭 𝐬𝐜𝐚𝐥𝐞? That's what I do. I'm a full-stack developer and solution architect with 15+ years building SaaS platforms end to end, from MVP to production systems serving hundreds of thousands of daily users. Whether you're validating an idea with an MVP or scaling an existing SaaS product, you get one senior engineer accountable for the outcome. I'm also part of Bela Supernova, a full-cycle software development company with 50+ engineers serving enterprise clients across EMEA since 2013. You get a senior developer working hands-on on your project, backed by a complete team: full-stack, AI/ML, DevOps and data engineers - so you can scale from one developer to a full delivery unit without changing your point of contact. What I build: 🔷 SaaS Platform Development - multi-tenant SaaS products, customer-facing apps and internal admin dashboards, subscriptions, role-based access, reporting. Built one serving 𝟐𝟎𝟎𝐊+ 𝐝𝐚𝐢𝐥𝐲 𝐮𝐬𝐞𝐫𝐬 𝐚𝐜𝐫𝐨𝐬𝐬 𝟐𝟎+ 𝐜𝐨𝐧𝐟𝐢𝐠𝐮𝐫𝐞𝐝 𝐞𝐧𝐯𝐢𝐫𝐨𝐧𝐦𝐞𝐧𝐭𝐬 𝐢𝐧 𝟏𝟐 𝐜𝐨𝐮𝐧𝐭𝐫𝐢𝐞𝐬. 🔷 MVP Development - fast, focused MVPs that prove the idea and don't need rewriting six months later. I ship a working slice first, then harden it - architecture that survives the transition from MVP to real product. 🔷 AI & LLM Features - AI built into SaaS products as a core differentiator, not a bolted-on chatbot: LLM assistants, semantic search, embeddings, automated workflows with guardrails and cost control. Architected an AI platform running at 𝟏𝟐𝐌+ 𝐝𝐚𝐢𝐥𝐲 𝐨𝐩𝐞𝐫𝐚𝐭𝐢𝐨𝐧𝐬. 🔷 Magento / Adobe Commerce - custom modules, ERP and payment integrations, migrations, performance tuning on high-traffic stores for real merchants. 🔷 Solution Architecture - system design, technical discovery, realistic estimates for complex, business-critical applications. 🔷 Legacy Rescue & Modernization - inherited codebases, half-built products, projects abandoned by the last developer. I reverse-engineer what's there, decide what to keep versus rebuild, and get it to production. My background spans Telco, Utilities, Social Insurance and Government - high-stakes environments where software is mission-critical and code has to stay reliable, secure and maintainable for years. That's the standard I bring to SaaS work, whether it's a first MVP or a platform at scale. 𝐓𝐞𝐜𝐡 𝐈 𝐰𝐨𝐫𝐤 𝐰𝐢𝐭𝐡: Python, JavaScript, TypeScript, Node.js, React, Next.js, FastAPI, Java, C#, Go, PHP, Magento 2, PostgreSQL, MySQL, Redis, Elasticsearch, REST API, GraphQL, microservices, Docker, Kubernetes, AWS, GCP, OpenAI API, LLM, machine learning, SaaS, MVP. 𝐈𝐟 𝐲𝐨𝐮𝐫 𝐒𝐚𝐚𝐒 𝐩𝐫𝐨𝐣𝐞𝐜𝐭 𝐢𝐬 𝐭𝐞𝐜𝐡𝐧𝐢𝐜𝐚𝐥𝐥𝐲 𝐜𝐨𝐦𝐩𝐥𝐞𝐱, 𝐛𝐞𝐡𝐢𝐧𝐝 𝐬𝐜𝐡𝐞𝐝𝐮𝐥𝐞, 𝐨𝐫 𝐬𝐭𝐮𝐜𝐤 - 𝐭𝐡𝐚𝐭'𝐬 𝐞𝐱𝐚𝐜𝐭𝐥𝐲 𝐰𝐡𝐞𝐫𝐞 𝐈 𝐝𝐨 𝐦𝐲 𝐛𝐞𝐬𝐭 𝐰𝐨𝐫𝐤. Send me a message and let's talk!

