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Chapter 00 — Origin

First client on
Fiverr in 2020.
After that I just kept saying Yes.

I built his Django app in two weeks. They left a five-star review. The next client came. Then the next. Somewhere around project forty, I stopped counting and started a company with my friend — Yestoideas.

I'm Papan — a full-stack developer and founder from West Bengal who builds for people in United States, Singapore, Italy, Canada, Russia etc.. Eighty products across compliance, fintech, edtech, and AI. The work ranges from real-time messaging systems handling 100K concurrent users to LLM pipelines serving thousands of students daily. The constant: I take the problem seriously, ship fast, and stay until it works.

Founder Staff Engineer Full Stack Developer IST +0530
Papan Sarkar
Papan Sarkar
Kolkata, India — building for the world
5+
Years shipping
80+
Products built
10+
Industries
Chapter 01 — How a name becomes a company
"Someone in Portugal needed a dashboard. Someone in Singapore needed a marketing platform.
I kept saying yes to ideas.
So I named my company Yestoideas."

Every project taught me a new industry, a new culture, a new way to think about problems. Compliance for US trucking companies. AI pipelines for Indian students. Voice orchestration for sales teams. Eighty products later, the pattern is clear — every yes opened a door I didn't know existed.

Chapter 02 — Professional DNA

My brain is wired for Python.
My hands are fluent in everything else.

I thrive in the back-end heavy world — the complex architectures, real-time systems, and infrastructure nobody sees but everyone depends on.

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Core Languages
Python, JavaScript (ES6+), TypeScript — the languages I think in.
PythonJavaScriptTypeScript
⚡
The Powerhouse
Django for the heavy lifting. Node.js + Express for the speed. The MERN stack when the project demands it.
DjangoNode.jsExpressMERN
◎
Real-time & Scale
WebSockets, Celery, microservices, API design — the infrastructure that handles 100K+ concurrent operations.
WebSocketsCeleryMicroservicesREST
☁
Cloud & Infra
AWS (EC2, S3, RDS), Firebase, Docker, GitHub Actions — secure system design from day one.
AWSFirebaseDockerCI/CD
◻
Frontend Precision
React.js, Next.js, Vue.js — tailored with modern UI frameworks, performance-first rendering.
ReactNext.jsVue.jsTailwind
New frontier
AI
AI-Native
LangGraph, RAG, AI voice orchestration (ElevenLabs), context-aware LLM pipelines — I build tools around AI, not just with it.
LangGraphRAGLLMElevenLabs
Chapter 03 — Battle-tested

Systems I've architected
for high-stakes industries.

Every project here involved real users, real deadlines, and real consequences. No toy apps.

Logistics · Compliance
FleetDrive 360
Lead Architect
Designed the full architecture for DOT/FMCSA compliance at scale — driver qualification files, automated alerts, real-time dashboards for US trucking companies.
DjangoReactAWSPostgreSQL
AI · Voice
Pitchline.ai
Technical Consultant
Built an AI-native voice orchestration platform using ElevenLabs — architectural direction across backend, frontend, and infrastructure for sales teams.
DjangoReactElevenLabsSystem Design
EdTech · AI
GyanBeej
Backend Engineer
Built the entire AI learning platform from scratch — context-aware LLM pipelines serving thousands of NCERT/CBSE students daily with Django + MongoDB.
DjangoMongoDBLLM APIsReact
SaaS · Communication
Total Recall
Development Manager
Architected a mass-messaging platform handling 100K+ concurrent messages under 1-second latency. Where I learned scalability is about people and servers.
Django RESTCeleryAWSDocker
See the full portfolio
Career

Experience

From freelancing on Fiverr to leading engineering teams — a track record of shipping at every level.

Oct 2024 – Present
Gyanbeej
Backend Engineer · Django, AI · Remote
Built the entire backend from scratch using Django + MongoDB, enabling scalable AI-driven question-answering for students. Developed context-aware API workflows and optimized data pipelines for high-performance AI interactions.
DjangoMongoDBLLMFastAPI
Feb 2022 – Present
Yestoideas
Co-Founder & Development Manager · Kolkata
Co-founded and scaled a web development agency delivering 30+ production-grade applications across SaaS, compliance, and analytics. Led a 5-member team with 95% client satisfaction. Architected multi-tenant backend systems with Django, PostgreSQL, Redis, and Celery.
DjangoPostgreSQLRedisCeleryTeam Lead
Sep 2025 – Dec 2025
Pitchline
Technical Consultant · Full Stack, AI Voice Agent · Remote
Provided technical guidance and architectural direction across backend, frontend, and infrastructure. Resolved blockers related to APIs, database structuring, deployments, and performance — aligned technical decisions with product goals.
DjangoReactSystem DesignAI Voice
Jun 2023 – Apr 2024
Total Recall (USA)
Development Manager · Remote
Directed full lifecycle of a mass-messaging SaaS platform for global emergency communication. Architected backend with Django REST + Celery supporting 100K+ concurrent messages under 1-second latency. Managed sprint delivery and deployment pipelines with AWS, Docker, and GitHub Actions.
Django RESTCeleryAWSDocker
Feb 2019 – Jan 2024
Fiverr (Freelance)
Full Stack Developer · Level-2 Seller
Delivered 60+ projects with 5-star ratings across SaaS, e-commerce, dashboards, and automation tools. Specialized in Django/React systems with REST API integrations and responsive design.
DjangoReactREST APIs60+ Projects
Jun 2021 – Oct 2021
Preflet (Portugal)
Frontend Developer · Remote
Collaborated with international teams to implement React-based frontends for SaaS dashboards. Optimized component rendering and API integration for improved UI performance and scalability.
ReactSaaSAPI Integration
Jan 2021 – Apr 2021
Pikkal (Singapore)
Full Stack Developer · Remote
Enhanced the company's marketing platform using Django and Vue.js. Focused on brand consistency, campaign automation, and data visualization modules.
DjangoVue.jsMarketing Tech
Chapter 04 — Engineering philosophy

