Hey, I'm Debayan Das

Software Engineer

Flutter appsTypeScript APIsGCP · AWSBigQuery

I build TypeScript backends and cloud infrastructure on GCP and AWS, then ship the Flutter apps that run on top.

Now
Breakthrough Apps → TypeScript backend, GCP & AWS infrastructure, Flutter apps
Looking for
Open to backend, cloud, and full-stack engineering roles. Selective on early-stage projects.

See my work Reach out Résumé PDF

Selected projects

Reva Native iOS app for compulsive phone use
01

Reva

Native iOS app for compulsive phone use

Swift · SwiftUI · SwiftData · Screen Time API

Shipped to iPhone and iPad in 31 languages, with subscriptions through RevenueCat and StoreKit 2.

  • Built solo in Swift and SwiftUI for RevenueCat Shipaton 2026, and live on the App Store since September 2026.
  • Blocks apps through Apple's Screen Time API, with shield and activity-monitor extensions sharing an App Group.
  • Times how fast each pause gets dismissed, per app, and raises that app's block level once its pause stops working.
  • App tokens are SHA-256 hashed before they reach SwiftData. The optional backup is sealed on device with ChaChaPoly, so Firestore only ever holds ciphertext.

Swift, SwiftUI, SwiftData, Screen Time API, CryptoKit, RevenueCat, Firebase, XCUITest

App Store ↗

Lacia Autonomous SRE Agent
02

Lacia

Autonomous SRE Agent

Next.js · Go · Node.js · Docker

Autonomous debugging: production error to tested, mergeable PR.

  • Self-hosted agent that watches production logs, reproduces crashes in a sandbox, and opens tested pull requests end to end, without a human in the loop.
  • Control plane in Next.js. A Go-based Watcher CLI streams stack traces via webhooks.
  • Google Gemini handles root cause analysis through structured tool calls.
  • Sandboxed test execution and PR automation via GitHub API.

Next.js, Go, Node.js, Docker, SQLite, Webhooks, GitHub API

Source on GitHub ↗

EverYou Digital legacy platform with AI-driven memory generation
03

EverYou

Digital legacy platform with AI-driven memory generation

Django · GCP Compute Engine · Async Processing · AI API Integration

The backend handles unpredictable AI workloads without blocking user requests.

  • Digital legacy platform running Django on GCP Compute Engine.
  • Async job processing for AI tasks so inference doesn't block user requests.
  • Rate limiting, structured logging, and health monitoring for third-party AI APIs.

Django, GCP Compute Engine, Async Processing, AI API Integration

More on GitHub ↗

Where I've worked

  1. Breakthrough Apps Inc. (current) Software Engineer Aug 2024 — Present
    • Design and maintain ETL pipelines on BigQuery and Cloud Functions that process billing and analytics data from Stripe, RevenueCat, and Firebase.
    • Cut partner onboarding manual work by 50% by replacing it with an infrastructure-automation stack: a Dockerized Express service on AWS, Pulumi-managed GCP provisioning, and scripts for data seeding, PR creation, and third-party integration setup.
    • Built a unified backend for subscription management across App Store, Play Store, Stripe, and RevenueCat.
    • Took crash-free sessions from 66% to 94% through structured logging, monitoring, and better error handling.
    • Replaced recurring ops workflows with Cloud Functions running on a schedule, freeing the team from manual maintenance toil.
    • Ship and maintain Flutter apps across release cycles, taking features from API design to mobile UI.

    New York (Remote) · GCP, BigQuery, Cloud Functions, Express.js, TypeScript, Flutter, SQL, AWS

  2. Pherico App Development Intern Jun 2024 — Aug 2024
    • Built auth and role-based access control with Firebase Auth and Firestore Security Rules.
    • Integrated REST APIs into Flutter apps and contributed to backend services on Cloud Functions.

    Remote · Firebase, Node.js, Flutter, GCP

  3. Horizon Views Freelance Engineer May 2024 — Jul 2024
    • Built a Security Staff Operations Portal for managing field ops, scheduling, and reporting.
    • Solo engineer, from requirements through deployment.

    Remote · Flutter, Firebase, Node.js

  4. Locamart Online Services Fullstack Product Engineer — Intern Jan 2024 — Jul 2024
    • Built a hyperlocal commerce platform from scratch: Django backend, Flutter mobile client, Firebase for the real-time data layer.
    • Designed NoSQL data models for real-time inventory and order processing.
    • Set up CI/CD pipelines and deployment automation.

    Noida, India · Django, Flutter, Firebase, NoSQL, CI/CD

What I reach for

Languages
TypeScript, Dart, Python, SQL, Go
Backend
Node.js / Express.js, PostgreSQL, Firebase, NoSQL
Cloud
GCP (Cloud Functions, Cloud Run, BigQuery, Pub/Sub), AWS (Lambda, S3, RDS), Docker, Pulumi, CI/CD
Mobile
Flutter

How I got here

In 2019, I downloaded an open-source anime streaming app from GitHub. I ended up reading its Kotlin source code and couldn't figure out how text on a screen turned into a working application. That's what got me into programming.

I started where most people start: UIs and mobile apps. But I kept wondering what was behind the screen. How data moved, where it lived, why things broke at scale. That pulled me into backend systems with TypeScript and Node.js, then cloud infrastructure on GCP and AWS.

Right now at Breakthrough Apps, I write TypeScript across the stack: serverless APIs on Cloud Functions, subscription and billing backends, and the Flutter apps that consume them. Shipping both sides changes how you build. You make tradeoffs you'd miss if you only saw one layer.

I use AI tools like Claude Code for the mechanical parts. They make me faster when I already know what I'm building.

Inbox is open.

Backend systems, cloud, or mobile work — happy to talk.

debayancodes@gmail.com

It's 2:28 pm for me in India, probably shipping something.

Or leave a note here.