I'm a Senior Full-Stack Engineer, Solution Architect, and Technical Lead with 10+ years of experience building scalable products, high-performance backend systems, AI-powered applications, and cloud-native platforms. I've led engineering teams, architected enterprise applications from scratch, and delivered production systems used by financial institutions, NBFCs, SaaS companies, and travel businesses. I enjoy solving complex engineering problems—whether it's designing distributed systems, optimizing databases, building AI agents, or developing modern web and mobile applications. My expertise spans the entire product lifecycle, from architecture and backend development to frontend, cloud infrastructure, DevOps, and AI integration. What I work with • Backend: Node.js, NestJS, Express, PHP (Laravel), Java, REST APIs, GraphQL • Frontend: React, Angular, TypeScript, JavaScript • Mobile: React Native, Android (Java/Kotlin) • Databases: PostgreSQL, ClickHouse, MySQL, Redis, MongoDB • Cloud & DevOps: AWS, GCP, Docker, Kubernetes, Nginx, CI/CD, Linux • AI & Automation: OpenAI, LangChain, LangGraph, AI Agents, RAG, Machine Learning integrations, NLP • Data Engineering: ETL pipelines, analytics platforms, reporting systems, real-time data processing Industry Experience • FinTech & Lending Platforms • Banking & NBFC Solutions • Travel & Flight Booking Systems • SaaS Products • Business Intelligence & Analytics • Enterprise Workflow Automation One of the products I architected and continue to lead is ByteLoom, an enterprise analytics and business intelligence platform used by lending organizations to manage reporting, dashboards, data pipelines, and operational insights at scale. I believe great software starts with good architecture. Rather than simply writing code, I help businesses choose the right technologies, design scalable systems, and build products that are maintainable for years. Whether you need to build a product from scratch, modernize an existing application, optimize performance, integrate AI, or scale your infrastructure, I can help. Core Expertise ✔ Full-Stack Development ✔ System Architecture ✔ API Development ✔ AI Agents & LLM Integration ✔ Machine Learning Integration ✔ Cloud Architecture (AWS & GCP) ✔ Database Design & Optimization ✔ Performance Tuning ✔ DevOps & CI/CD ✔ Enterprise SaaS Development ✔ Mobile Application Development ✔ Business Intelligence & Data Engineering I'm passionate about building reliable, scalable software that solves real business problems—not just delivering code.

I don’t just 'build themes, I architect solutions. My expertise spans from Shopify Plus Checkout Extensibility and Custom App development to building blazingly fast Headless storefronts using Hydrogen and Next.js. Why clients choose me: Performance: I consistently deliver Google PageSpeed scores of 80+ by refactoring Liquid code and optimizing assets. Complexity: I specialize in overcoming Shopify’s native limitations (like the 100-variant limit) and building complex product logic. Fullstack Power: Proficient in React, Next.js, and Node.js, allowing me to build robust integrations that typical theme developers can't handle. Whether you're migrating from Magento/WooCommerce or need a custom Shopify Function, I ensure clean, maintainable code that drives ROI. Let’s discuss how I can elevate your store.

Hi, I'm Kenil. I'm a Full Stack Developer and Product Engineer with 13+ years of experience building custom software, SaaS products and AI powered solutions for businesses across Manufacturing, E commerce, FinTech, EdTech, Hospitality and HR. I started my career as a PHP developer in 2013 and have spent the last decade helping businesses replace manual processes with software that's faster, more reliable, and built to scale. Before starting my independent practice, I worked at BDO India, where I developed tax and compliance automation systems that required precision, security, and performance. Today, I work directly with founders, startups, and established businesses to build products that solve real operational challenges. Whether it's an ERP system, a Shopify application, an inventory platform, a custom SaaS product, AI automation, or a complex system integration, I focus on understanding how your business works before deciding how the software should work. I believe great software isn't about adding more features—it's about removing friction. Every solution I build is designed to automate repetitive work, simplify operations, and support long-term business growth. My technical expertise includes Shopify, React, NestJS, Laravel, WordPress, AI integrations, cloud infrastructure, and custom API development. From planning and architecture to development, deployment, and ongoing improvements, you'll work directly with me throughout the entire project. If you're looking for someone who combines product thinking, strong engineering experience, and a practical approach to solving business problems, I'd love to help bring your idea to life.

