You will get SaaS Architecture Audit — I'll Map Your MVP's Biggest Risks in 48 Hours
Top Rated
Project details
f your MVP works but feels fragile, slow, or impossible to scale — I help turn it into a production-ready SaaS product that can grow safely.
I’m a product-focused full-stack engineer who has built and scaled fintech and SaaS systems used by millions of users and handling real transaction volume daily. Most clients come to me when their MVP is live, has users or pilots, but needs better architecture, performance, and reliability before scaling further.
This project is designed for founders and teams who want a senior engineer who thinks beyond features and focuses on long-term product stability.
What you get:
• Architecture review and scaling strategy
• Refactoring fragile MVP code into maintainable systems
• SaaS features: multi-tenant systems, dashboards, billing, admin tools
• Performance optimization and cost-efficient architecture
• Clean, well-documented code ready for future team growth
I don’t just ship features — I build systems that won’t break when your product grows.
If you're building a serious SaaS or fintech product and want it done right, this is for you.
I’m a product-focused full-stack engineer who has built and scaled fintech and SaaS systems used by millions of users and handling real transaction volume daily. Most clients come to me when their MVP is live, has users or pilots, but needs better architecture, performance, and reliability before scaling further.
This project is designed for founders and teams who want a senior engineer who thinks beyond features and focuses on long-term product stability.
What you get:
• Architecture review and scaling strategy
• Refactoring fragile MVP code into maintainable systems
• SaaS features: multi-tenant systems, dashboards, billing, admin tools
• Performance optimization and cost-efficient architecture
• Clean, well-documented code ready for future team growth
I don’t just ship features — I build systems that won’t break when your product grows.
If you're building a serious SaaS or fintech product and want it done right, this is for you.
Programming Languages
JavaScript, TypeScriptCoding Expertise
Cross Browser & Device Compatibility, Performance OptimizationWhat's included $99
These options are included with the project scope.
$99
- Delivery Time 1 day
- Number of Revisions 1
- Number of Pages 1
- Source Code
Optional add-ons
You can add these on the next page.
Architecture deep dive + written roadmap
(+ 2 Days)
+$120Frequently asked questions
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SH
Spencer H.
Aug 13, 2026
Fullstack Developer & Prompt Engineer Needed
Competent developer with strong agentic coding skills. Good at figuring things out with limited input / instruction.
SH
Spencer H.
Jun 2, 2026
Fullstack Developer & Prompt Engineer Needed
TH
Talia H.
Apr 14, 2026
Expert Setup for Claude Cowork, Replit, and VS Code
Working with Soumik was genuinely one of the best freelancer experiences I've had on Upwork. He delivered a full platform, admin panel, CMS, and several other components at a speed that honestly caught me off guard without sacrificing even a bit of quality.
From day one, he came in with a clear plan, asked the right questions, and executed with zero hand-holding needed. Every milestone was hit ahead of schedule. When I had last-minute changes or additional requests, he handled them smoothly and never made it feel like an inconvenience.
The code is clean, the UI is polished, and everything just works. He communicated proactively throughout — no chasing, no guessing where things stood. That alone puts him in the top 1% of freelancers I've worked with.
If you're looking for someone who gets it done fast, gets it done right, and makes the entire process effortless Soumik is your person. I'll absolutely be coming back for future projects and wouldn't hesitate to recommend him to anyone.
From day one, he came in with a clear plan, asked the right questions, and executed with zero hand-holding needed. Every milestone was hit ahead of schedule. When I had last-minute changes or additional requests, he handled them smoothly and never made it feel like an inconvenience.
The code is clean, the UI is polished, and everything just works. He communicated proactively throughout — no chasing, no guessing where things stood. That alone puts him in the top 1% of freelancers I've worked with.
If you're looking for someone who gets it done fast, gets it done right, and makes the entire process effortless Soumik is your person. I'll absolutely be coming back for future projects and wouldn't hesitate to recommend him to anyone.
DS
Dale S.
