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Bohdan Hulko
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Warsaw, Poland

About me
Python Backend Developer with over a year of commercial experience working on backend systems for
crypto analytics products. Contributed to backend services responsible for market data processing, trading
signal generation, analytical calculations, and automated execution workflows. Strong experience in
translating business and analytical requirements into backend features, optimizing data-heavy and latency-
sensitive parts of services, and working in production development processes.

Work experience
July 2025 -
Now Sobek – Backend Developer
10 months

- Translated high-level business and analyst requirements into backend features,
collaborating with developers and analysts; delivered changes through GitHub pull
requests, CI checks, and intra-team code reviews..

- Built FastAPI trading-signal services that productionized ML models and analyst
scripts; optimized compute-heavy paths, processed market data from ClickHouse,
stored signals in MongoDB, and exposed REST and WebSocket streams for execution
consumers.

- Implemented historical and real-time market-data ingestion pipelines, normalizing
multiple external API formats into unified ClickHouse schemas and applying fast, low-
latency processing and storage logic.

- Contributed signal-processing business logic for an automated execution service
including incoming signal validation, user strategy handling, and routing approved
signals into Binance and Bybit order-placement flows.

- Prepared services for deployment to Kubernetes on AWS by writing Dockerfiles and
aligning runtime configuration, networking, and logging requirements with DevOps.

- Investigated logs using Elasticsearch to identify bottlenecks, then optimized affected
code paths to reduce signal-processing latency and improve runtime stability.

January 2025 – Oracul Analytics – Python Backend Developer
June 2025
6 months
- Implemented multiple Python 3.13 microservices following DDD and CQRS patterns,
interacting with internal services via gRPC and external REST APIs to implement
domain logic, aggregate and transform data, perform business calculations, and store
read-side projections in MongoDB or PostgreSQL for low-latency access.
 - Extended a FastAPI gateway by integrating internal services over async gRPC and
expanding the Strawberry GraphQL schema with typed queries and subscriptions, that
mapped protobuf responses and streams into GraphQL models for the frontend.

- Developed and optimized analytical SQL queries over large blockchain datasets in
ClickHouse and TimescaleDB, applying time-window filters, CTEs, joins, and targeted
aggregations while narrowing scanned ranges and restructuring logic to improve query
performance and reduce resource usage.

- Worked in a backend team following Scrum using Jira: participated in sprint planning
and daily stand-ups, implemented tasks via GitLab merge requests, ensured CI/CD
pipeline compliance, and iterated on code based on review feedback

Education
2023-2027 University VIZJA in Warsaw
B.Sc in Computer Science

Relevant coursework:
Database Systems, Software Engineering, Algorithms and Complexity, Machine
Learning, Mathematics for Computer Science

Skills
Languages Ukrainian — Native
Russian — Native
English — B2
Polish — B2

Technical skills Python3.X, SQL, FastAPI, ClickHouse, PostgreSQL, TimescaleDB, MongoDB, Redis,
gRPC, GraphQL, GitHub, GitLab, Docker / Docker Compose, Cursor, Claude Code