Максим

MAKSYM BILETSKYI
Systems Analyst · Full-Stack Developer
[open contact info](look above in the "contact info" section) · [open contact info](look above in the "contact info" section) · Lviv, Ukraine · Remote

PROFESSIONAL SUMMARY
Full-stack software engineer with 5+ years of commercial experience in backend development, REST API design, and
system integration. Production experience deploying and integrating LLMs; strong SQL and database background
across PostgreSQL, MySQL, MongoDB. Comfortable bridging technical and business requirements — translating
stakeholder needs into clear technical specifications. Background in UK public sector, fintech, and SaaS environments
with strict data protection and correctness requirements. MSc in Computer Science (AI specialization).

CORE SKILLS
Databases PostgreSQL, MySQL, MongoDB, Redis, ElasticSearch — query design, optimization,
administration
REST API API design and implementation (Rails, Flask, FastAPI) — 5+ years commercial experience
Backend Ruby on Rails, Python (Flask, SQLAlchemy), background workers, microservices
Networking TCP/IP stack, HTTP/HTTPS, proxies, REST protocol design, network interaction in Python
Security Data protection (UK GDPR), secure API design, correctness-critical fintech systems
AI / LLM Anthropic Claude API, OpenAI API (Azure), prompt engineering, production LLM deployment
Frontend React, Vue.js, Hotwire/Stimulus, TypeScript, Tailwind CSS
Infra AWS, Azure, CI/CD, Git, Docker (basics)
Languages Ukrainian (native), English (technical documentation, business communication)

PROFESSIONAL EXPERIENCE

Full-Stack Developer · CPOMS Oct 2024 – Present | London, UK · Remote
▸​ Led V2 API implementation for a UK public sector platform — end-to-end data flow design, cross-team
requirements gathering, technical specification and delivery
▸​ Deployed and owned production LLM integration (Anthropic Claude API) — full cycle: requirements, architecture,
prompt engineering, backend, frontend
▸​ Authored technical specifications and API documentation coordinating across backend, frontend, and QA teams
▸​ Delivered secure solutions under strict UK data protection requirements; diagnosed complex cross-service defects
in a high-reliability environment

Full-Stack Developer · Socialsuite Oct 2022 – Oct 2024 | Melbourne, AU ·
Remote
▸​ Core developer on a greenfield Rails 7+ product — participated in architecture decisions, AWS infrastructure,
CI/CD pipeline design
▸​ Integrated OpenAI API for production LLM features; designed and documented API contracts between services
▸​ Took end-to-end ownership of features: requirements analysis → technical design → implementation → testing
coordination

Full-Stack Developer · PAIR Finance Oct 2021 – Oct 2022 | Berlin, DE · Remote
▸​ Built features in a fintech platform handling sensitive financial data — correctness-critical, regulated environment
with strict compliance requirements
▸​ Led migration from Rails templates to Vue.js; responsible for technically sensitive document template development
with legal implications

Developer / Data Science Trainee · Teamvoy May 2020 – Oct 2021 | Lviv, Ukraine
▸​ ElasticSearch optimization for large-dataset CRM search; Python/SQLAlchemy automation for database
maintenance
▸​ Flask service development for data search and manipulation; REST API design for internal integrations

EDUCATION
MSc Computer Science (AI specialization) · Lviv Polytechnic National University · 2022–2023
BSc Computer Science (AI Department) · Lviv Polytechnic National University · 2018–2022