Lead Software Engineer at The Jacky Winter Group
Jhumur Chatterjee
I build web applications that stay clean as they grow.
Fullstack developer with seven years across Ruby on Rails and React. I currently lead engineering at The Jacky Winter Group, where I build and scale PencilBooth and Cobbler — products used every day by studios and creative agencies. I care about well-modelled data, interfaces that feel effortless, and code the next developer can actually read.
Most of what I write about sits at the boundary between Rails and PostgreSQL: inheritance patterns, multi-database setups, and keeping a large codebase understandable as a team grows.
Selected Projects
Skills
Backend
- Ruby
- Ruby on Rails
- MVC Architecture
- RESTful API Design
- Active Record
- Active Admin
- Background Jobs
- Service Objects
- Domain-Driven Design
Frontend
- JavaScript
- TypeScript
- React
- Next.js
- jQuery
- HTML5
- CSS3
- Tailwind CSS
- Responsive Design
- Accessibility
Databases
- PostgreSQL
- MySQL
- Schema Design
- Indexing Strategies
- Query Optimization
- Multiple Databases
- Read Replicas
- Database Migrations
- Redis
Testing & Quality
- RSpec
- Test-Driven Development
- Unit Testing
- Integration Testing
- FactoryBot
- Code Review
- Refactoring
Tooling & Delivery
- Git
- GitHub
- CI/CD
- Docker
- Linux
- Vercel
- Performance Profiling
- Monitoring
Ways of Working
- Agile
- Scrum
- Technical Leadership
- Mentoring
- Architecture Review
- Documentation
- Cross-team Collaboration
Work Experience
Lead Software Engineer
The Jacky Winter GroupAug 2023 — Present
Software Engineer
Big Binary LLCJun 2021 — Jul 2023
Full Stack Engineer
GKMIT Pvt. Ltd.Nov 2020 — May 2021
Web Engineer
Kreeti Technologies Pvt. Ltd.Jan 2019 — Oct 2020
Education
Bachelor of Technology (B.Tech)
2014 — 2018
Computer Science & Engineering
Netaji Subhash Engineering CollegeKolkata, IndiaGPA 8.5 / 10
Blog
All posts →Organizing Rails Models in Folders with Custom Table Names
9 min read
Scaling Rails Applications with Multiple Databases: A Complete Guide
7 min read
Multiple Table Inheritance Patterns in Ruby on Rails with PostgreSQL
10 min read
Single Table Inheritance in Ruby on Rails with PostgreSQL
6 min read
Service Objects in Rails: Where Business Logic Actually Belongs
7 min read
Connect
Working on something interesting, or want a second pair of eyes on a Rails codebase? I’m always happy to talk.
jhumurchatterjee1996@gmail.com