Mar 6, 2026
Frontend Developer – Next.js 15 / Supabase (Task-Based, Ongoing)
About Soumik
Senior Full-Stack Developer | AI Agents, RAG, Automation | Next.js
100%
Job Success
Siliguri, India - 5:19 am local time
A lot of that was payments infrastructure, where a mistake costs real money. I've shipped products for Verizon, Ford, and Yahoo, and worked in fintech at Paytm and FamPay (YC S19). Paytm alone processes a double-digit share of India's digital transaction volume. I've handled the risk that comes with that scale.
𝗧𝗼𝗽 𝗥𝗮𝘁𝗲𝗱 on Upwork, 𝟭𝟬𝟬% 𝗝𝗼𝗯 𝗦𝘂𝗰𝗰𝗲𝘀𝘀.
What I actually do:
𝗔𝗜 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝘀 𝘁𝗵𝗮𝘁 𝘀𝘂𝗿𝘃𝗶𝘃𝗲 𝗿𝗲𝗮𝗹 𝘂𝘀𝗲𝗿𝘀. LLM integrations, agents, RAG pipelines, chatbots. I work across the whole range: top-tier APIs from Anthropic (Claude) and OpenAI, or open models fine-tuned and hosted on your own GPUs when cost or data privacy calls for it. Anyone can get these working in a demo. Making them reliable at load is the hard part, and it's the part I've done repeatedly.
𝗕𝘂𝘀𝗶𝗻𝗲𝘀𝘀 𝗽𝗿𝗼𝗰𝗲𝘀𝘀 𝗮𝘂𝘁𝗼𝗺𝗮𝘁𝗶𝗼𝗻 𝘄𝗶𝘁𝗵 𝗔𝗜. Take a workflow your team does by hand, like document processing, support triage, ops reporting, or data entry, and turn it into a system that runs on its own. This is usually where AI pays for itself fastest.
𝗙𝘂𝗹𝗹 𝗦𝗮𝗮𝗦 𝗯𝘂𝗶𝗹𝗱𝘀 𝗮𝗻𝗱 𝗠𝗩𝗣𝘀. React/Next.js frontends, Node or Python backends, PostgreSQL or Supabase, on AWS, GCP, or Vercel. I've taken products from first commit to millions of userss parts: QA, documentation,third-party and partner integrations.
𝗥𝗲𝘀𝗰𝘂𝗲𝘀. If your developer disappeared or left you a codebase you don't trust, I start with an audit: what'sing, what I'd change. You see all of that before I write any code.
𝗛𝗼𝘄 𝗜 𝘄𝗼𝗿𝗸: with you directly, no project manager or handoffs in between. I don't just execute tickets. I'll s about to cost you threemonths, because I've watched those decisions play out at scale.
𝗪𝗵𝗼 𝗜 𝘄𝗼𝗿𝗸 𝘄𝗶𝘁𝗵: founders who want to prototype fast, put it in front of real users, and iterate. If you's on price, I'm probably notyour guy. My clients are usually people who got burned once and want it done right the second time.
Send me two or three sentending. I'll come back with how I'd build it, a rough timeline, and where I'd start. If it looks like a fit, we
jump on a call from there.
Specialties: Full-Stack Devevelopment, Web Development,Web Application Development, Software Development, Software Engineering, SaaS Development, MVP Developmen, Node.js, TypeScript,JavaScript, Python, REST API, API Integration, GraphQL, PostgreSQL, Supabase, MongoDB, AWS, Google Cloud,LM, OpenAI, Claude API, AIAgent Development, RAG, Chatbot Development, AI Automation, Workflow Automation, Fine-Tuning, Open-Source LL, Healthtech, Legaltech,Ecommerce.
Steps for completing your project
After purchasing the project, send requirements so Soumik can start the project.
Delivery time starts when Soumik receives requirements from you.
Soumik works on your project following the steps below.
Revisions may occur after the delivery date.
Pre-call system review
I review your product, architecture or problem before the call so we can go straight into real technical decisions.
Live architecture & scaling consultation
We identify bottlenecks, scaling risks, and technical decisions needed to move forward safely.