01Web
Full stack web apps
From idea to working product with React, Next.js and Node.js.
- Responsive UIs in Tailwind CSS
- REST & GraphQL integration
- Admin dashboards
- MongoDB / PostgreSQL design
Available for freelance projects · Free consultation →Full stack · AI integration · Cloud deployment
I design, build and ship fast, scalable web and mobile products — and build AI into them, from chatbots to agents.
Kolkata, INIST (UTC+5:30)
- ~5 years
- Shipping production code for real products
- Web & mobile
- React, Next.js and React Native front ends
- APIs
- NestJS, Express, GraphQL, REST and WebSockets
- AI built in
- Chatbots, agents, RAG search and AI workflows
Core stack: React, Next.js, React Native, Node.js, NestJS, GraphQL, TypeScript, AI agents, Chatbots, RAG search, MongoDB, PostgreSQL, Redis, Docker, Kubernetes, AWS.
(01) About
I'm a full stack developer with nearly five years of shipping production code — real-time APIs in NestJS and GraphQL, data models in MongoDB and PostgreSQL, and responsive interfaces in React, Next.js and React Native — plus AI integration: chatbots, agents, RAG search and AI workflows, shipped to production cloud and monitored once live.
- Currently
- Web Developer at Symlink Technologies, since May 2023
- Education
- MCA, Brainware University
- Languages
- English, Bengali, Hindi
- Works
- Remotely, with clients anywhere
(02) Services
How I can help your product
Message me before ordering — we'll scope the work together so you know exactly what you're getting.
02Mobile
Cross-platform mobile apps
One React Native codebase for iOS, Android, phones and tablets.
- Phone & tablet layouts
- API & real-time integration
- Reusable UI components
- Testing before handover
03Backend
Backends & APIs
NestJS or Express services that are typed, fast and maintainable.
- REST & GraphQL APIs
- Real-time with WebSockets
- Redis caching
- Docker-ready services
04AI
AI integration
Chatbots, agents, RAG search and AI workflows built into your product.
- Chatbots & AI agents
- RAG & semantic search
- Content & multi-modal APIs
- Guardrails & cost control
- Step 01
Discuss
We talk through your goals, scope and timeline.
- Step 02
Plan
Clear milestones and the stack that fits the job.
- Step 03
Build
Clean TypeScript, with regular progress updates.
- Step 04
Deliver
Tested and handed over, ready to launch.
(03) Free consultation
Start with a free consultation
Not sure what you need yet? Pick one of six free ways to start. No cost and no obligation — you keep the advice whether we work together or not.
- 100% free
- No obligation
- You keep the plan
- Your code stays private
30 min · Video callFree · No obligation
Discovery call
You have an idea and want a straight answer on how to build it — what it takes, what to build first and what to skip.
How it worksPick a time
Send a short note about your idea with a few times that suit you. I work from Kolkata (IST) and keep flexible hours for other time zones.
Talk it through
We go over your goals, users, must-have features, budget range and deadlines.
Get a clear direction
I recommend a tech stack, a lean first version and point out the main risks.
Decide, no pressure
You get a written summary. Build it with me, with someone else, or not at all.
- Recommended tech stack
- MVP feature list
- Key risks and unknowns
- Written call summary
Written scope & cost rangeFree · No obligation
Project estimate
Already know what you want? Send me the brief and get a written breakdown you can plan and budget around.
How it worksShare your brief
A document, Figma file, rough notes or a few paragraphs — whatever you have.
Quick follow-ups
I ask the questions that change the price, so nothing is guessed.
Receive the estimate
Milestones, a realistic timeline and a cost range, with every assumption written down.
Walk through it
Optional call to go over the numbers and adjust the scope together.
- Milestone breakdown
- Realistic timeline
- Cost range
- List of assumptions
Async review · Written reportFree · No obligation
Code & app audit
Your app is live or in progress, but something feels slow, fragile or messy. Get an honest outside review.
How it worksShare access
Read-only access to your repository, or just the live URL for a front-end and performance review.
I review it
Architecture, performance, error handling and security basics across front end and API.
Get ranked findings
Issues sorted by impact, split into quick wins and bigger fixes.
Optional walkthrough
A short call to explain the findings and answer your team’s questions.
- Top issues ranked by impact
- Quick wins for this week
- Performance and security notes
- Effort estimate per fix
45 min · Call + notesFree · No obligation
AI integration check
Wondering where AI actually helps your product? Find the use cases worth building — and the ones that aren’t.
How it worksTell me about your product
What it does, who uses it and what data you already have.
Map the use cases
Chatbots, RAG search over your documents, agents or automated content workflows.
Check feasibility
Data readiness, model choice, running cost per user, privacy and guardrails.
Plan a proof of concept
A small, low-risk first build to prove the value before you commit.
- Ranked AI use cases
- Rough running-cost estimate
- Data and privacy checklist
- Proof-of-concept plan
30 min · Call + checklistFree · No obligation
Hosting & DevOps review
Paying too much for hosting, deploying by hand or finding out about crashes from your users? Let’s fix that.
How it worksShare your setup
Where the app runs, what you pay and how you deploy today.
Review the gaps
Reliability, monthly cost, backups, monitoring and alerting.
Pick the right fit
I recommend a Lean, Control or Scale setup for your traffic and budget.
Get a migration checklist
Clear steps to move — do it yourself or have me handle it.
- Cost-saving opportunities
- Monitoring and alerting gaps
- Recommended hosting setup
- Step-by-step migration checklist
Async · Diagnosis & fix planFree · No obligation
Bug triage
Stuck on a bug that keeps coming back? Send it over and get a diagnosis and a plan to fix it for good.
