Building scalable, reliable systems with a focus on clean architecture and business value.

Languages & Frameworks

Architecture & Tools

• Core: Event-Driven Architecture, Microservices, REST API Design, Multi-tenancy.
• Tools: Docker, CI/CD Pipelines, Redis, SQLAlchemy, Pydantic, Message Queues.

I don't just implement features — I design systems that scale and last.

Production-ready SaaS backend на FastAPI.

• Key Focus: Auth (JWT + refresh), multi-tenant isolation, billing (Stripe/Mock), admin CRUD.
• Tech: Python 3.12, FastAPI, SQLAlchemy 2 (async), PostgreSQL, Redis, Docker.
• Observability: Prometheus metrics, health checks, lynx-logger.

A production-ready structured logging library built for complex environments.

• Key Focus: Context tracing in multi-tenant APIs and background services.
• Tech: Python, Structlog, Isomorphic logging.

Advanced profanity filter with evasion detection.

• Key Focus: Homoglyph detection, similarity matching (fuzzy logic), and multi-language support.

Fill Word templates using YAML configs with a powerful expression language and SQLite integration.

• Key Focus: Custom expression language (tokenizer + recursive-descent parser + AST evaluator), 59 built-in functions, PDF export, GUI with syntax highlighting.
• Tech: Python 3.10+, python-docx, PyYAML, SQLite, CustomTkinter.

Deep dives into real-world technical decisions:

• Multi-tenant Identity: User → Person + SubUser decomposition for SaaS.
• Reliable WebSockets: Transactional Outbox + Queue + WS Gateway pattern.
• Domain Isolation: Strict bounded contexts for scalable microservices.
• File Processing: Secure multi-step uploads with Redis-backed metadata.

I help startups and businesses choose the right technical approach, reduce future complexity, and prevent technical debt.

• Telegram: @FlacSSy
• Email: flacsy.x@gmail.com
• Working on: High-load backends, system refactoring, and security-first APIs.