API and domain architecture
REST APIs, business rules, service boundaries, validation, permissions, and predictable error handling.
PYTHON · FASTAPI · POSTGRESQL
Python & FastAPI backends built for real operations
I design and deliver dependable backend systems for products that need more than a quick prototype: clear domain logic, secure access, reliable integrations, and an operational path to production.
WHAT I DELIVER
A complete working system, not an isolated code fragment.
Data and background processing
PostgreSQL models, migrations, Redis, queues, schedulers, idempotent jobs, and safe retries.
Payments and integrations
Billing, webhooks, third-party APIs, CRM connections, email, messaging, and auditable event flows.
Production handover
Docker deployment, health checks, structured logging, tests, documentation, and a practical handover.
DELIVERY PROCESS
From an unclear workflow to a controlled release.
- 01
Clarify the business workflow, edge cases, expected load, and integration boundaries.
- 02
Define the smallest architecture that is safe to extend without overengineering the first release.
- 03
Deliver working increments, test failure paths, and keep technical decisions visible.
- 04
Deploy, verify production behavior, and document the system for further development.
RELEVANT PROOF
Case studies connected to this service.
CRM · TELEPHONY · AI
Zvonex CRM: sales, telephony, and AI in one workspace
A production-ready multi-tenant CRM where managers work with contacts, calls, tasks, messages, and AI insights in one auditable timeline.
Read case study ↗SEARCH · TELEGRAMTechPlanner: engineering standards search without manual browsing
A production-ready search assistant that extracts heterogeneous technical documents, retrieves relevant passages in Russian and English, and controls access through a Telegram subscription workflow.
Read case study ↗24/7 AUTOMATIONSteam Rental Ops: a 24/7 marketplace workflow
A production automation platform that receives and deduplicates marketplace orders, delivers access, monitors a live Dota 2 session, rotates credentials safely, and returns inventory to sale.
Read case study ↗COMMON QUESTIONS
Useful details before we start.
Can you extend an existing FastAPI project?+
Yes. I first map the current architecture and risks, then isolate the change so existing behavior remains stable.
Do you build the frontend too?+
Yes. When the product needs it, I connect the backend to a responsive React interface or administration panel.
Can you work with unclear requirements?+
Yes. I turn the current workflow into a concrete scope, identify assumptions, and propose a staged implementation.
HAVE A REAL WORKFLOW TO IMPROVE?