Constantin Potapov

Senior Python Backend / R&D

Open to projects

15+ years in backendLong-term contracts

I write backend, untangle complex systems, and bring solutions to production. Clarity, reliability, and a working result — without a pretty wrapper over chaos.

FastAPI / Django / asyncio — from spec to deploy
15+ years in backend, 100+ shipped projects
Reply within 24 hours, work on long-term contracts

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What I can help with

Backend, R&D tooling, complex systems. Looking for long-term contracts — Python, Django, FastAPI.

Long-term contract

Backend under load

FastAPI or Django — from spec to deploy. Caching, indexes, query optimization, documentation, CI/CD.

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R&D

Untangle a complex system

Legacy code, technical debt, bottlenecks, migrations. I get into context, find the real problem, and bring it to working state.

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Python

Internal tooling & automation

Bots, ETL, CRM and API integrations, logging, internal platforms. Python, reliable, with support.

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Backend engineer with a strong R&D focus: I enjoy tasks where you need to understand a complex system, find the technical blocker, and bring the solution to production. I work well with legacy code, migrations, caching, integrations, and internal tooling.

I'm interested in AI-assisted development and use LLM tools to accelerate work — without substituting them for engineering responsibility. Outside engineering — music and writing.

20+

years in development

100+

shipped projects

24/7

production uptime

62+

courses on TPF

What I do

Backend that holds under load. Products that ship and sell.

Backend

Python, Django, FastAPI, SQLAlchemy

Databases

MariaDB, PostgreSQL, Redis

DevOps

Docker, Linux, Nginx, CI/CD

Monitoring

Prometheus, Grafana, Loki, Jaeger

AI / LLM

LLM integrations, embeddings, AI-assisted dev

Engineering

Code review, refactoring, documentation

Frontend (basic)

TypeScript, React, Next.js

How I can help

Senior Python backend on long-term contracts — complex systems, R&D tooling, automation.

REST APIs and services with FastAPI / Django — from spec to deploy

Untangling complex systems: legacy, technical debt, migrations

Internal tooling: logging, automation, ETL, bots

Caching, query optimization, index tuning

Integrations: CRM, HelpDesk, mailing, external APIs

R&D: prototyping, LLM integrations, AI-assisted development

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Work Experience

15+ years in backend: corporate sites and services, R&D tooling, migrations, integrations, DevOps.

Senior Python Backend Developer / R&D Engineer

ООО «ПВС» / PVS-Studio

2020 — 2025

Developed pvs-studio.com and ~20 related company web projects: Django, FastAPI, DevOps, internal R&D tooling.

Migrated the main site from Python 3.9 to Python 3.13; resolved legacy blockers in dependencies and the search system.
Optimized key pages via Redis caching with auto-invalidation and MariaDB index tuning.
Built SmartCache — an internal Python library on top of Redis for managed caching with automatic invalidation.
Developed R&D tooling: Perfector, Phylactery, and the logger.pvs-studio.com logging platform with Python SDK (3 projects connected at time of departure).
Containerized ~20 projects; standardized Docker approach across dev/stage/prod.
Led and delivered the technical implementation for 152-FZ compliance: split Russian and global infrastructure, configured environments, deployment, and data storage.
Conducted code review for 2 developers; participated in knowledge sharing and technical documentation.

PythonDjangoFastAPIMariaDBRedisDockerLinuxNginxCI/CD

Python Backend Developer / Systems Engineer

ООО «СиПроВер» / PVS-Studio

2016 — 2020

Maintained and developed the viva64.com corporate site on Python/Django; contributed to the new site engine.

Migrated the main site from Python 2.7 to Python 3.9 and an updated Django stack.
Contributed to the design and release of the new viva64.com site engine.
Developed backend architecture, integrations with CRM, HelpDesk, mailing services, and analytics.
DevOps: Linux, Nginx, Docker, Gunicorn, databases, HTTPS, email infrastructure, monitoring, backups.
Implemented technical SEO improvements: AMP pages, structured data, Google/Yandex Analytics integrations.

PythonDjangoMariaDBRedisDockerLinuxNginx

Python Backend / R&D Engineer

Independent Projects / R&D

2025 — н.в.

Building Python/backend MVPs and open-source tools; deepening practice in AI-assisted development, FastAPI, PostgreSQL, embeddings, and LLM pipelines.

Tech Path Finder (tech-path-finder.ru) — public EdTech MVP: FastAPI, async SQLAlchemy, PostgreSQL, Redis, JWT/OAuth, RBAC, rate limiting, AI content generation and mock interviews via OpenRouter.
Set up Docker Compose, Prometheus/Grafana/Loki/Jaeger, tests, AdminUI, and AI response validation; frontend on Next.js/React.
ReplyRadar — open-source local-first tool for Telegram conversation analysis: FastAPI, PostgreSQL + pgvector, Telethon, Alembic, LLM pipeline classify/extract/embed.

FastAPIPostgreSQLpgvectorRedisDockerPrometheusGrafanaNext.jsOpenRouter

Project Director / Technical Coordinator

Агентство «Социогенетика»

2012 — 2015

Coordinated development of web platforms and services from requirements to delivery.

Wrote technical specifications and aligned solutions with clients and the development team.
CRM logistics automation for START transport company — route optimization and order management.
Management system for Eurasian Youth Economic Forum (SCO) — registration, scheduling, integrations.
Realauto.ru — automated auto-listing parser with smart search.

PythonDjangoMySQLJavaScript

Python Developer

Signception

2009 — 2012

Building web services and startups from scratch: from idea to production.

Vrespecte.com — social network for hip-hop fans (5000+ users, audio/video streaming).
Wedding planning SaaS — full event management cycle, CRM for organizers.
Video hosting with upload, transcoding, and streaming (FFmpeg, HLS).

PythonDjangoMySQLRedisNginxFFmpeg