Şafak SönmezSenior Software Developer / Technical Lead
Fintech · High-Throughput Systems · Distributed & Real-Time Platforms
I design, build, and own backend platforms for fintech and real-time products where throughput, correctness, and uptime matter. My work spans trading and custody systems, high-volume telemetry pipelines, distributed service architecture, and production operations from greenfield delivery to scale-up.
Building systems that hold under pressure
My work is centered on backend systems that operate under real pressure — fintech APIs, trading and custody workflows, distributed services processing real-time events, and telemetry pipelines where throughput and correctness both matter.
I own the full lifecycle: system design, implementation, infrastructure, observability, and production operations. I work in .NET, Go, Node.js, Rust, and Python, and I understand the tradeoffs that matter when building distributed systems in regulated, latency-sensitive environments.
When the product demands it, I also deliver full-stack. But my strongest contribution is always at the system and backend layer — designing for reliability, scalability, and long-term maintainability.
Domain Focus
Case Studies
A selection of systems I've designed, built, and operated in production.
Technical Stack
Core capabilities, grouped by function.
Languages & Frameworks
Backend & Architecture
Messaging & Real-Time
Data
Infrastructure
Domain Expertise
Frontend
— supporting capabilityWork History
Backend Developer / Technical Lead
Incodi Software Development- Own backend architecture and technical direction for fintech platforms across exchange, custody, derivatives, and live operations
- Built Bitexen Exchange/Custody capabilities including Django multi-tenant KYC, account/customer provisioning, deposits, withdrawals, balances, statements, and B2B flows
- Designed Bitexen Derivatives streaming architecture in Rust for up to 10,000 trades/sec and MetaTrader 5 operational flows
- Drove RideOn/DriveOn from greenfield to production with MQTT/live telemetry, React Native delivery, Docker, Kubernetes, and CI/CD ownership
- Built production-level real-time and transactional services across .NET, Redis, RabbitMQ, Kafka, CQRS/Event Sourcing, GraphQL, and Socket.IO
Backend Developer / Technical Lead
Yukatech AS- Progressed to backend lead role driving delivery for RouteControl and YukaTrack products
- Designed telemetry ingestion pipeline with Teltonika binary parsing and real-time geolocation processing
- Migrated the critical telemetry ingestion path from Node.js to Go, increasing capacity from roughly 80 to roughly 800 telemetry records/sec
- Implemented distributed backend components using Go, Node.js, MongoDB, Redis, RabbitMQ, and gRPC
- Supported production-focused backend work across service design, debugging, and deployment
Backend Developer (Part-Time)
GoAction- Contributed to a serverless product stack using AWS Lambda, API Gateway, DynamoDB, and Node.js
Freelance Full Stack Developer
Independent- Built commercial projects with .NET, Node.js, React, Python, and Laravel
- Delivered integration-heavy and real-time applications for various clients
Let's Talk
I'm open to Senior Software Developer, Technical Lead, and staff-track backend/platform roles focused on fintech, high-throughput systems, distributed architecture, and real-time production platforms. If reliability, throughput, and ownership matter, I'd like to hear about it.