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unsound-mint/README.md

Hi, I'm Denis 👋

Backend and full-stack engineer and Computer Science student at Nazarbayev University (class of 2027), based in Astana, Kazakhstan (UTC+5). I build production systems end to end, from the database schema to deployment and monitoring, and I run two of them in production today.

Looking for backend (Go), DevOps/SRE and full-stack (TypeScript/Next.js) roles and internships, remote or in Astana.

In production

  • Happy End: e-commerce platform with ~7,000 monthly users, which I develop on my own. I moved it from 1C-Bitrix to Next.js + PostgreSQL + a PHP API, with Halyk Bank online payments, analytics in BigQuery and 3,700+ automated tests.
  • City news platform: a multi-tenant platform for two city portals that I built alone. Go API, PostgreSQL with row-level security and hybrid search, Kaspi Pay webhooks, CI/CD with automatic rollback, Prometheus/Grafana/OpenTelemetry.

Projects
payhook Payments and webhooks service in Go: idempotent API, signed webhooks, transactional outbox to NATS JetStream, retries with dead letters. Helm chart tested on kind in CI; zero failed requests during a rolling restart under load.
payhook-infra Terraform for payhook on AWS: VPC, ALB + Auto Scaling, RDS, Secrets Manager, CloudWatch alarms, GitHub Actions deploys through OIDC, terraform test, tflint, Trivy.
MusicRoomBot Telegram booking bot for NU's Music Room, used by ~200 students since December 2025 (slots usually fully booked). Async Python, PostgreSQL constraints and advisory locks against double booking, Alembic, CI.
water-meter-anomaly-detection Anomaly detection in water-meter consumption data.
nuclear-morphometry GPU pipeline for 2D/3D analysis of cell nuclei from confocal microscopy (Cellpose-SAM, PyTorch, Polars).

Stack

Go · TypeScript / Next.js / React · PHP · Python · PostgreSQL · Redis · NATS · Docker · Kubernetes (Helm) · Terraform · AWS · GitHub Actions · Prometheus · Grafana · OpenTelemetry · Cloudflare · Linux

I also do research at NU: high-performance Julia pipelines for large 3D astronomical datasets on the university HPC cluster.

Contact

LinkedIn · denisxandreyev@gmail.com · English C1, Russian native

Pinned Loading

  1. MusicRoomBot MusicRoomBot Public

    Telegram booking bot for Nazarbayev University's Music Room, used by ~200 students since Dec 2025: no double-booking, location check-ins, reminders. Async Python, PostgreSQL.

    Python

  2. payhook payhook Public

    Payments & webhooks service in Go: idempotency, signed webhooks, transactional outbox to NATS JetStream, retries with dead letters

    Go

  3. payhook-infra payhook-infra Public

    Terraform for payhook on AWS: VPC, ALB + Auto Scaling, RDS, Secrets Manager, CloudWatch alarms, GitHub OIDC deploys, terraform test, tflint, Trivy

    HCL