Senior Full Stack Developer, 10+ years, now Head of Engineering for a HIPAA telehealth platform serving 100,000+ patients. I build SaaS products and MVPs end to end with Next.js, NestJS, PostgreSQL and AWS. 7,700+ hours, $300K+ earned, 100% Job Success. I also ship AI features that survive real users, not just demos: LLM agents, voice AI, and AI image and video pipelines. 48 jobs, Top Rated Plus, AWS Certified (Developer + Solutions Architect). Most clients call me Nelson. WHAT I GET BROUGHT IN FOR 1. SaaS and MVP builds: idea to production, one person owning frontend, backend, database and deployment. 2. Backend systems: NestJS and Node.js APIs, auth and permissions, background jobs, queues, webhooks, third-party integrations. 3. AI product work: LLM features, agents, AI image and video pipelines, voice AI, shipped inside real products with real users. 4. Rescue work: slow queries, breaking deploys, unreliable jobs, and codebases that need to ship again. WORK THAT SHOWS THE LEVEL (all three are Upwork contracts, 5 stars; full case studies in my portfolio below) 1. SceneWeaver: Founding Engineer, empty repo to closed beta used by filmmakers and educators in 30+ countries. Built the script-to-storyboard-to-video AI workflow, async media pipelines, and the AWS infrastructure. $60K+ over 1,556 hours. 2. Novi: HIPAA telehealth for GLP-1 care, now supporting 100,000+ patients. Built it with Next.js and NestJS, PHI handling on AWS, Stripe subscriptions, and integrations with three provider networks. The client brought me back as Head of Engineering, where I am today. 3. Press Play: national dance convention platform running across 20+ cities in the US and Canada. Next.js, Node.js, Prisma, Stripe, AWS. 972 hours, $48,600, completed February 2026. HOW I WORK I ask what the highest-risk piece is before I write any code, and I tell you when something should be cut for v1. You get code your next developer can read, short written updates, and no surprise rewrite six months later. Based in Ho Chi Minh City (ICT). I keep hours that overlap the US working day and I reply the same day, every day. STACK Next.js 15, React 19, TypeScript, Tailwind CSS, shadcn/ui NestJS, Node.js, Express, Python, FastAPI, Django PostgreSQL, Prisma, Drizzle, Redis, BullMQ AWS (Certified), Vercel, Supabase, Neon, Docker, GitHub Actions Stripe, Paddle, Supabase Auth, Firebase Auth OpenAI, LangChain, LangGraph, Vercel AI SDK, Replicate, ElevenLabs CERTIFICATIONS AWS Certified Solutions Architect - Associate AWS Certified Developer - Associate Upwork Skill Certification - React Front-End Development If you are starting a SaaS build, restarting a stalled one, or your backend is the thing holding the product back, send me the details and I will tell you what I would build first and what I would cut. A short chat is the fastest way to start.

Most AI features die at the first billing cycle. Mine ship with a hard monthly spend cap per customer and fall back to templates when the cap is hit. I build production systems end to end - database, API, frontend, deploy - and then keep them running. The work I get called in for usually comes down to one of two things: AI that has to behave itself inside a real system, or money that has to move exactly once. Three of my systems are live right now, and all three are in my portfolio below. DUEFLO - my own SaaS. I built it, I run it, and I'm on call for it. It connects to a company's QuickBooks over OAuth, syncs every overdue invoice, and runs a six-step email and SMS sequence over 45 days, escalating from friendly to final notice. The first two steps are templated; the rest are written by Claude with the full engagement history as context, under a hard monthly spend cap per organisation - once the cap is hit it falls back to templates instead of running up a bill. Replies are classified automatically and pause the sequence. An invoice closes itself when the QuickBooks balance hits zero. The hard part was never sending the same message twice. That took an idempotency key at the delivery provider, a unique database index on (sequence, step, channel), and crash recovery that advances the sequence rather than retrying it - plus a distributed lock and a 24-hour cooldown, so a customer with six overdue invoices gets at most one message a day. NORDFIORD - an ecommerce platform I built for a supplements brand, in production for about a year. Next.js storefront, React admin panel, NestJS API. Stock is never decremented at the checkout page - only once Stripe's webhook confirms payment, inside a transaction holding a row-level lock on the item. Two people buying the last unit in the same second cannot both succeed, and the webhook stays correct when Stripe redelivers it, because providers retry. GOODWELL - a React Native ordering app for an appliance retailer, live on the App Store. 41 screens, two roles in one app with separate navigation, carts and permissions, because one of those roles handles money. WHAT I'M BEST AT AI inside real systems - spend caps per tenant, template fallback, classification that drives state changes, generation running in background jobs. Not chat wrappers. Stripe - Checkout, subscriptions, webhook correctness, checkouts that can't oversell. Full-stack SaaS - multi-tenant schema, OAuth integrations, billing tiers, background jobs, deploy pipeline. Third-party APIs - QuickBooks OAuth, signature-verified webhooks, sync jobs that survive refunds and retries. STACK Frontend: TypeScript, Next.js 15, React 19, TanStack Query, Tailwind, shadcn/ui Backend: Node, NestJS, Express, tRPC, Trigger.dev Data: PostgreSQL, Prisma, Drizzle, Redis, MongoDB Payments and AI: Stripe, Anthropic Claude API, QuickBooks Mobile: React Native, Expo Infrastructure: Docker, GitHub Actions, Nginx, Vercel, Cloudflare HOW I WORK 1. Fixed price for defined work. One number, one delivery date - not a running meter. If scope changes, we agree a new number before anything gets built. For ongoing work and long-term roles, hourly is fine; I just want the first piece to be something concrete we can both point at. 2. The first milestone is small. One concrete deliverable in days, not months. If it isn't what we agreed, you don't pay for it and we stop. Nothing to unwind. 3. You own everything from day one. Code in your repository, deployed to your infrastructure, with your keys. No lock-in. 4. I answer within a day, including the awkward messages. Most problems on a project are communication problems that were left for a week. I'm in UTC+5 - a full working day of overlap with Europe, the Gulf and India, and early-morning overlap with US Eastern. Tell me what you're trying to ship and by when. You'll get a fixed price, a date, and an honest read on whether I'm the right person for it. If you would rather start smaller, I also offer a 30-minute consultation with a written estimate afterwards.