Cognoir
ActiveA horizontal RAG platform that lets non-technical users upload documents, ingest web content, and generate structured outputs — no code required.
Python LangChain FastAPI Claude Voyager RAG
Cofounder · Dooplin Apps S.L.
I'm Sakib. I turn ideas into systems that ship.
Developer and cofounder of Dooplin Apps S.L. I own the technical side of the company — system design, architecture, and product planning — and I build the products myself, end to end.
What I Do
From first sketch to production.
System Design & Architecture
I decide how our software fits together — data models, service boundaries, infrastructure — so products scale without rewrites.
Product Planning
I turn ambitions into roadmaps — scoping what to build, what to cut, and in what order, so every release moves the product forward.
Hands-On Development
I don't just architect — I build. Full-stack web apps, AI/RAG pipelines, browser extensions, and the deployment pipelines behind them.
Dooplin Apps S.L.
We solve problems. Apps are just how we do it.
Dooplin Apps S.L. is a Barcelona-registered software company I cofounded. It's committed to building apps that make a positive contribution to society — with privacy respected at the core, not bolted on afterwards.
As cofounder, I lead everything technical: the architecture behind each product, the systems they run on, and the plans that take them from idea to launch.
In Development
Ride-Hailing for Barcelona
A VTC/taxi app for riders and licensed drivers in Barcelona — iOS and Android, launching soon.
Principle
Privacy as Architecture
Where we can, we build so misuse isn't possible — not just promised. Less data collected is less data to protect.
Portfolio
Built to Last
A focused portfolio spanning social-impact and commercial products — durable engineering we can stand behind in five years.
Products
Things I've built.
Platforms and tools I've designed, architected, and shipped — from AI document platforms to privacy-first browser extensions.
Sitr
In ProgressA halal/family content filter browser extension whose privacy you can verify, not just trust — all filtering happens on your device, with a public blocklist and reproducible builds.
Browser Extension Manifest V3 TypeScript Privacy Open Source
Database Platform
ActiveA turnkey database solution that lets non-technical teams collect, manage, and publish structured data — built for NGOs, businesses, and organizations without dedicated dev resources.
Astro GitHub Actions Google Sheets No-Code
Selected Work
Built with purpose.
Projects built for clients and communities — from multilingual consultancy websites to bilingual research archives.
Asesoría El Faro
ActiveA trilingual website for a Barcelona-based legal and immigration consultancy — serving clients in English, Spanish, and Bengali.
Web Design Multilingual Immigration Client Project
July Archive
In ProgressA bilingual, AI-queryable archive preserving primary source material from the July 2024 revolution in Bangladesh.
Archive AI Bilingual RAG Research
Latest Writing
All posts →
From the Blog
Engineering
The Fundamentals Scratchpad: A Cure for Framework Fuzziness
When your RAG platform grows past 10,000 lines, the basics of FastAPI and LangChain start to feel hazy. Here's the tiny repo that fixes it.
Engineering
What I Learned Deploying a Multi-Service RAG App as a Solo Dev
Eight days, four sprints, one shipped MVP — and everything that went wrong along the way. Lessons on Railway networking, Celery workers, HuggingFace caching, CORS, SSE streaming, and provider abstraction.
Want to talk shop?
Whether it's about Dooplin Apps, something I've built, or an idea you're mulling over — I'm always up for a good conversation.