Hire the Best Apache Kafka Developers
in the Czech Republic

I’m a technical QA engineer who finds issues before users do—across UI, APIs, and data. I write clear bug reports, validate complex flows, and build automation that reduces regression risk and speeds up releases. With ~10 years in Java and QA automation lead experience in product companies (iGaming), I’ve built custom, maintainable test frameworks and stabilized CI pipelines. I can help with: * Manual QA: functional/regression/exploratory testing, UX issues, release checklists * API & technical validation: Postman/RestAssured, JSON validation, logs/data checks * Automation: Selenium UI + API tests (JUnit/RestAssured, custom frameworks), Testcontainers, Allure, CI integration * Performance: JMeter/Gatling (optional) I’m happy to start manually and add automation where it gives the highest ROI. Open to a short paid trial (5–10 hours) to prove fit quickly.

Most developers build things. I fix them. When something breaks and nobody knows why, that's where I come in. I find the problem, fix it and you're back in business. 💥App crashing or acting weird - crashes for no reason, works differently on different devices, broken on mobile or some browsers, behaves strangely after an update. 💥App running slow - pages take forever to load, simple actions hang for too long, dashboards and reports are slow and painful to use. 💥Integration not working - app can't connect to another system, API stopped working after an update, two systems that simply won't talk to each other. 💥Vibe coded or can't deploy - AI-generated app nobody understands anymore, works locally but not on the server, agency left broken code behind and disappeared. 💥Old system - needs to move to a new platform, the company that built it is gone, old code nobody wants to touch but still needs new features. 💥Developer disappeared - left no documentation, nobody understands what is going on, project is stuck and nobody knows what to do next. 💥Security problems - app was hacked, serious security issues hiding in the code, private data got out and you need it fixed now. Sound familiar? I do not disappear. I do not hand you off to a junior. You get me, 20 years of experience, Expert-Vetted status and 100% Job Success. Every time. Not sure if I can help? Just tell me what is on fire. I will take a look and give you a straight answer. No "sugarcoating". Let's talk. ⚡ Programming Languages JavaScript, TypeScript, C#, Python, PHP, Java, PowerShell, Bash/Shell, VBA, C++, C, Assembly, HTML, CSS, SASS/SCSS ⚡ Application Frameworks Angular, React, Next.js, Vue.js, Node.js, .NET, ASP.NET, Gatsby, Express.js, Laravel, Remix, Astro, Svelte, Blazor, Electron, AG Grid ⚡ Databases SQL, MongoDB, MySQL, Microsoft SQL Server, PostgreSQL, Oracle, SQLite, Redis, Elasticsearch, Firebase Firestore, MariaDB, Microsoft Access ⚡ API REST API, GraphQL, WebSockets, gRPC, SOAP, OpenAPI/Swagger, WebHooks, SSE, JSON-RPC, XML-RPC, OData, API Gateway, tRPC, SignalR, CORS ⚡ Cloud Platforms Google Cloud Platform, Microsoft Azure, Amazon Web Services, Firebase, Vercel, Netlify, Supabase ⚡ DevOps Docker, Kubernetes, Jenkins, GitLab CI/CD, GitHub Actions, TeamCity, Nexus, Nginx, IIS, Terraform, Helm, Bitbucket Pipelines, Azure DevOps, OpenShift, Grafana, Chef ⚡ CSS Frameworks Tailwind CSS, Bootstrap, Material UI, Angular Material, HeadlessUI ⚡ Mobile Frameworks React Native, Apache Cordova, Capacitor by Ionic, Expo, Ionic ⚡ Testing Frameworks Playwright, Jest, Karma, Vitest, Jasmine, Cypress, Selenium, xUnit, NUnit, MSTest, Puppeteer, WebdriverIO, Storybook ⚡ Authorization OAuth, JWT, Auth0, Firebase Authentication, Passport.js, NextAuth.js, Azure AD, SAML, OpenID Connect, LDAP, Microsoft Identity Platform, AWS Cognito, Supabase Auth ⚡ Database Frameworks Entity Framework, Prisma, Mongoose ⚡ Logging ELK Stack, Log4net, NLog, Serilog, Logstash ⚡ Integrations Stripe API, Google Maps API, Firebase API, GitHub API, GitLab API, n8n, Apache Kafka ⚡ Architecture Microservices, Monolithic, Event-driven, Serverless, Headless, MVC, MVVM, Domain-Driven Design (DDD), CQRS, SOA, Dependency Injection (DI), Inversion of Control (IoC), SOLID principles, Design Patterns (GoF) ⚡ AI Tools GitHub Copilot, GitHub Copilot CLI, Claude, Claude Code, Gemini, Gemini CLI, Ollama, ChatGPT, Codex ⚡ Machine Learning PyTorch, TensorFlow, Keras, Scikit-learn, Pandas, NumPy, Jupyter Notebook, Kaggle, Hugging Face ⚡ Code Quality ESLint, Prettier, SonarQube, StyleLint, TSLint, ReSharper, StyleCop, Roslyn Analyzers, Pylint ⚡ Package Managers npm, yarn, pnpm, NuGet, pip, Homebrew, Maven, Gradle, UV, apt, yum, Chocolatey, winget ⚡ IDEs VS Code, Visual Studio, IntelliJ IDEA, PyCharm, Vim, Xcode ⚡ Operating Systems Windows, Linux, macOS, Android, iOS

"I have always enjoyed supporting others with their projects while learning something new. Having had the privilege of working alongside great colleagues, I have accumulated a wealth of knowledge that I would like to use to help others and make their projects come to fruition. My personal motto is "Do the work that you can be proud of." I am excited at the prospect of assisting you in moving your project forward."

I am a DevOps and Event Streaming Engineer with strong expertise in cloud infrastructure, CI/CD automation (Jenkins, Gitlab CI), containerization (Docker, Kubernetes), and real-time data streaming (Kafka, Pulsar). Beyond development (Java, Python, JavaScript), I specialize in designing scalable architectures and solutions on Kafka, ensuring efficient data flow, fault tolerance, and high availability for event-driven applications.

I’m a Backend Developer focused on NestJS and microservices. On larger tasks I work as a two-developer unit (backend + backend/DevOps), so we can deliver faster while keeping the same quality bar. You’ll still work with me directly. What we do well • REST/GraphQL APIs with auth/roles • Crypto integrations (USDT/ETH/BNB), Web3.js/Ethers.js • Background jobs & queues (BullMQ/Redis) • WebSockets • Postgres/Mongo • Scraping/automation (Playwright/Puppeteer) • CI/CD & Docker deploys. Recent work • Crypto payment gateway (wallet gen + status webhooks) • Smart-contract betting service + backend orchestration • Auction scraper with MongoDB storage • Microservice crypto platform (wallets, transactions, notifications). Clear communication, small secure increments, production-ready handover. Available for quick bug-fixes or full features.

Hi There, I'm Tomas senior Java/Scala & web developer in Prague, Czech republic. My mother tongue is Czech and I can fluently speak English. My experiences range from building simple responsive web sites to designing large scalable systems for financial business. I like working in a team that cares about design quality and solution's maintainability. I excel in solution design, Java based technologies and I'm fast in learning new technologies. I'm flexible in my working hours and happy yo work with other freelancers you wor with. I'm looking forward to solve your IT problems for you!