Product EngineeringFeatured
Mess360
A multi-mess SaaS for Bangladeshi messes: daily meals, bazar, deposits and an automatic month-end meal rate and settlement that every member can see.
- Java 17
- Spring Boot
- Spring Security
- PostgreSQL
- +6 more
Available for select engagements
Farhan Tanvir
Software Architect, Full-Stack Engineer and Technical Leader
I design and deliver enterprise software that stays clear under pressure: well-modelled data, explicit boundaries, and systems a team can still reason about three years later.
- Focus
- Architecture
- Stack
- Full-Stack
Core technologies and capabilities
- Java 17
- Spring Boot 3
- Angular
- TypeScript
- PostgreSQL
- Redis
- Docker
- Nginx
- REST APIs
- CI/CD
Selected work
Systems built to stay changeable
Each case study describes the problem, the design decisions and the measurable outcome — without publishing confidential client detail.
Platform ServicesFeatured
BanglaEmail
An email platform built around deliverability and correct handling of Bangla-language content across the full send and receive path.
- Java 17
- Spring Boot
- PostgreSQL
- Redis
- +2 more
Enterprise ModernizationFeatured
Academic ERP
Re-architecting a long-running academic ERP into a modular, well-bounded platform that institutional teams can extend without regression.
- Java 17
- Spring Boot
- Spring Data JPA
- PostgreSQL
- +3 more
Services
How I can help
Engagements range from a focused architecture review to complete product delivery.
System Architecture
Domain modelling, service boundaries and data design for systems that need to stay changeable for years.
Learn moreFull-Stack Product Development
End-to-end delivery from data model to deployed application, built by one person who holds the whole picture.
Learn morePlatform Modernization
Staged modernisation of systems that have to keep running every day while they change underneath.
Learn moreTechnical Leadership and Architecture Review
Independent review of an architecture, codebase or delivery approach, with findings ranked by consequence.
Learn morePerformance Optimization
Measured performance work: find where the time actually goes, fix that, and verify the change.
Learn moreEnterprise Integration
Connecting systems that were never designed to talk to each other, with failure handled as a normal case.
Learn more
Approach
Principles I build on
Technical leadership is mostly about removing ambiguity — making the target state explicit and keeping the loop between a decision and its evidence short.
More about me- Clarity
- A design is finished when the next engineer can predict how it behaves without reading every line.
- Ownership
- The person who ships a change owns its behaviour in production, not just its merge.
- Resilience
- Assume dependencies fail. Design timeouts, fallbacks and recovery before the incident, not during it.
- Quality
- Constraints in the database, validation at the boundary, and tests that would actually fail if the logic broke.
- Accountability
- Decisions are written down with their trade-offs so they can be revisited on evidence rather than memory.
Writing
Latest articles
Notes on architecture, data modelling, caching and the engineering practice around them.
Redis and Performance7 min read
Cache Invalidation Is a Write-Path Problem
Most stale-cache bugs are not caching bugs. They are write paths that forgot they had readers. Here is how to make invalidation structural instead of remembered.
- Caching
- Architecture
- Performance
PostgreSQL8 min read
Put Your Invariants in the Database
Application-layer validation protects the request path you thought of. Database constraints protect every path, including the import script written at 2am eighteen months from now.
- Migrations
- Data Modelling
- PostgreSQL
Software Architecture9 min read
Designing REST Contracts That Survive Change
A versioned base path is not a versioning strategy. What actually determines whether an API can evolve is the shape of its responses and the discipline of never widening a promise you cannot keep.
- Architecture
- Spring Boot
Beyond the work
Tours and professional meetings
Time away from screens, and time with other practitioners.
Get in touch
Have a system that needs to hold up?
Tell me about the problem, the constraints and what success looks like. Inquiries are typically answered within two business days.