UE5 Network Replication Senior Programmer

About the project:
We’re building a competitive, fast-paced multiplayer shooter in Unreal Engine 5, focused on tight controls, minimal latency and smooth replication. If you love squeezing every millisecond out of netcode, you’ll feel right at home.

What you’ll do:
Implement & optimize gameplay systems in C++ and Blueprints for a TPP title
Handle multiplayer replication, client prediction, rollback, hit-registration, authoritative server logic, using GAS in Lyra framework
Profile & optimize network performance (bandwidth, packet ordering, jitter, latency spikes)
Collaborate cross-disciplinarily with design, art and animation to iterate quickly on new features
Mentor & code-review other engineers
Coordinate with backend & DevOps teams to ensure scalable, secure, and fault-tolerant services

Must-have experience:
Good knowledge of Unreal Engine 5 internals (Replication Graph, Gameplay Ability System / Lyra frameworks)
Battle-tested experience with Character Movement Controller for competitive multiplayer
3-plus years of professional C++ in game-play engineering
At least one shipped AA or AAA multiplayer game (PC / console) with client-server architecture
Hands-on debugging of latency, desync, and tick-rate issues in live environments.
Fluent English; comfortable working in a distributed, multicultural team

Bonus points:
Experience with ranked / e-sport titles, anti-cheat or authoritative networking models
Passion for competitive shooters (tell us which titles!)
Why Lobah?
Work wherever you like: at home or in the office in Poland, Warsaw
Small, senior team: your decisions have an immediate impact.
Competitive salary
20 paid days off

In your application, please include answers to the following questions [simple yes/no]. Please read the questions carefully.

• Have you shipped at least one PC or console shooter that uses a dedicated authoritative server (client–server, not peer-to-peer)?
• Have you debugged CharacterMovementComponent desync or rubber-banding using Unreal’s built-in Network Profiler (Stat Net, PacketAnalyzer, etc.)?
• Have you ever implemented rollback or server-side rewind that accommodates > 150 ms round-trip latency?
• In a live, competitive e-sport title, would you disable server authority and allow the client to resolve authoritative hit-registration?
• Would you ship a competitive shooter where high-frequency player-movement updates were sent via reliable RPCs?