Kraków, Remote, Hybrid, PolandAvailable to work with your teamMobile F2P / Hybrid-casual / Gameplay / Unity / AI

Lead Senior Game Developer / technical leader

I build mobile games,
virtual experiences
& tech teams.

I take games from first prototype to live product — owning core gameplay, iteration speed and the team that ships it.

Portrait of Mikołaj Musialik

Lead Senior Game Developer and Technical Team Leader focused on mobile, PC and hybrid-casual games: core gameplay and game feel, rapid prototyping, live-game development, technical architecture and team building.

7+Years in game development
10+Shipped games on Mobile, Web, PC and XR
Unity / C# / AI / JiraCore development stack
Core Gameplay & ArchitectureFocus
Collage of mobile games showing four colorful gameplay scenes and their game artwork
01

Mobile / Gamedev / Multiplayer / R&D

Mobile Games

Development across more than a dozen mobile games - from new productions and platform ports to maintenance and the continued development of live multiplayer titles, including Hunt Royale RPG, with over 15 million downloads.

Role
Game Developer / Team Lead / Architect
Platforms
Mobile (iOS / Android / Switch / HarmonyOS)
View case study
Collage of four Meta game experiences featuring colorful characters and environments
02

Meta / Gamedev / AI / XR

Meta Games

Partnered closely with Meta on the development of Meta Horizon Engine, a Unity-based platform, and built experiences showcasing its capabilities. Helped build Meta Horizon Studio, a new AI-powered engine, while developing tools and workflows for the future of game development.

Role
Team Pod Lead / Game Developer / Engine Developer
Platforms
Mobile / AR / VR / PC / Web
View case study
Person wearing a mixed-reality headset interacting with a virtual fire scenario in a living room
03

Mixed Reality / Healthcare / AI

CXRT

A working mixed-reality exposure therapy platform currently used by partner hospitals for clinical validation. It combines more than 10 therapeutic scenarios, a cross-platform therapist controller and a complete session-analysis dashboard.

Role
Lead Developer / Product Architect
Platforms
Meta Quest 3 / Apple Vision / iOS / Android
View case study
Winter Survival, Railbound and Hoomanz game artwork
04

Guest Performances / Consultancy / QA

Guest Performances

Guest contributions across several released titles, supporting teams through QA, development consultancy and focused feature work that added extra content and polish to each game.

Role
Game Developer / QA / Consultant
Platforms
Consoles / PC / Mobile
View case study
Roblox experiences including Hoomanz Airport, Bricks Wars, Waterpark Rumble and Delivery Rush
05

Multiplayer / Gamedev / Production Pipeline

Roblox Experiences

Designed and built an end-to-end production workflow that enabled the team to create new Roblox experiences for clients, then led the delivery of a series of releases enjoyed by players around the world.

Role
Architect / Lead Developer
Platforms
Roblox
View case study
Unreal game worlds with a Work in Progress bannerMore Info Soon
06

Unreal / Gamedev / Multiplayer / Consultancy

Unreal Games

Three original Unreal Engine projects: Rage Walker, an Indiana Jones-inspired rage game; Casual Tank, a multiplayer tank game inspired by Battle City; and Decay Strain: The Timekeeper, a steampunk horror title. Developed independently or in small teams, the projects deepened hands-on expertise across the Unreal platform.

Role
UE Developer / Consultant / Technical Support
Platforms
PC / Mobile

From first risk
to reliable system.

01Core gameplay & game feel

Building and tuning core loops, controls, pacing and feedback so a game feels good from the first minute and gives players a reason to come back. Designing maintainable gameplay systems and editor tooling that keep iteration cheap as mechanics grow.

02Rapid prototyping & iteration

Validating the riskiest assumptions early with fast prototypes, making clear go / no-go calls and evolving what works toward production. Using product analytics and playtests to decide what to change next. Hands-on use of Adobe Creative Cloud and Blender lets me support art and UI when the team needs it.

03Team leadership & ownership

Owning goals and priorities for small multidisciplinary teams, mentoring developers and keeping engineering, design and art aligned on one product direction. Streamlining the team's iteration process so ideas reach players faster.

04Technical architecture

Turning product constraints into scalable boundaries, interfaces and delivery plans.

05Cross Platform Development

Developing and shipping reliable games across mobile, PC, XR hardware and console platforms.

06AI Adoption & Agentic Systems

Designing and validating reliable agentic workflows, diagnosing orchestration failures, and helping cross-disciplinary teams adopt AI through practical, production-ready integrations.

Experience

PeriodCompanyPositionScope
2026 -MiJaMedLead Developer / Product ArchitectCross-platform, healthcare, architecture
2023 -KoffecupPod Lead DeveloperMeta, architecture, cross-platform
2021 - 2022BoomBitSenior Unity DeveloperUnity, mobile, gameplay
2019 - 2021Cubeloop TeamTeam Leader / Lead DeveloperUnity, cross-platform, architecture
2020 - 2021A-Lan TechnologyIT Specialist / Junior DeveloperWeb apps, e-commerce, B2B
2018 - 2020Panopticon FilmsStream VisionVisual Creator / Film MakerFilm creation, postproduction
2017 - 2018VideoTesty.plDeputy Chief EditorManagement, video, B2B
For a detailed professional background, get in touch→

Talks

DatePlaceSubject
2023Hackerspace Game JamHow to improve the prototyping process in Unity - Case Study
2022Digital DragonsHow to level up your prototypes in Unity
For speaking opportunities and knowledge sharing, get in touch→

Education

PeriodInstitutionProgrammeFocus
2026 - PresentHarvard Business SchoolCertificate in Leadership PrinciplesLeadership, Team Management, Decision-Making
2024 - 2026Jagiellonian UniversityMaster of Engineering - Computer Game ScienceGame Development, Programming, B2B
2017 - 2022DSW IDEISBachelor of Engineering - Computer Science and EconometricsGame Development, Programming, IT
For more details about my academic background, get in touch→

Certificates

Type

MTA 98-361

Certificate

Software Development Fundamentals C#

Type

MTA 98-364

Certificate

Database Fundamentals

Type

MTA 98-375

Certificate

HTML5 Application Development Fundamentals

Type

MOS 77-725

Certificate

Microsoft Office Word: Core

Tools are
part of the
decision.

Core
Unity / C# / UE / AI / Architecture / XR
Platforms
Android / iOS / PC / Consoles / Meta / Roblox
Additional
C++ / TypeScript / Flutter / GitHub Actions / Adobe / Blender
Workflow
Git / Code Review / CI/CD / Agile / Technical Documentation

Engineer.
Architect.
Team lead.

I am a Lead Senior Game Developer and Technical Team Leader focused on building reliable gameplay, AI and XR systems. My work combines hands-on development, technical architecture, product thinking and team leadership.

I am most effective in projects that require transforming an early concept into a working, scalable product, establishing strong technical foundations and helping multidisciplinary teams deliver complex interactive experiences. I also help teams adopt AI in practical, production-ready ways and optimize everyday workflows. A broad working knowledge of engineering, creative and content-production tools lets me contribute across disciplines and connect technical decisions with the wider product pipeline.

Kraków, PolandAvailable to work with your team

Let's build
something that
actually works.

For collaboration, lead and senior development roles, technical leadership, mobile, PC or AI-related projects, and speaking engagements, contact me directly.