Post a Job
Radoslaw Kamysz
Radoslaw Kamysz

Senior Backend Engineer

Open to offers · Member since 21 Oct 2026
Message
Location
Hamburg, Germany
Desired salary
Unspecified
Work preference
Remote Only
Experience level
Senior

About

Professional summary

I am a senior backend engineer and former backend lead with more than 15 years of software engineering experience. I specialise in Node.js and TypeScript and take ownership of products from architecture through production delivery.

I design scalable backend systems, APIs, and data platforms with a focus on reliability, performance, and maintainability. My work includes distributed systems, event-driven architecture, domain-driven design, clean architecture, and modular monoliths.

I have led migrations from tightly coupled code and database monoliths to domain-oriented modular architectures while maintaining production continuity. I have also designed APIs serving more than 500,000 users and improved system performance by up to 80% through architectural and database optimisation.

I combine hands-on engineering with technical direction, backend delivery ownership, mentoring, and cross-team collaboration. I build automation and testing workflows that improve developer productivity and have reduced development time by approximately 40%.

I am experienced with AWS-based services, CI/CD, observability, PostgreSQL, MongoDB, Redis, Python, and FastAPI. I am based in Hamburg, Germany, and am interested in remote opportunities within Europe.

Skills

33 capabilities
API DesignAuthenticationAuthorizationAWSBackend EngineeringBlockchainCI CDDatabase OptimizationDistributed SystemsDomain Driven DesignEnd To End TestingEvent Driven ArchitecturefastAPIFintechFlutterIntegration TestingMentoringMongoDBNext.jsObservabilityPerformance OptimizationPostgreSQLProduct DevelopmentPythonRedisReliability EngineeringREST APIsRustScalabilityTechnical LeadershipTest AutomationTypeScriptWebSockets

Tech stack & tools

Working toolkit

Analytics

Sentry

Application Hosting

CloudflareRedis

Data Stores

MongoDBPostgreSQL

Languages & Frameworks

FastAPIFlutterPythonRustSpring FrameworkTypeScript

Monitoring

DataDog

Experience

Career history

Senior Backend Engineer SoSafe

Led the migration of a code and database monolith into domain-oriented modular monoliths without disrupting production. Defined domain boundaries and separated database responsibilities to make data ownership and backend responsibilities explicit.

Introduced event-driven communication between domains to reduce coupling and support modular team development. Built Datadog dashboards for p95 latency and service reliability monitoring against SLOs and SLAs, and used Sentry for application error tracking and investigation.

Lead Backend Engineer Dacoco / Alien Worlds

Owned core API architecture and backend delivery, providing technical direction for the engineering team. Improved leaderboard performance by up to 80% through architecture and database optimisation.

Reduced development time by approximately 40% through tooling and automation. Designed blockchain data-processing and history tools using Node.js, TypeScript, MongoDB, Redis, WebSockets, and EOSIO.

Senior Backend Engineer Dacoco / Alien Worlds

Introduced Clean Architecture and modularisation across backend services to improve maintainability and service boundaries.

Improved deployment efficiency by approximately 60% through GitHub Actions. Built tooling to keep blockchain ABI definitions and TypeScript code in sync.

Senior Software Engineer finleap

Built and owned an AWS-hosted test environment that enabled repeatable validation of fintech products before production releases.

Implemented a JSON-driven scenario runner to orchestrate backend services and scrapers. Enabled automated integration and end-to-end testing of bank communication and transaction workflows across multiple services.

Senior Software Engineer Quantilope

Worked as a senior software engineer at Quantilope.

Specific responsibilities, technologies, and employment dates were not provided in the resume.

Assets Conversion Lead / Senior Software Engineer Goodgame Studios

Led asset conversion work and contributed as a senior software engineer. Built an asset-processing pipeline for graphics and development teams.

Automated asset exports and repetitive production tasks to reduce manual work and streamline production workflows.

Software Engineer GameDesire

Worked as a software engineer at GameDesire.

Specific responsibilities, technologies, and employment dates were not provided in the resume.

Creator / Developer Eduria

Developing an educational product for children across physical books, a mobile application, digital portals, and AI-assisted learning workflows. Own product design and technical development for the parent portal, character customisation, interactive learning experiences, and supporting services.

Design backend workflows around learner context, progress tracking, learning history, and personalised support. The stack includes Flutter, Rive, Next.js, TypeScript, Cloudflare, Python, FastAPI, PostgreSQL, Redis, and Rust for the game server.

Open-source Creator and Maintainer SoapJS / SoapRS

Created SoapJS, a TypeScript framework and ecosystem focused on Clean Architecture.

Extending the same architectural approach to Rust through SoapRS as an open-source creator and maintainer.

Education

Learning history

University of Warmia and Mazury

BSc, Mathematics & Computer Science

This professional hasn’t added portfolio projects yet.

This professional hasn’t listed any services yet.

Report this profile

Why are you reporting this profile?
Share
Jobs Talent AI Tools Salaries
Menu