Open to opportunities

Руслан Валеев

@0001650

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Senior Ruby/Rails developer focused on TDD and performance optimization.

Thailand

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What I'm looking for

I seek a role where I can apply TDD and performance optimization on challenging, high-load projects, collaborate with a passionate team, and grow into technical leadership while working remotely or relocating.

I am a senior developer specializing in Ruby and Rails with deep expertise in test-driven development (TDD), performance optimization, and building high-load, production-critical systems such as international crypto trading platforms, learning management systems, and WebSocket-based chat services. I consistently deliver measurable improvements — including 4x CI/test time reduction, memory usage cut from gigabytes to kilobytes, and speedups of up to 170x — while maintaining rigorous test coverage and stability for applications handling substantial client assets.

I lead and collaborate with engineering teams to design integrations with exchanges and third-party services, optimize legacy codebases, and deploy scalable solutions. I am passionate about writing maintainable, well-tested code, mentoring peers, and applying practical refactors and instrumentation to achieve reliability and performance at scale.

Experience

Work history, roles, and key accomplishments

Current

Senior Developer

Current

3Commas

Apr 2022 - Present (3 years 6 months)

Led development and maintenance of a high-performance cryptocurrency trading platform serving thousands of concurrent users, implemented exchange integrations and production bug fixes while improving test coverage and performance.

Ruby Ruby on Rails WebSockets Performance Optimization TDD PostgreSQL Testing CI CD

Middle Developer

Synergy Corporation

Jun 2020 - Mar 2022 (1 year 9 months)

Developed and optimized a learning management system and high-load chat with government integration, increased test coverage and improved system performance.

Ruby on Rails Ruby WebSockets System Integration Performance Optimization TDD PostgreSQL Testing Refactoring

Middle Developer

Cashwagon

Jul 2018 - Mar 2020 (1 year 8 months)

Implemented new features, maintained codebase, integrated third-party APIs and performed refactoring and optimizations for a fintech microloan platform servicing Asian markets.

Ruby on Rails API Integration Refactoring Performance Tuning TDD PostgreSQL Testing

Head of Department

Arkona

Apr 2017 - Feb 2019 (1 year 10 months)

Managed maintenance of internal services including CMS, CRM and e-commerce systems, ensuring operational stability and feature delivery for office-equipment and distribution business.

Maintenance CMS CRM API Integration Team Leadership