Full‑stack developer · DevOps engineer · System designer
I build production systems end‑to‑end — from a pixel in React to a Postgres index, from a Dockerfile to a Grafana dashboard, from a JWT to a CI pipeline that ships it all.

• Full‑stack engineer with a strong DevOps / SRE bias — I don't just write code, I make sure it runs, scales, observes itself and recovers.
• Comfortable across the whole stack: frontend, backend, mobile, databases, infrastructure, CI/CD, monitoring, logging, backups, security.
• Polyglot — Python, TypeScript, Swift, Kotlin, Go, Java, C/C++ and more; I pick the right tool for the job.
• On GitHub since 2021 — shipping real products, not tutorial repos.
• Currently building Watermelon Messenger — self-hosted real-time messenger in production.
• Work solo and in teams (open source & university projects).
• Based in Russia, SSTU (Saratov State Technical University).
• Focus: production systems, clean architecture, observability, reliable releases.

• Architecture styles: microservices, modular monolith, event‑driven, CQRS, layered / clean / hexagonal.
• API design: REST, GraphQL, gRPC, WebSockets, OpenAPI / Swagger contracts.
• Data: relational schema design, indexing, query tuning, migrations (Alembic), caching strategies (Redis, CDN).
• Reliability / SRE: SLO/SLA mindset, structured logging, metrics, tracing, alerting, runbooks, post‑mortems.
• Security: JWT, OAuth 2.0, password policies, OTP flows, rate limiting, audit log, secrets in Vault / env, TLS everywhere.
• Methodologies: Agile / Scrum / Kanban, code review culture, trunk‑based & GitFlow when it fits.
• Testing: unit / integration / e2e, contract testing, load testing, CI gating.
• Infrastructure as Code & GitOps: Terraform, Ansible, Docker Compose, Helm, ArgoCD.
• DevSecOps: image scanning (Trivy), static analysis (SonarQube), dependency audits, secret management.

• Design and ship production‑ready microservice systems with FastAPI / Bun + Elysia / Node / Spring + PostgreSQL + Redis behind NGINX or Traefik.
• Build real-time messaging platforms with WebSockets, Redis Pub/Sub, append-only message stores (ScyllaDB), private S3 media and server-side encryption.
• Architect frontends in React + Vite / Next.js with router‑based auth, role‑based access, OTP flows, PWA and fully responsive UI.
• Set up the full Docker Compose / Kubernetes stack: app services, DBs, S3‑compatible storage, reverse proxy, TLS via Let's Encrypt.
• Wire up observability from scratch: Prometheus exporters, custom app metrics, Grafana dashboards via provisioning, Alertmanager rules.
• Build centralized logging with Filebeat → Elasticsearch → Kibana (or Loki + Grafana) with prebuilt dashboards.
• Implement automated backups (Postgres + S3 + ontology) and ship them off‑site to Google Drive over OAuth.
• Build CI/CD pipelines with GitHub Actions / GitLab CI / Jenkins: tests, lint, security scans, container builds & publishes, deploys.
• Implement secure auth flows: JWT, OAuth 2.0 (Yandex ID), password hashing, OTP password reset over email, rate limiting, full audit log.
• Integrate with SMTP, Telegram bots, Google APIs, YooKassa, Stripe, OpenAI — including proxying outbound traffic when the host is restricted.
• Work with semantic data / OWL ontologies for structured knowledge modeling.
• Build and ship native iOS / macOS (SwiftUI) and Android (Kotlin / Jetpack Compose) clients.

Live: watermelon-messenger.ru — self-hosted real-time messenger I design, build and operate end-to-end:

Related repos: watermelon-ios · watermelon-android

Production‑grade yoga asana catalog — multi‑service platform I designed and built end‑to‑end:

• Film review sentiment / analysis pipelines
• Time‑series & market data APIs
• Python stack for experiments and production scripts

• Telegram — @platinum_watermelon (fastest reply)
• Email — [email protected]
• GitHub — Pwatermelon

_{Always open to interesting projects and complex systems. If you build something cool — let's talk.}