Senior Client Platform Developer
Hacksaw Studios AB · Stockholm · Tills vidare · Deadline 2026-11-30
Hacksaw Studios AB is seeking a **Senior Client Platform Developer** for an **on-site position in Stockholm**. In this role, the developer takes technical ownership of client-facing platforms, in-game UI systems, and client-communication layers. Duties include designing client-side integrations with external platforms and third-party studios using the OpenRGS platform, collaborating with backend teams on end-to-end architecture, and developing internal developer tooling such as mock clients, launchers, and automation scripts. The position also entails providing technical leadership, resolving complex production issues, and mentoring team members. Candidates must have several years of professional experience developing complex web or client-side applications in production, alongside proven experience taking ownership of systems and architectural decisions. A **strong foundation in JavaScript or TypeScript** (or similar languages) is required, as well as solid knowledge of modern web technologies such as browser APIs, cross-origin communication, WebSockets, and real-time client-server communication. Applicants need advanced debugging skills and cross-functional communication abilities. Beneficial assets include experience with Haxe, UX/UI design, platform teams or SDK development, web-facing C# systems, and tools such as React, Docker, GitLab CI, and AWS. The employer cannot provide visa sponsorship or relocation assistance.
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.