How it worksSend the details
The error message, logs, steps to reproduce or a quick screen recording.
I reproduce it
I trace the problem to its root cause, not just the symptom.
Get the diagnosis
What is broken, why it happens and how to fix it, with an effort estimate.
Fix it your way
Fix it in-house with the plan, or hire me to fix it and add a test so it can’t return.
- Root-cause diagnosis
- Step-by-step fix plan
- Effort estimate
- Prevention tips
(04) AI integration
Apps that understand, search and act
As an AI integration developer on the MERN stack, I bridge the gap between your data, AI models and the app your users actually touch.
Conversational systems
01Context-aware chatbots
Bots that understand intent and remember the conversation, for support and internal workflows.
AI agents
Agents that act on a plain-language request — query data, draft an email, update a ticket.
Search & retrieval (RAG)
02Vector search
RAG with MongoDB Atlas Vector Search — ask your documents questions in plain language.
Semantic recommendations
Product and content suggestions matched on meaning, not just tags.
Data processing APIs
03Automated content workflows
Summarise PDFs, extract names, dates and prices, translate text — automatically.
Multi-modal processing
Images and voice notes turned into clean, structured data for your app.
AI governance & security
04Guardrails & redaction
Prompt-injection checks and personal-data redaction before anything reaches an AI provider.
Rate limits & cost control
Per-user usage limits that keep AI bills predictable and responses fast.
Where I fit
The layer between your product and the model.
Layer 01
Full stack developer
UI/UX, CRUD operations, database queries and business logic.
Layer 02 · Me
AI integration developer
Connects web apps to AI models, designs smart backend flows and handles data embeddings — on a full stack foundation.
Layer 03
Data scientist / ML engineer
Trains models, tunes algorithms and manages large raw datasets.
(05) Selected work
Products I've built & am building
Featured · Product suite
acharyya.app
One home for everything I build — a blog, a notebook, a task board and a mind-map studio. Four focused apps under one address, all arriving soon.
Visit acharyya.app- Arriving soon
Inkpost
The blog
- Arriving soon
Mnemo
The notebook
- Arriving soon
Tickd
The task board
- Arriving soon
Mindloom
The mind-map studio
(06) Deploy, scale & monitor
Live, fast and kept healthy
I don't hand over code and walk away. I ship your app to production, set it up to scale, and wire in monitoring so problems are caught before your users report them.
Internet / usersRequests over HTTPS
IngressSSL · routes traffic
/ → Frontend serviceReact pods behind Nginx
/api → Backend serviceNode API pods · auto-scaled (HPA)
MongoDB AtlasManaged, outside the cluster
Ship
Packaged to run anywhere
Your app packaged with Docker so it runs the same everywhere, with secrets kept out of the code.
Docker · Nginx · Node-alpine
Scale
Ready for traffic spikes
Runs on managed cloud or Kubernetes that adds capacity during traffic spikes and recovers on its own if a server fails.
Kubernetes · AWS · DigitalOcean · Vercel · MongoDB Atlas
Monitor
Problems caught first
Instant alerts pointing to the exact line that broke, live performance dashboards and automatic restarts if the API crashes.
Sentry · Prometheus · Grafana · OpenTelemetry · PM2
A setup that fits your budget
I'll recommend one on our first callLow maintenance
Lean
Managed platforms with error tracking and cloud dashboards. Least to look after — ideal for MVPs and small business apps.
Vercel · Render · Railway · AWS Lambda
Lowest hosting bill
Control
Your own VPS with process management, error tracking and self-hosted dashboards. Full control at a small monthly cost.
DigitalOcean · Hetzner · AWS EC2 · Linode
Built for growth
Scale
Containers on managed Kubernetes with a dedicated database — high availability and auto-scaling for serious traffic.
AWS EKS · DigitalOcean DOKS · Google GKE
(07) Quality & bug fixing
Tested before launch, fixed for good
Your users shouldn't be the ones finding bugs. Every project gets automated tests before release, and a clear process if something breaks in production.
Test
Unit tests for business logic and API tests for every key route — before anything ships.
Catch
Production errors alert me instantly, with the exact line that failed — usually before anyone reports it.
Diagnose
Stack traces and replayed requests reproduce the issue locally, using anonymised data — no guesswork.
Fix & prevent
Every fix ships with a regression test, and the full suite runs before deploy — so the same bug can't return.
(08) Experience
Where I've worked
- May 2023 — PresentCurrent role
Web Developer
Symlink Technologies LLP, Kolkata
Full stack web and mobile apps with React, Next.js, React Native, NestJS and Express. Schemas in MongoDB and PostgreSQL, Redis caching. Client products include Noam, Faith Life Social and Zuso.
- Mar — Jun 2023
Application Developer (Intern)
Helpy Moto
App features in React Native and JavaScript — UI, API integration and testing.
- Nov 2022 — Apr 2023
Web Developer Trainer
M/S BRITECH
Taught HTML, CSS, JavaScript, React and Node.js through hands-on projects and code reviews.
- Feb — Sep 2022
Software Development Engineer I
Logic Square Technologies
MERN features in an Agile team, with Git-based workflows, code reviews and API integration.
(09) Stack
Tools I ship with every day
Frontend
Backend
Data
Languages
Tools & testing
Cloud & DevOps
(10) ContactGot an idea?
Got an idea?
Let's build it.
Tell me what you're building — a new product, a feature for an existing app, AI integration, or start with a free consultation. I'll reply with next steps.
Emailhello@acharyya.dev
How I work
- Written scope and milestones before any work starts
- NDA signed on request, before you share anything
- You own the code once it's paid for
- Proper invoices, and a bug-fix period after launch
Full details in the Terms of Service and Privacy Policy.