Тимофій

Tymofii Shchur
Backend Software Engineer
[open contact info](look above in the "contact info" section) | [open contact info](look above in the "contact info" section) | github.com/ashfromsky | [open contact info](look above in the "contact info" section) | Kyiv, Ukraine

PROFESSIONAL SUMMARY
Backend Software Engineer with a focus on System Architecture, API Design, and Computer Science fundamentals. Spe-
cializes in building high-performance infrastructure and developer tools using Python (FastAPI), Go, and C#. Experienced in
designing scalable distributed systems — from AI-driven testing platforms to secure financial transaction engines. Hands-on
implementation of Write-Ahead Logging (WAL), custom indexing structures, and concurrency models from scratch.

TECHNICAL SKILLS
• Languages: Python (Expert), C# / .NET, Go, C++, TypeScript, SQL
• Backend & Core: FastAPI, Django (DRF), Flask, .NET, AsyncIO, Multithreading, REST API Design
• AI & LLM: OpenAI API, Anthropic (Claude), Prompt Engineering, RAG (Retrieval-Augmented Generation)
• Databases: PostgreSQL (NeonDB, Supabase), MongoDB, Redis, MySQL, MS SQL, SQLite, Apache Cassandra, Vector DBs
• ORM & ODM: SQLAlchemy, SQLModel, Django ORM, Entity Framework Core, Motor (async MongoDB)
• DevOps & Cloud: Docker, GitHub Actions (CI/CD), Linux, Render, Railway, Heroku, Azure
• Tools: Git, Postman, Pytest, Supabase, Telegram API (Aiogram)
• CS Foundations: Algorithms & Data Structures, Database Internals (B-Trees, WAL, Indexing), System Design, Distributed
Systems Patterns

KEY ENGINEERING PROJECTS
Helix — AI-Powered API Mocking Platform GitHub
Python · FastAPI · Redis · Docker · LLMs (DeepSeek, Groq, Ollama)
• Engineered a smart mocking server that guarantees JSON Schema compliance via LLMs, solving deterministic test-data
generation at scale.
• Designed a Strategy Pattern architecture with pluggable AI providers (Groq, DeepSeek) and offline local inference via Ollama
— zero vendor lock-in.
• Integrated Redis caching to reduce repeated semantic query latency and cut AI token costs.
• Built a Chaos Engineering module to simulate configurable network latency and random failures for resilience testing.

AcquireMock — Financial Payment Gateway Simulator GitHub
Python · FastAPI · SQLModel · PostgreSQL / AsyncPG · Cryptography
• Implemented a full transaction lifecycle simulator (Invoice → OTP → Webhook) for payment integration testing.
• Applied Idempotency Keys to guarantee exactly-once processing semantics in distributed environments.
• Secured webhook delivery with HMAC-SHA256 signatures and built a retry engine with exponential backoff.
• Stored sensitive card data with bcrypt hashing, mirroring PCI-DSS compliance requirements.

YaraDB — Custom In-Memory Database Engine GitHub
Python · Algorithms · Data Structures
• Built a NoSQL engine from scratch to study DBMS internals end-to-end.
• Implemented Write-Ahead Logging (WAL) for crash recovery and durability guarantees.
• Designed dual indexing: Hash Index O(1) for exact lookups and B-Tree Index O(log n) for range queries.

Gitra — Local AI Code Explorer GitHub
Python · Google Gemini API · RAG (Retrieval-Augmented Generation)
• Built a RAG-powered tool for analyzing local Git repositories, enabling natural-language Q&A over complex codebases.

EXPERIENCE
Freelance Backend & Automation Engineer Remote
Python / Telegram API Developer 2023 — Present
• Designed and deployed custom automation bots for business clients using Python (Aiogram framework).
• Integrated payment systems (Stripe and local Ukrainian providers) and third-party REST APIs for automated order processing
pipelines.
• Owned the full development lifecycle: requirements gathering, implementation, deployment (Linux servers, Render, Railway,
Heroku), and post-launch maintenance.
EDUCATION
IT Step Academy Kyiv, Ukraine
Diploma in Software Development 2022 — 2026
Romano-Germanic Lyceum 123 › Kyiv, Ukraine
Specialized Secondary Education — Mathematics & Languages Graduating May 2026

LANGUAGES & INTERESTS
• Languages: English (B2 Upper-Intermediate), German (B2 Upper-Intermediate), Ukrainian (Native), Russian (Native)
• Interests: Competitive Alpine Skiing, Drumming & Music Production, PC Hardware Engineering