About
Ersel Seyit
Backend and distributed systems engineer who also ships the frontend — one person, whole systems.
You need services that stay up and someone who can own them end to end — the Kubernetes underneath, the services on top, the monitoring that catches trouble before your users do, and the interface those users actually see. That is the work I do, solo, from architecture through deployment.
The proof is a telecom operations platform I built and operated alone. This site itself is a live platform showing the architecture deep-dives and running the demos, so you can judge the work instead of taking my word for it.
How we start
- 01
Send a short note
What the system is, where it hurts, and when you need it working. Email or the form — both land in the same inbox.
- 02
A 30-minute scoping call
We walk the stack, the constraints and the deadline. You leave with my honest read on the work, including if I'm the wrong person for it.
- 03
Start on one scoped piece
A single defined deliverable to begin — contract or full-time. You see how I work before anything bigger depends on it.
Experience
Software Engineer @ Independent
Sep 2025 - PresentIstanbul, Turkey · self-directed, building and operating my own products (not client work)
- Designed, built and shipped the projects on this site end to end — the base station O&M platform on Kubernetes, sole on-call for its first year in operation, and Feather, a complete subscription mobile product in Flutter
- Replaced the platform's Haversine distance maths with PostGIS spatial indexing: geographic queries over 100,000 records went from 8.5 seconds to 5 milliseconds
- Built this portfolio as a live platform rather than a page: a module registry, lazy-loaded interactive demos, a window manager and architecture deep-dives in Next.js and TypeScript
- Shipped and still operate İstanbul Chess, a live real-time multiplayer platform on Cloudflare Workers — one Durable Object per game, server-authoritative clocks, storage-backed reconnect
Research Engineer @ UpcoMinds
Feb 2025 - Aug 2025Brussels, Belgium
- Deployed Java/Spring Boot services on a self-managed Kubernetes cluster on AWS EC2 with Amazon RDS (PostgreSQL) for a production AI/ML pipeline
- Provisioned the cluster in code via the Fabric8 Java client; cut AI model training time by 70% by partitioning datasets into 10 segments for concurrent processing across nodes
- Wrote the Bitbucket Pipelines CI delivery pipeline, cutting deployment time by 60%, and secured API endpoints with Keycloak OAuth2 and RBAC
Software Engineer @ Freelance
Apr 2024 - Dec 2024Istanbul, Turkey (Remote)
- Built cross-platform medical imaging app in Flutter with custom TensorFlow models, achieving 95% diagnosis accuracy across 10,000+ images
- Developed financial planning app with Python backend, integrating OpenAI GPT API for natural language budget analysis
Software Developer (intern → part-time) @ Amani AI
Jul 2022 - Feb 2023Istanbul, Turkey
- Shipped an OpenCV pipeline detecting invalidated Turkish identity documents in 2 weeks against a 2-month estimate, removing manual review from the fraud-check workflow
Technical Skills
Languages
Backend & Messaging
Frontend & Mobile
Cloud & DevOps
Databases
Monitoring
Security
Tools
Testing
Education
B.Sc. Computer Engineering
Yeditepe University, Istanbul · 2020 - 2024
Computer Programming
Ege University, Izmir · 2018 - 2020
Flagship Project — Base Station O&M Platform
Solo-built telecom operations platform with 10 microservices, 19 K8s pods, 605 tests, and 113K lines of code across five languages — 43K Java, 27K Python, 20K React/TypeScript, 9.5K Go, 5K C.
Have a system that needs owning?
Tell me what it is and when you need it working. That's step one.