Open to opportunities

Riuji User

@riujiuser

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Python backend developer specializing in async systems, API integrations, and automation.

Netherlands

Message

What I'm looking for

I seek remote backend roles or contracts focused on async systems, API integration, and automation, with clear impact and technical ownership.

I am a backend developer with four years of freelance and contract experience building asynchronous systems, API integrations, and automation tools. I solve ambiguous problems end-to-end — for example, I reverse-engineered a disabled signing algorithm from a frontend and restored full API access to deliver a production trading engine.

My work emphasizes robust architectures and fault isolation: I designed a modular SDK and async trading engine with per-account RPS limiting, centralized fault isolation, real-time WebSocket UI, and structured logging, yielding zero critical failures in live trading. I have delivered 10+ projects including bots, reseller platforms, live game telemetry, and automation pipelines.

I am fully authorized to work in the EU, open to remote backend roles and contracts, and continually expanding my skills in Docker, CI/CD (GitHub Actions), and cloud deployment.

Experience

Work history, roles, and key accomplishments

Current

Python Backend Developer

Current

Freelance & Private Contract

Jan 2022 - Present (4 years 3 months)

Delivered 10+ end-to-end backend projects and maintained a 1.5-year recurring contract; built a multi-account async trading engine for MEXC after reverse-engineering a disabled API, achieving zero critical failures in live trading.

Python AsyncIO fastAPI WebSockets TortoiseORM SQLite Curl_cffi Reverse Engineering

Education

Degrees, certifications, and relevant coursework

Self-taught

Self-directed learning, Python Backend Development

2022 -

Activities and societies: Freelance projects, open-source contributions, hands-on reverse engineering and API integration work

Built practical Python backend skills through freelance projects, open-source study, and hands-on problem solving, delivering first freelance project within one month of starting.