Senior Client Platform Developer

About us

Hacksaw Studios is a Stockholm-based game studio focused on creating innovative, high-quality gaming experiences. With a strong emphasis on performance, reliability, and precision, we bring ideas to life through deep technical expertise and close creative collaboration. We have wide distribution, and our games are played by millions of people every month by players all over the world.

We are now looking for a Senior Client Platform Developer to join our growing Stockholm team. In this role, you will take a leading technical responsibility for our client-facing platforms and tools, helping shape architecture, drive best practices, and ensure a high-quality experience for players and internal teams.

The Role

Your key responsibilities include:

Technical Ownership & Architecture

Own and evolve core client-side platform components, including in-game UI systems and client-communication layers.

Contribute to architectural decisions around scalability, maintainability, and long-term platform strategy.

Identify technical debt and proactively drive improvements and refactors.

Platform Integration & Cross-Team Collaboration

Lead and design client-side integrations between our games, external platforms, and third-party studios using our OpenRGS platform.

Act as a technical partner to backend teams, ensuring coherent end-to-end platform architecture.

Provide guidance and best practices for external studios integrating with our platform.

Tooling, Automation & Developer Experience

Design, build, and maintain internal tooling (e.g. mock clients, launchers, automation scripts, CI helpers) to improve developer productivity and reliability.

Advocate for better workflows and testing strategies.

Technical Leadership & Support

Serve as a go-to expert for complex platform-related issues, supporting developers, QA, and tech support.

Drive root-cause analysis of production issues and help define preventative measures.

Mentor less-experienced developers through code reviews, technical discussions, and knowledge sharing.

UX & Quality Focus

Ensure high-quality user experiences by balancing technical constraints with UX and visual polish.

Collaborate with designers and product stakeholders to ensure robust and user-friendly client solutions.

What We're Looking For:

Senior-Level Experience

Several years of professional experience developing complex web or client-side applications in production environments.

Proven ability to take ownership of systems and make sound technical decisions with long-term impact.

Strong Technical Foundation

Deep proficiency in JavaScript/TypeScript or similar languages.

Solid understanding of modern web technologies, including browser APIs, cross-origin communication (postMessage, CORS), WebSockets, and real-time client-server communication.

Problem Solving & Debugging

Advanced debugging skills using browser DevTools, network inspection, and API tools (Postman or equivalent).

Ability to reason about complex distributed systems and client-server interactions.

Communication & Collaboration

Comfortable explaining technical concepts and trade-offs to both technical and non-technical stakeholders.

Experience working cross-functionally and influencing decisions beyond your immediate team.

Ownership Mindset

Proactive, service-minded, and comfortable driving initiatives independently.

Willing to challenge existing solutions and suggest improvements when appropriate.

Nice to Have:

Experience with Haxe.

Experience with UX and UI design.

Experience with Git, TypeScript, React, Linux, Bash, npm, Bun, Docker, Cucumber, GitLab CI, and AWS.

Experience working with web-facing C# systems.

Previous experience in platform teams, SDK development, or supporting external developers.

What We Offer

A modern office in central Stockholm.

Work with experienced, passionate colleagues in the gaming industry.

The opportunity to create games with a global audience.

Real influence, ownership, and personal growth opportunities.

Wellbeing perks including wellness allowance and regular in-office massage.

Practical Details

This is an on-site position in Stockholm.

Unfortunately, we cannot assist with relocation or visa sponsorship.

Ready to Join the Game Makers?

Apply now! We review applications on a rolling basis.