Sarp Toprak Birben

Amsterdam, NL · backend systems

Sarp Toprak Birben

Backend-focused software engineer — building scalable systems end to end, from design to production.

open to work · backend & systems roles

Built a recommendation engine projected to save users €2.1M/year.

LaravelDistributed SystemsFastAPIEvent-drivenPostgreSQL

~/experience

Software Engineer Intern

Dec 2025 – June 2026

Trein-vertraging · Amsterdam

  • Designed and built a recommendation service in Laravel that analyzes user travel patterns against projected usage to suggest the right plan for each user — projected to save users €2.1M/year and now a core part of the platform's Pro tier.
  • Redesigned the platform's communication system, consolidating scattered logic into a single reliable service with rate-limiting, deduplication, and scheduled sending — eliminating duplicate messages and reducing messaging-related support complaints.
  • Built an end-to-end customer-support integration with AI-driven routing that automatically categorizes queries, lifting automated resolution from 31% to 65% and cutting manual support work.
  • Contributed to the integration of rail data from major operators across nine European countries, building normalization and entity-matching logic that unified real-time and timetable feeds through UIC-based and geospatial station mapping.

~/projects

fuuutball

Online Multiplayer Football Manager

Python · FastAPI · React

  • Real-time multiplayer backend where users join league sessions, manage squads, and trade players on a live transfer market against other players and AI bots — FastAPI + async SQLAlchemy 2.0 (PostgreSQL), with Celery / Redis workers driving match simulation, season progression, and bots.
  • Engineered a deterministic match-simulation engine and a transactional-outbox event pipeline for reliable updates; validated with unit, property, and load tests (k6, Locust).
  • Set up CI/CD with GitHub Actions — automated testing on every change and Dockerized deployments to dev and production.

morethantasks

Full-Stack Productivity App

Swift

  • Designed and built a full-stack app with online/offline data synchronization.
  • Built a dual-database system (PostgreSQL + SQLite) for reliability and scalable local-first storage.

~/skills

Languages
PHPPythonJavaC++
Backend
LaravelFastAPIREST APIsCeleryRedis
Frontend
ReactInertia.jsNext.jsVite.js
Databases
MySQLPostgreSQLSQLiteSQLAlchemy
Tools / DevOps
DockerGitGitHub ActionsCI/CDAlembic
Concepts
System DesignDistributed SystemsScalabilityData Structures & Algorithms

~/contact

Looking to hire or collaborate? Send me a message.