How I think about
building things.

Not principles I recite. Principles I ship by.

01
Shipping beats overthinking.
A solid MVP in production teaches you more than a perfect spec in a Google Doc. I get products in front of users fast — then iterate based on reality, not assumptions.
02
Simplicity beats complexity.
If the architecture needs a whiteboard to explain, it needs a rewrite. Clean code isn't a luxury — it's how you survive the next 10 feature requests.
03
Security isn't a feature. It's the foundation.
From SaaS design to real-time apps, I prioritize secure, scalable, and optimized codebases. Not as an afterthought. From commit #1.
04
Expert-only execution.
I lead a team, not just an agency. At Yestoideas, every engineer is senior-level. I value deep expertise over generalist hacking and quality over speed.
05
Great products come from understanding users.
Not from understanding frameworks. Every feature I build is tied to a real-world use case. Every decision balances speed, scalability, and actual human value.
Chapter 05 — The road so far

Every chapter taught me something
no textbook could.

From a small town in West Bengal to architecting systems for global clients — here's how the story unfolded.

2017
The spark ignites
Enrolled in a Diploma in CS at Bipradas Pal Chowdhury Institute. Wrote my first real program. Realized I'd rather debug code than do anything else on earth. The path was set.
2019
Shipped my first client project
Signed up on Fiverr with nothing but ambition and a Django tutorial I'd just finished. Landed my first client within a week. Over the next years, I'd deliver 60+ projects and earn a reputation for shipping fast without cutting corners.
2020
Leveled up — formally
Started B.Tech in CS&E at St. Mary Technical Campus, Kolkata. Balanced university lectures with midnight deployments. Picked up React, cloud architecture, and the art of managing client expectations across six time zones.
2021
Went international
Joined Pikkal (Singapore) and Preflet (Portugal) — first international team roles. Built marketing platforms with Django + Vue.js. Learned that great remote collaboration is a skill in itself.
2022
Founded Yestoideas
Co-founded a web development agency born from one belief: startups deserve enterprise-grade engineering. Grew to a 5-member team, shipped 30+ production applications, maintained 95% client satisfaction. Still running it.
2023
Scaled to 100K concurrent
Development Manager at Total Recall (USA). Architected a mass-messaging SaaS that handled 100K+ concurrent messages under 1-second latency. This is where I learned: real scalability is about people and servers.
2024
Built AI from scratch
Backend Engineer at GyanBeej — designed context-aware LLM pipelines now serving thousands of students daily. Consulting for Pitchline on AI voice orchestration. Deeply invested in LangGraph and RAG.
Now
The next chapter
Deeper into AI-native products, automation with N8N, and building Mandarin-Boost — a language learning ecosystem with PostgreSQL + Neo4j. Always open to collaborations that challenge me to grow.
Chapter 06 — Beyond the screen

Not everything I care about
has a deploy button.

"

Cricket has always been first priority. Before code, before clients, before everything — there was cricket. I grew up an introvert, and it was cricket that changed that. Most of my closest friends today, I made on the field. It pulled me out of my shell and taught me how to connect with people.

It's still the thing I make time for no matter how busy work gets.

When I'm not at my terminal, you'll also find me on two wheels — navigating 1,500km circuits through North India on my KTM 390 Adventure X. The mountains teach the same thing the pitch does: read the conditions, stay calm, commit to the shot.

Off the clock
🏏
Cricket
Since childhood — never stopped
🏍️
KTM 390 Adventure X
Long-distance touring
🏔️
North India
1,500km circuits
🧪
Experimenting
New ideas, always
Languages I speak
🇮🇳 Bengali · Native
🇬🇧 English · Fluent
🇮🇳 Hindi · Fluent
Based in
Kolkata, West Bengal, India IST +0530
Building remotely for clients across US, Europe & Asia.
Verified
Don't take my word for it.
Rated and reviewed on the platforms that matter.
Fi
Level One Seller
★★★★★ 4.9
Up
Top Rated Seller
★★★★★ 5.0

From concept to deployment

Let's build something
meaningful.

I'm open to SaaS contracts, AI consulting, technical leadership, and product collaborations. If you've read this far, we probably think alike.

Drop me a line → WhatsApp me
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