01
Web apps & SaaS
Dashboards, portals, booking flows and multi-tenant SaaS — responsive React frontends on solid Spring Boot or Node backends.
- React
- Spring Boot
- Node.js
- PostgreSQL
Seen in: VERA · AcreVault
Available for freelance projects
Hi, I’m Aditya — welcome to my lab.
I turn your idea into a product people trust.
KAG Tech Labs is my one-person product lab. I design and build web apps, APIs and AI features end to end — Spring Boot or FastAPI on the back, React on the front — for founders and teams who need it shipped properly.
- 5+products built
- Top 3of 890+ teams · global AI hackathon
- Remotefrom Mumbai · IST
LAB-01Services
What I can build for you.
From a first MVP to the feature your users keep asking for — designed, built and shipped by one accountable developer.
02
AI assistants & automation
Chatbots and voice agents grounded in your own documents, OCR and recommendation features, and Python automation that removes busywork.
- Python
- RAG
- LLMs
- OCR
Seen in: VERA · WLCUS email agent
03
APIs & backend systems
Secure REST APIs with JWT auth, roles and tenant isolation, idempotent processing, and clean data models that hold up as you grow.
- Java
- FastAPI
- JWT
- REST
Seen in: VERA · AcreVault
04
Web3 & smart contracts
Solidity contracts, wallet flows and decentralised storage, wrapped in interfaces that normal users can actually understand.
- Solidity
- Hardhat
- ethers.js
- IPFS
Seen in: AcreVault · MindBloom
- 01
Scope
We agree on the goal, the must-have features, and a realistic timeline before any code is written.
- 02
Build
You follow progress on a live preview link and give feedback while it is still cheap to change things.
- 03
Launch
I deploy, hand over the code and documentation, and stay around to fix what real users find.
LAB-02Selected work
Real builds, booted live.
Pick a project — the laptop loads it and the particles project a hologram of it above.
An AI receptionist any business can train
VERA
A voice-enabled assistant a business trains on its own knowledge, embeds on its website, and uses to capture appointments, leads and support cases.
Answers come from the business’s own documents through a grounded RAG pipeline. Calls run on AssemblyAI’s Voice Agent API with interruption handling, unresolved requests are handed to a person with full context, and questions it couldn’t answer become knowledge gaps that only an owner-approved answer can fill.
Voice + chatone embeddable widget
- Embeddable chat and voice widget for any website
- Action Center for handoffs, cases, call summaries and sentiment
- Tenant-scoped API with an audit trail for every case
- FastAPI
- LangGraph
- Groq
- ChromaDB
- AssemblyAI
- React
- Three.js
More experiments on GitHub ↗ (opens in a new tab)
LAB-03Client work
Real client work, shipped quietly.
WLCUS Kft.
Independent Contract Software Developer
3 Jul 2026 — 27 Aug 2026Freelance · Remote
International B2B events company · Budapest, Hungary · wlcus.com ↗ (opens in a new tab)
Internal tool
Bulk email agent
A Python desktop application for WLCUS’s internal bulk email campaigns, with programmatic delivery through Amazon SES.
- Python
- Desktop app
- Amazon SES
Confidential
Event software & website
Contributed to internal and event-related software and to wlcus.com — from understanding requirements to implementation, testing and debugging. Specifics are under NDA.
- Requirements
- Testing
- Version control
“He worked independently, demonstrated strong technical skills, and successfully delivered the assigned tasks within the agreed timelines.”
LAB-04About
The developer behind the pixels.
A 3D ID card for Aditya Gupta, freelance full-stack developer, hanging on a lanyard.
Freelance full-stack developer working across Java/Spring Boot, React, Python, AI and blockchain.
When you hire me, you work directly with the person writing the code. I take a brief from rough idea to deployed product: data model, APIs, interface, auth, and the AI or blockchain pieces when your project needs them.
Most recently I worked as a contract developer for WLCUS, an international events company, where I built their internal bulk email agent on Python and Amazon SES. Before that I led and shipped products in 24- and 48-hour hackathons — which is where I learned to scope tightly and deliver working software on a deadline.
- products built end to end
- 5+
- hackathon podiums
- 3
- teams in the AI hackathon where I placed 3rd
- 890+
- fastest idea-to-demo build
- 24h
LAB-05Toolkit
The stack behind the builds.
01Languages
- Java
- JavaScript
- Python
- Solidity
- SQL
02Frameworks
- Spring Boot
- React
- FastAPI
- Node.js
- Express.js
- Hardhat
03Data & AI
- PostgreSQL
- MongoDB
- ChromaDB
- Firebase
- LangGraph
- OpenCV
04Tools
- Git
- GitHub
- REST APIs
- Postman
- Amazon SES
- JWT
LAB-06Track record
Built under pressure. Proven on stage.
Hackathons are where I learned to scope ruthlessly and ship working software against a clock.
3rd globally
Trae AI IDE: Zero Limits Hackathon
890+ teams · 9,000+ participants · 48-hour AI hackathon
1st place
GENISIS 2026
24-hour hackathon
2nd place
Invictus 2025
24-hour hackathon
LAB-07Start a project
Have an idea? Let’s build it.
Tell me what you’re building, your timeline, and what a great result looks like. I reply within two working days.