Костянтин

KOSTIANTYN YERIN

Technical QA Tester | Game Systems & Technical Designer

Bucharest, Romania | [відкрити контакти](див. вище в блоці «контактна інформація») | [відкрити контакти](див. вище в блоці «контактна інформація»)

LinkedIn: [відкрити контакти](див. вище в блоці «контактна інформація») | Portfolio: Notion Portfolio Workspace

SKILLS

• Technical QA & Tools: Functional, Regression & UI/UX Testing, Bug Lifecycle (Jira), Compliance &
Asset Review, Python (Requests/BS4), REST APIs.
• Game & Tech Design: Node Graphs (Visual Scripting), Event-Driven Architecture, FSM, Entity
Optimization & Object Pooling, Lua, XML Data Setup.

EXPERIENCE

Game QA Tester (NDA Protected) | Major Game Development Studio | Jan 2026 – Present

• Execute functional, regression, UI, and integration testing on live builds under strict NDA.
• Isolate and document physics breaks, desyncs, and complex edge cases via internal bug trackers.
• Audit game assets, level logic, and UGC systems against design docs and technical compliance
rules.
• Collaborate directly with engineers to optimize reproduction pipelines and validate player UX.

Technical Designer & UGC Developer | Independent / Modding | Oct 2025 – Present

• Gameplay Systems: Built competitive and rogue-lite modes (Survivor's Throne, Hook Wars,
Alchemy's Curse) featuring trajectory physics, custom HUDs, and meta-progression.
• Optimization: Refactored spawner logic from polling to event-driven execution, eliminating lag spikes
under engine entity bottlenecks (up to 1,000 entities).
• Modding & Scripting: Authored modular Lua scripts and XML databases for custom NPC behaviors,
reactive dialogue trees, and combat tuning in S.T.A.L.K.E.R. Anomaly.
• Dev Tools: Built Python scrapers to convert doc tables into structured JSON/CSV datasets;
developed an internal context-aware Gemini API tool for documentation chunking.

Esports Analyst & Coach | Independent | Oct 2020 – Present

• Analyzed tactical shooter macro loops, TTK balance, player decision trees, and engagement
heatmaps to formulate data-driven competitive balancing frameworks.

AWARDS & RECOGNITION

• Silver Award — HoYoverse UGC Guide Contest (Sep 2026): Engine optimization & zero-lag spawner
logic.
• Bronze Award — HoYoverse UGC Guide Contest (Aug 2026): Data-driven game loops & entity
management.
• Outstanding Works Prize — HoYoverse UGC Guide Contest (Jul 2026): Complex node logic
breakdown.

EDUCATION & LANGUAGES

Kharkiv State Academy of Physical Culture: Bachelor's in Esports Coaching & Analytics (Defense:
98/100, 2025)

Languages: English (Professional Working / B2), Ukrainian (Native), Russian (Native)