Technical Stack & Architecture

Java 21 & Spring Boot 4

Virtual Threads, Spring Boot 4.1, Spring Cloud Gateway (WebFlux), Spring Security, JPA/Hibernate.

Go (Golang)

Concurrent microservices, Chi & Gin HTTP routers, goroutines, bounded channels, pgx pooling, XML/JSON parsers.

Python & FastAPI

Async event loops, SQLAlchemy 2.0 (async), Alembic migrations, OpenCV/DeepFace verification services.

WebSockets (STOMP) & REST

Full-duplex real-time pipeline event broadcasting, STOMP protocol, RESTful design, OpenAPI 3 / Swagger specs.

PostgreSQL & Database Migrations

Complex joins, indexing, connection pooling, Alembic & Flyway automated migrations, blue/green evolution.

Apache Kafka

Asynchronous microservice communication, consumer groups, transactional event delivery between isolated services.

Redis

Distributed caching, Pub/Sub multi-node message fanout, token blacklist checks, rate limiting.

S3 (Object Storage)

Presigned URL claim-check pattern for ML/file transfers, streaming image delivery without RAM overhead.

Docker & Container Isolation

Multi-stage builds, DooD (Docker-out-of-Docker) build runner sandboxing, healthcheck orchestrations.

Docker Compose

Multi-service local orchestration, volume management, service dependency graphs, isolated networks.

CI/CD & GitHub Actions

Automated test-and-build workflows, GHCR container publishing, SSH deploys, self-hosted DAG engine (Zovik).

Linux Systems

Ubuntu server administration, systemd service units, socket tuning, bash scripting, log analytics.

Hexagonal Architecture & DDD

Database-per-Service isolation, decoupled domain logic, ports & adapters, Master-Worker topologies.

Testcontainers & JaCoCo

Integration testing with ephemeral PostgreSQL, Redis & Kafka instances (@ServiceConnection), JUnit 5, JaCoCo coverage.

Git & Version Control

Trunk-based development, semantic commits, PR reviews, Eclipse JGit programmatic repository management.