Rostyslav

Rostyslav Tarasov
Backend Developer | Python · FastAPI · PostgreSQL
Germany · Remote | [open contact info](look above in the "contact info" section) | LinkedIn | GitHub | Portfolio

PROFILE
Backend-focused Software Engineering student with paid production development experience. I build APIs and backend workflows
around PostgreSQL, authentication, async processing, reliability, testing, and deployment. Currently also building with Java and Spring
Boot.
SELECTED HIGHLIGHTS
• Built a concurrency-safe delivery worker using PostgreSQL FOR UPDATE SKIP LOCKED, retry/backoff logic, and stale-job recovery.
• Implemented session-based authentication, password hashing, workspace ownership, and authorization boundaries.
• Shipped paid production web projects; one e-commerce checkout had processed ~225 real orders by Oct 2026.
BACKEND PROJECTS
Ackvia — Lead Capture & Delivery Platform
Python · FastAPI · PostgreSQL · SQLAlchemy · asyncpg · Alembic · Docker · GitHub Actions · GitHub
• Built a backend that accepts website form submissions, persists them in PostgreSQL, and delivers them to Telegram through a
background worker.
• Made job claiming safe under concurrency with PostgreSQL SELECT ... FOR UPDATE SKIP LOCKED; added retryable/permanent
failure handling, exponential backoff, manual replay, and stale-work recovery.
• Implemented Argon2 password hashing, opaque session tokens, workspace membership, and ownership checks.
• Added PostgreSQL-backed automated tests and CI for auth, ingestion, delivery transitions, replay, worker behavior, and recovery.
API Notes — Authenticated REST API
Python · FastAPI · PostgreSQL · SQLAlchemy · Alembic · JWT · pytest · Docker · GitHub
• Built an async PostgreSQL REST API with migrations, validation, registration/login, JWT auth, user-scoped authorization, and automated
tests; resolved recursive response-validation issues in nested task/tag models.
ReFind — Lost-and-Found Platform
5-person team · Node.js · Express · PostgreSQL · OAuth2 · Socket.IO
• Contributed to REST/API work, PostgreSQL-backed features, Facebook OAuth, and real-time communication in a shared team codebase.
COMMERCIAL EXPERIENCE
Contract Web Developer — Remote | Jan 2026 – Aug 2026
Divide Energy — Next.js, TypeScript · divideenergy.com.ua
• Delivered a production e-commerce frontend integrated with a separate backend API: catalog, cart, checkout, authentication, and admin
flows.
• Supported the product after launch; the implemented checkout had processed approximately 225 real orders by Oct 2026.
eRecovery — Tailwind CSS · landing-erecovery.vercel.app
• Delivered a responsive production landing page from Figma and completed multiple rounds of fixes before handoff.
SKILLS
Backend: Python, FastAPI, REST APIs, async programming, authentication/authorization, Java, Spring Boot
Database: PostgreSQL, SQL, SQLAlchemy, asyncpg, Alembic, transactions, indexes, constraints, JSONB, row locking
Testing & Dev: pytest, Testcontainers, Docker, Docker Compose, GitHub Actions, Git, Linux
Additional production experience: TypeScript, Next.js, React
B.Sc. Software Engineering Languages
Kharkiv National University of Radio Electronics (KhNURE) Ukrainian — Native · Russian — Fluent
Sep 2023 – Jun 2027 (expected) English — B2 · German — A1

Rostyslav Tarasov · Backend Developer