Software Developer – Media Player

Vertiseit powers digital in-store and restaurant experiences for global enterprise brands through its business brands Grassfish, Visual Art and Scala. We are hiring a Software Developer for the team that builds Vertiseit's shared media player, the client software running on every deployed screen across the group.
The recruitment is handled by Lynqa. You will be employed directly by Vertiseit.
The product
The media player is a standalone application that plays media, runs local HTML5 experiences and exposes APIs to hardware integrations.

About 90% shared logic in TypeScript and JavaScript: playback, scheduling, state and rendering.
About 10% platform adapters: direct integration with the manufacturer APIs on Samsung Tizen and LG webOS, and a lightweight host app written in Go on Windows, Linux and Android.
IXM Player is already running in production across multiple operating systems and hardware platforms, with support continuously expanding.
Stack: TypeScript (web app and Node.js server), JavaScript, Svelte, Vite, Vitest and Playwright (automated E2E tests against physical displays). The host app is written in Go.
What you will do
The coming year is mostly new development to widen platform support, with Android as the main focus.

Develop and maintain the core player runtime in TypeScript
Port the player to new operating systems and display hardware
Keep playback stable 24/7, also with frequent content changes
Debug edge cases across the browser runtime, operating system, network and physical display
Validate manufacturer firmware updates and keep older Chromium runtimes and hardware working
Take your turn on weekly developer support during office hours, resolving incoming issues so the rest of the team can focus. No on-call.
Who we are looking for
You do not need a background in digital signage. What matters is solid TypeScript and an understanding of how code behaves on real, constrained devices. Customers run the player for many years, sometimes on older displays and Chromium versions.
The product spans playback, rendering, a Node.js server, networking and communication with hardware, so the team needs broad generalists who like to learn. It is not a low-level embedded or firmware role, and it is not pure web development. It sits in between: application development that has to work on many devices and operating systems.
Requirements
Solid professional experience with TypeScript and JavaScript, ideally several years
Experience with Node.js and at least one frontend framework
Experience working in an established, long-lived product and codebase
Experience with Smart TV apps or video and media players
Understanding of browser engines (Chromium/WebKit), runtime constraints, and resource optimization across platforms
Professional English (Swedish is a bonus)
Nice to have
Media playback, streaming, codecs or hardware-accelerated rendering
Multi-platform desktop or mobile apps, for example Android apps across many devices
Android, Linux (especially NixOS), ARM or x86
Svelte or Go
Firmware updates, compatibility testing and long backward compatibility
Networking, certificates and Windows services
Hardware protocols such as RS232 or HDMI-CEC
Profiling, observability and memory leak diagnosis
The team
You will join IXM Grid, a cross-functional team of 13 led by the Head of IXM Grid: two Product Owners, a QA Engineer, six backend developers and three media player developers, including the Lead Media Player Developer. Eight sit in Stockholm, three in Varberg and two in Vienna. The working language is English.
The team works closely together, but you are also expected to take your own problems from investigation to solution. People who do well here are curious, careful and take ownership.
Terms
Permanent, full-time
Stockholm or Varberg
Office-first, with hybrid flexibility agreed with your manager
Collective agreement with occupational pension and insurance
Equity options program
Wellness allowance
25 days of annual leave and flexible hours
On-site gym at the Stockholm office
Process
Introductory call with Armin at Lynqa
Remote interview with the Head of IXM Grid and Chief HR Officer
Technical discussion with the Lead Media Player Developer and the Product Owner about architecture, trade-offs and systems you have built. No take-home tests or live coding.
Visit the office and meet the team
ContactArmin Tankovic, Lynqa · [email protected]