Hire the Best Apache Kafka Developers
in Germany

⚡️ Do you have a new product to build, and are you looking for an expert backend developer you can trust to design and build the server side of your product? Look no further! I have more than 10 years of experience in web development with various programming languages (mostly PHP and Golang) in very different companies (from big tech to small non-profit projects). Now I specialize in building startups: ✅ I design, implement and deploy features as fast as possible ✅ I always add valuable metrics ✅ I write clean code that can easily grow and evolve for your product's needs. ✅ I can suggest existing services, open-source tools/libraries, or no-code/low-code solutions reducing development. I'm a full-time Upwork freelancer, and this is not just a side hustle for me. I can offer you a professional project delivery with high-quality code and clean architecture. I will take the time to understand your needs and ensure that the product works according to your vision. ⏩ If you're looking for a professional and experienced backend developer who will deliver the results you want, contact me right now to make progress together!

I build software the way 2026 demands it: fast, intelligent, and end-to-end. With 5+ years of full-stack engineering and deep, hands-on AI tooling experience, I sit at the intersection where clean code meets agentic systems. I don't just write applications — I architect them with AI in from the start. What I bring to your project: 🧠 AI-Augmented Development — I work natively with Claude and modern AI assistance tooling to build faster and ship cleaner than traditional workflows allow. Every layer benefits. 🤖 AI Agents & Workflows — From idea to production: I design and build autonomous AI agents, multi-step AI pipelines, and intelligent automation workflows tailored to your business logic. 🔌 MCP Server Integration — I integrate Model Context Protocol (MCP) servers to connect AI models with real data, tools, and APIs — unlocking genuinely useful, context-aware AI features inside your product. ⚙️ Full-Stack Engineering — Angular, React, Next.js on the front; Spring Boot, Postgres, Supabase on the back. Scalable, maintainable, production-ready. 🎨 Design-to-Deployment — I close the loop between design and engineering, building frontends users actually enjoy and backends that hold up under pressure.

Dear Sir or Madam, My name is Oleksandr Prognimak. I have been working as a software developer for 33 years. I have extensive and longstanding experience in the following programming languages, frameworks, libraries, and technologies. Currently, my main focus is on the following IT areas: Java, JEE, Spring, Spring Boot, Angular, HTML5, JavaScript, TypeScript, CSS, SQL, PL/SQL, Docker, JUnit, Mockito, WireMock, Pact io, Maven, Oracle, PostgreSQL, and Azure Cloud. Here is the complete list of my skills: Skills, consulting, and development as a freelancer in the following areas: - Java: JDK 1.1 - 21, JSE, Swing, AWT - JEE: J2EE, JEE5,6,7,8,10 (Servlet, CDI, EJB, JPA, JMX, JMS, JSF) - Spring/Spring Boot: Spring Core, Spring Boot, Spring Test, Spring Data, Spring Integration, Spring Batch, Microservices - Cloud: Azure, AWS - Web Development/UI: Angular 4,7,10,16; Vue.js 2,3; TypeScript, GWT, Vaadin, JSP, JSF (RichFaces, PrimeFaces), HTML4, HTML5, JavaScript, JQuery, AJAX, Struts, Spring MVC - Web Services: SOAP, SOA, RESTful, Rest-API, OpenAPI, Swagger, RestEasy, Jersey, JSE HttpClient - ORM: Hibernate, EclipseLink, Apache OpenJPA - RDBMS/SQL: Oracle, Postgres, MySQL, MS-SQL, SQL, PL/SQL, MS Access, Teradata, H2 - App. Server/Servlet Container: Apache HTTP, Apache Tomcat, JBoss, Wildfly, Websphere, OC4J - XML Processing: AXIS-2, XPath, XSLT, XML Schemas, JAXP, JAXB - Build Tools: ANT, Maven, Gradle, Mojo - Source Code Management: GIT, GitLab, GitHub, Bitbucket, SVN, CVS - Case Tools/UML: Magic Draw, Software Architect, Together, ERWin, RationalRose - Report Tools: Jasper Report, BIRT Reports, Oracle Forms and Reports, Eclipse BI-Reports - Security: Java Security, JSSE, PKI, Websecurity, X509 - Test Tools/Testing: JUnit, TestNG, Cucumber, JBehave, Mockito, WireMock, EasyMock, Spring Test, Pact io, LoadTest, IntegrationTest, CI - MS-Office: VB, VBA, Excel-VBA, Access-VBA - Container Virtualization: Docker, Docker-Compose, Swarm, Kubernetes (K8) - Big Data: Apache Kafka, Zookeeper - Very Old Skills: C, C++, Basic, Pascal I am available immediately. Best regards, Oleksandr Prognimak

