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03Stack

Specialised in Java. Fluent across the stack.

Java and Spring Boot are where I go deepest. Everything else on this map connects to them, and each entry says where I have actually used it.

Technology map

JavaSpring BootSpring SecuritySpring Data JPAHibernateGraphQLREST APIsSpring AILangChain4jLangChainPostgreSQLRedisPrisma ORMAngularTypeScriptNext.jsReactVue.jsNode.jsPythonSystem integrationAutomationDocker · CI/CDExcel

Hover or focus a technology to see what it connects to.

By category

01Backend

  • JavaCoreJava 25 in a production modular monolith: ≈880 use cases, virtual threads, scheduled jobs and event listeners.
  • Spring BootCoreSpring Boot 4.1 with Spring Modulith: 20 modules, GraphQL, SSE, Flyway, Testcontainers and CI/CD to production.
  • Spring SecurityPrimaryRedis-backed sessions with CSRF, email MFA, Google OIDC, database-driven method security and an OAuth 2.1 server for MCP clients.
  • Spring Data JPAPrimary183 entities and repositories, keyset pagination, entity graphs and a test that counts SQL statements to catch N+1.
  • GraphQLPrimary≈200 queries and ≈220 mutations with Spring for GraphQL, DataLoader batching and depth/complexity limits.
  • REST APIsPrimaryWebhooks with HMAC verification, uploads, integration endpoints and HTTP clients for third-party APIs.
  • HibernateWorking knowledgeJPA provider in production: batch fetching, JDBC batching and optimistic locking.
  • Node.jsWorking knowledgeServer runtime for Next.js, build tooling and validation scripts.
  • PythonWorking knowledgeAutomation tooling against REST APIs: audits, migrations and graph layout for ≈400 CRM flows.

02AI Engineering

  • Spring AIPrimarySpring AI 2.0: agents with 122 permission-scoped tools, RAG on pgvector, validated structured output and an MCP server.
  • LangChain4jWorking knowledgeLLM orchestration for Java applications: chat models, tools and retrieval.
  • LangChainWorking knowledgeChains, agents and tool integration in Python.

03Database

  • PostgreSQLPrimaryRelational modelling, 74 Flyway migrations, pgvector, advisory locks and SKIP LOCKED work queues.
  • RedisPrimarySessions, cache, AI chat memory and Lua-based rate limiting.
  • Prisma ORMWorking knowledgeType-safe data access for Node.js and TypeScript services.

04Frontend

  • AngularPrimaryAngular 21, zoneless with signals: a production back-office with ≈110 lazy routes, real-time updates and a typed GraphQL client.
  • TypeScriptPrimaryStrict mode everywhere; typed API clients checked against the backend schema by a custom tool.
  • Next.jsPrimaryNext.js 16 App Router: prerendered multilingual sites with 3D, including this portfolio.
  • ReactWorking knowledgeReact 19 with server components and view transitions.
  • Vue.jsWorking knowledgeComponent-based interfaces with Vue.

05Other

  • System integrationPrimaryCheckout platforms, a CRM, the WhatsApp Cloud API, LLM providers and cloud billing, each with retries and limits.
  • AutomationWorking knowledgeDry-run → apply → verify → rollback scripts for production systems; scheduled report pipelines.
  • Docker · CI/CDWorking knowledgeLayered images, Docker Compose, Caddy and GitHub Actions deploys with health checks and rollback.
  • ExcelWorking knowledgeData analysis and operational reporting; XLSX generation from backend jobs.