Panagiotis Panageas

Profile-based workflow engine with GPU-accelerated computer vision, distributed as a paid product.

• Designed a trigger evaluator covering global hotkeys, pixel colour, template matching, OCR, and YOLOX object models, behind a watchdog scheduler that enforces per-binding cooldowns and a focus guard restricting input to a target executable.
• Built release engineering around a SHA-256-hashed manifest and license activation, and added a preflight gate that fails the build when the configured app version disagrees with the version being published — after diagnosing exactly that mismatch on a clean install.
• Shipped per-binding diagnostics that explain why a trigger did or did not fire, replacing user guesswork with a traceable execution timeline.

Stack  Python · PySide6 · OpenCV · PyTorch · CUDA · YOLOX · EasyOCR · MSI packaging · license activation

Reliable background jobs for Python teams that do not want to operate a message broker.

• Implemented atomic claiming with FOR UPDATE SKIP LOCKED so a task is never handed to two workers concurrently; delivery is at-least-once, with idempotent handlers named as the contract in the docs.
• Built retries with exponential backoff, a dead-letter queue with retry and discard, priority routing, recurring cron schedules, per-task-type circuit breakers, and dependency chains that propagate BLOCKED state.
• Instrumented with Prometheus metrics, health endpoints, and structured logging; added a React dashboard, a gRPC API for polyglot workers, and deployment artifacts for Docker, Kubernetes, and systemd.

Stack  Python 3.11+ · asyncio · PostgreSQL · asyncpg · Pydantic · gRPC · Prometheus · FastAPI + React

Continuous ingestion of an external event stream, stored durably and served with low-latency queries.

• Ingestion worker consumes an upstream WebSocket feed and writes idempotently using deterministic dedup keys with ON CONFLICT DO NOTHING, so replayed events and process restarts cannot create duplicate rows.
• Reconnection uses exponential backoff with jitter plus an in-process circuit breaker; the query API serves cursor-paginated responses behind Redis caching and Redis-backed per-endpoint rate limiting.
• Instrumented end to end — Prometheus metrics scraped from both the API and worker processes, provisioned Grafana dashboards, request-ID propagation, structured JSON logs, and a separate retention job that purges expired rows.

Stack  FastAPI · SQLAlchemy 2.x async · PostgreSQL 16 · Redis 7 · Alembic · Prometheus · Grafana · Fly.io · GitHub Actions

Design, build, and commercially distribute software end to end.

• Own the full lifecycle: architecture, implementation, packaging and release engineering, licensing, documentation, and direct customer support.
• Operate production services on Fly.io with GitHub Actions CI/CD, secrets held outside the repository, and Alembic migrations applied before each release so the schema is always ahead of the running code.

High-consequence operational environment with no tolerance for unverified assumptions.

• Operated and maintained complex systems under strict procedure, where faults had to be diagnosed correctly the first time and deviations documented rather than improvised around.
• That habit — check before acting, record what changed, never assume the system is in the state you left it — is the same discipline I apply to release engineering and incident response.