Anton Safonov

KEYGO (property management) · Moscow, Russia (Remote)

• Cut page load time up to 81% (LCP 4.7s to 0.9s) by leading a full client frontend rebuild: Next.js 16 with Turbopack, TypeScript, Tailwind v4 design system and a pnpm monorepo, with mobile-responsive UX and zero layout shift
• Rebuilt the booking funnel end-to-end: mobile checkout wizard, Airbnb-style search with inline filters, in-checkout promo codes and a reworked ranking core, turning a leaky flow into a conversion-ready funnel
• Built a financial calculation freezing and versioning mechanism that aligned host reports with the payouts page, eliminating reporting discrepancies across $200K+ in monthly transactions
• Migrated platform-wide authentication from JWT to revocable Redis-backed session cookies across all services, with brute-force protection and a zero-downtime password migration
• Drove AI-assisted development across the engineering team as frontend technical owner: mentored the team on Claude Code workflows, unified codestyle, and lifted overall delivery throughput

Python · FastAPI · MongoDB · Redis · React · Next.js · Turbopack · TypeScript · Tailwind CSS · PostHog · Sentry

Realytics (AI performance analytics for consumer businesses) · Nicosia, Cyprus (Remote)

• Built and owned a mission-critical, SLA-bound B2B API delivering weekly competitive intelligence to a major European food-delivery client, with full data traceability and audit trails end to end
• Built an async ETL pipeline normalizing 20GB+/day from disparate sources (maps, delivery platforms, reviews) into a unified analytics store, feeding near-real-time aggregations
• Designed two API microservices: an LLM service that parsed messy, unstructured addresses into clean structured data, and a localization service

Python · FastAPI · ClickHouse · PostgreSQL · Redis · RabbitMQ · Docker · Prometheus · Grafana

e-comet.io (analytics and promotion automation for Wildberries) · Moscow, Russia

• Cut API latency 40% and ClickHouse load 20% on a high-load analytics API serving 300GB/day of marketplace data over an 8TB+ warehouse, by tuning queries and data pipelines
• Developed fail-safe mechanisms for all critical pricing and advertising budget operations, guaranteeing safe system performance for 200+ clients even during external API and internal service unavailability

Python · FastAPI · ClickHouse · PostgreSQL · Redis · RabbitMQ · Docker · Elasticsearch · Yandex Cloud

@TarotMeowBot · GitHub

Built and shipped an AI product solo, from zero to production (architecture, payments, analytics, CI/CD): grew to 1,500+ users at 85% D1 retention, with up to 7% paid conversion among paywall-exposed users and every product decision driven by PostHog analytics (50+ events, cohort funnels). Extracted the core into Gramkit, an open-source type-safe monorepo framework (OpenAPI-to-TypeScript codegen, Vue/React templates, auth, payments).

FastAPI · Pydantic AI · SQLAlchemy · PostgreSQL · Redis · Vue · React · Next.js · TypeScript · Tailwind CSS · Docker

ohm.antonchaynik.ru

Open-source poker tracker — hand-history parsing, DuckDB analytics, and the stats and graphs the commercial tools keep behind a licence. Released for macOS and Windows.

Python · FastAPI · TypeScript · DuckDB

Production-planning ERP for a manufacturing company

Shift scheduling, order tracking and real-time dashboards. Running in production for years at under an hour of support per quarter.

FastAPI · PostgreSQL · Next.js · Docker