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Senior game developer with 17 years of experience shipping web, mobile, and PC titles, including 40+ commercial Construct projects. Strong ownership across prototype-to-production, with deep TypeScript/JavaScript expertise, Phaser, Spine animation integration, and performance optimization. Experienced in deterministic testing, reproducible gameplay architectures, and full-cycle feature delivery. Skilled in Construct-family workflows (event sheets, families, containers, functions, behaviors), responsive multi-input UI (mouse/keyboard/touch/controllers), and API/portal integrations with strong engineering practices (Git, code review, mentoring).…Senior game developer with 17 years of experience shipping web, mobile, and PC titles, including 40+ commercial Construct projects. Strong ownership across prototype-to-production, with deep TypeScript/JavaScript expertise, Phaser, Spine animation integration, and performance optimization. Experienced in deterministic testing, reproducible gameplay architectures, and full-cycle feature delivery. Skilled in Construct-family workflows (event sheets, families, containers, functions, behaviors), responsive multi-input UI (mouse/keyboard/touch/controllers), and API/portal integrations with strong engineering practices (Git, code review, mentoring).

Karol Furmann

Game Developer, Programmer, Web Developer, +2

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Senior game developer with 17 years of experience shipping web, mobile, and PC titles, including 40+ commercial Construct projects. Strong ownership across prototype-to-production, with deep TypeScript/JavaScript expertise, Phaser, Spine animation integration, and performance optimization. Experienced in deterministic testing, reproducible gameplay architectures, and full-cycle feature delivery. Skilled in Construct-family workflows (event sheets, families, containers, functions, behaviors), responsive multi-input UI (mouse/keyboard/touch/controllers), and API/portal integrations with strong engineering practices (Git, code review, mentoring).…Senior game developer with 17 years of experience shipping web, mobile, and PC titles, including 40+ commercial Construct projects. Strong ownership across prototype-to-production, with deep TypeScript/JavaScript expertise, Phaser, Spine animation integration, and performance optimization. Experienced in deterministic testing, reproducible gameplay architectures, and full-cycle feature delivery. Skilled in Construct-family workflows (event sheets, families, containers, functions, behaviors), responsive multi-input UI (mouse/keyboard/touch/controllers), and API/portal integrations with strong engineering practices (Git, code review, mentoring).

Available to hire

Senior game developer with 17 years of experience shipping web, mobile, and PC titles, including 40+ commercial Construct projects. Strong ownership across prototype-to-production, with deep TypeScript/JavaScript expertise, Phaser, Spine animation integration, and performance optimization.

Experienced in deterministic testing, reproducible gameplay architectures, and full-cycle feature delivery. Skilled in Construct-family workflows (event sheets, families, containers, functions, behaviors), responsive multi-input UI (mouse/keyboard/touch/controllers), and API/portal integrations with strong engineering practices (Git, code review, mentoring).

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Beginner

Language

Polish

Fluent

English

Advanced

Work Experience

Construct 3 Developer - Basketball Master 2 Port at Confidential client engagement

September 1, 2025 - October 31, 2025

Ported a commercial Construct 2 basketball game to Construct 3 and integrated a portal API. Leveraged deep Construct-family knowledge (event sheets, families/containers, functions/behaviors) to preserve gameplay behavior across a multi-platform distribution footprint and keep the title in circulation.

Lead Programmer at Confidential (Deckbuilder, on hold)

January 1, 2025 - January 1, 2026

Implemented core gameplay, UI and animation for a deckbuilder project using Phaser and TypeScript with an ECS-oriented approach. Designed deterministic RNG and lockstep-style replay architecture to ensure reproducible game sessions. Built unit tests and headless/no-view automated gameplay validation based on detailed design documentation, using iterative test/review/refactor workflows with Cursor and AI-assisted coding tools.

Lead Programmer at Cosmopirates (Commercial Steam title)

January 1, 2022 - June 30, 2024

Programmed the production codebase (~40k LOC) in a two-person team with a custom ECS. Supported 100+ cards, 100+ buffs, 26 ships and 35 items at stable 60 FPS on Windows/Linux. Integrated Spine skeletal animation and skins with advanced chained animation systems; implemented Steamworks features and 9-language localization. Used JSON-driven configs and deterministic/headless testing; released June 2024 to strong Steam results and broad demo distribution.

Independent / Contract Senior Game Developer at BlackMoon Design collaboration + direct clients

January 1, 2010 - Present

Delivered 40+ commercial games across web, Android/iOS, Smart TV and Steam (40+ Construct 2 projects). Built custom Construct JavaScript plugins for portal APIs, leaderboards, save/load, and third-party integrations. Owned features/projects end-to-end in small teams, including responsive UI and gameplay performance-sensitive implementations. Worked across builds and platform requirements, applying long-term engineering workflows and deterministic testing practices.