⭐️ 8+ Years in Software Engineering (Golang, Python) ⭐️ Hands-on LLM/ChatGPT/RAG product development and large-scale ML hosting on AWS ECS/CDK ⭐️ Backend for global platforms serving 3M+ users/day ⭐️ CKAD, AWS Solutions Architect – Associate & AWS DevOps Engineer – Professional certified ⭐️ Strong background in microservices, cloud-native systems & real-time data pipelines ⭐️ Slack-JIRA AI assistant, Foodpanda homescreen infra, Amazon PDP localization pipeline ⭐️ High-impact Upwork client results with consistent 5.0 ratings 🧑‍💻 Back-End Engineering (Golang, Python) ☑️ REST, gRPC, GraphQL API design ☑️ Go frameworks: Gin, Echo, Revel, Martini, Gorilla ☑️ ORM: Gorm, go-pg | Testing: GoMega, Ginkgo, go-mock ☑️ Concurrency: goroutines, channels, worker pools ☑️ Dependency Injection: go-wire ☑️ Structured logging: zap, zerolog, logrus ☑️ GolangCI-lint contributor – deep attention to clean code and linting 🧑‍💻 Cloud & Infrastructure ☑️ AWS: Lambda, ECS, RDS, DynamoDB, S3, API Gateway, Secrets Manager, CDK ☑️ GCP: Cloud Run (standalone & GKE), Firestore, Pub/Sub ☑️ Infrastructure as Code: Terraform, Ansible ☑️ Docker, Kubernetes (CKAD), Helm ☑️ CI/CD: GitHub Actions, Jenkins, Bitbucket Pipelines 🧑‍💻 Databases & Caching ☑️ PostgreSQL, MySQL, MongoDB, DynamoDB, Firestore ☑️ Redis, Memcached, Key-vault ☑️ Neo4j (graph db), Elasticsearch (search & analytics) 🧑‍💻 DevOps, Observability, Streaming ☑️ RabbitMQ, Apache Kafka, Apache Schema Registry ☑️ Prometheus, Grafana, Datadog, AWS CloudWatch ☑️ Log pipelines: ELK (Elasticsearch, Logstash, Kibana), Filebeat 🛠 Blockchain & Decentralized Systems ☑️ Ethereum, Web3 API, ERC-20 Token Transfers ☑️ Cowswap DEX integration ☑️ Katzenpost Mixnet-based Ethereum transaction privacy router ☑️ Secure wallet interaction, order book access, token tracking 🧑‍💻 AI / GenAI / LLM Work ☑️ LangChain, ChatGPT, Retrieval-Augmented Generation (RAG) ☑️ Slack-JIRA LLM assistant (LangChain + Python + ChromaDB) ☑️ TruthWatch: Real-time YouTube AI content audit web app ☑️ Amazon-scale LLM hosting & PDP localization pipeline ☑️ Prompt engineering, LLM pipelines, context chaining

I’m a seasoned software engineer and DevOps practitioner who loves building fast, reliable systems with Go (and I’m comfortable across other modern languages, too). I’m deep on Linux internals—namespaces, cgroups, KVM—and right at home with containers and virtualization. From day one I favor event-driven, clustered designs so we can scale horizontally early and skip painful rewrites later. I’ve shipped and operated high-performance, zero-trust, mission-critical apps across network security, finance, and blockchain. I care a lot about clean CI/CD, strong observability, and catching bugs and bottlenecks before users ever feel them. I run Kubernetes in the wild—managed (AWS, Azure) and self-managed—and I’ve used Docker Swarm when it fits. I thrive in remote-first, multinational teams and I’ve led them with a calm, transparent style (Scrum/Agile). I’m very customer-centric: at Skalex I worked directly with clients, flew on-site, and tailored the core product quickly to keep them happy. I love sharing what I learn. I’m writing A Practical Guide to Building, Profiling, and Troubleshooting High-Performance, Scalable Go Applications on Linux. And I’m always learning—right now it’s AI, IoT, and robotics. If we work together, you’ll get a pragmatic builder, a thoughtful teammate, and someone who genuinely cares about users.

I help SaaS and enterprise teams build reliable, high-performance backends and data pipelines that actually scale. 20+ years shipping production systems. I specialize in: • FastAPI microservices & real-time Kafka streaming • Complex ETL/ELT pipelines (Oracle → PostgreSQL/BigQuery) • SQL query tuning & performance rescues (12s → 300ms is normal) • API integrations (Stripe, PayPal, ERP, custom REST) • Docker + Azure/GCP cloud deployments Recent wins on Upwork: • Payment processor integration delivered in 8 days (5.0 rating, June 2024) • Backend systems for Best Secret GmbH & Oetker Digital (Kafka + Java + PostgreSQL) If your current setup is slow, breaking, or you need a new pipeline yesterday — I respond same day and usually ship working prototypes in 48–72 hours.