Open to opportunities

Recep Yalman

@ryalman

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Senior software engineer specializing in distributed systems, architecture, and high-performance backend.

Turkey

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What I'm looking for

I seek senior engineering roles solving hard domain problems, improving system performance and reliability, mentoring teams, and using cloud-native architectures and modern backend technologies.

I am a senior software engineer with 15+ years across the SDLC, experienced in architecting distributed systems, designing domain models, and delivering high-performance backend services. I write and review large codebases and apply TDD, DDD, and hexagonal architecture to produce clean, maintainable systems.

I have led and mentored teams, guiding multiple engineers and founding testing and development practices that improved reliability and performance. I reduced batch runtimes dramatically, implemented concurrency and data-parallel solutions, and built secure, end-to-end microservices across cloud environments.

I seek roles where I can continue to solve complex domain problems, improve system design, and mentor engineers while driving measurable operational improvements using cloud, Java, Go, Python, and modern architecture patterns.

Experience

Work history, roles, and key accomplishments

Senior Software Engineer

Spiky.AI

Mar 2025 - Jun 2025 (3 months)

Developed a secure end-to-end video snippet microservice and refactored backend services to improve modularity and maintainability; introduced a Python testing culture with extensive test coverage.

Python AWS Lambda AWS CDK DynamoDB FFMPEG ISOBMFF Refactoring Test Driven Development

Senior Software Engineer

Adyen

Dec 2022 - May 2024 (1 year 5 months)

Reduced daily batch validation runtime from 19 to 7 hours and cut an aggregation service from 8 hours to 2 minutes by applying Java concurrency, data parallelism, and optimized PostgreSQL indexes.

Java PostgreSQL Concurrency Indexing Performance Optimization

Senior Backend Engineer

HelloFresh

Nov 2021 - Nov 2022 (1 year)

Improved backend service coherence and changeability, used C4 diagrams to clarify service structure, and stabilized A/B testing using immutable hash functions.

Go PostgreSQL Kubernetes Kafka A B Testing Service Design

Senior Software Engineer

SOTI Inc.

Dec 2020 - Aug 2021 (8 months)

Reduced bugs in LDAP connectors through testing and refactoring, resolved cross-region data inconsistencies with SQL/T-SQL scripts, and supported Elasticsearch performance improvements.

Java C++SQL T SQL LDAP Elasticsearch Debugging

Senior Software Engineer

Alef Education

Oct 2017 - Oct 2019 (2 years)

Led a team of 4 to integrate 25+ services with an OAuth2 provider, validated authentication at 50,000+ users, and developed authentication middleware and scheduling conflict detection algorithms.

Java Kotlin Spring Boot OAuth TDD DDD AWS

Lead Engineer

Destek Forex

Apr 2015 - Sep 2017 (2 years 5 months)

Led a team of 5 to build a trading gateway, implemented a Java wrapper for a trading server via JNI/JNA, and developed real-time alert and chart-data microservices with high-performance WebSocket support.