WunderGraph is a fast-growing startup, our goal is to bring everybody together to build digital products end-to-end. From interface design to API implementation, we provide the platform to go from sketch to product in a category-defining collaborative experience. Our North Star is to take the friction out of bringing digital ideas to life, making room for your ideas and productivity. Developers from some of the biggest companies in the world are using WunderGraph to design and streamline their API environments. We raised our Series A ($7.5 million USD) in March 2025, being backed by eBay, Karma Ventures, and Aspenwood Ventures. The culture we are creating together is extremely important to us. Read here how we are Building the Company We Always Wanted to Work In . We invite everyone that wants to join us to understand our Core Beliefs and if you want to make an impact, have your voice heard, and work in a no-BS organization where you can get stuff done, look no further and apply today so we can chat. About the Role We're building WunderGraph Cosmo, the open-source GraphQL Federation solution. Probably the most important component of Cosmo is the Cosmo Router, which - simply put - connects all API endpoints and handles the GraphQL requests and responses whilst applying the Federation protocol (among other magical things, like normalization, execution planning etc.). Fully written in Go, it's the fastest GraphQL Router available and a quite potent (and complex) piece of cutting-edge open-source software. How about joining our team to make it even better and strap the rocket boosters onto GraphQL Federation? TEAM INTEGRATION You align with the Product team and Customer Success teams for product feedback You support and consult with the engineering team. You will be in charge of Develop, refactor and maintain GraphQL Go Tools' (Router) open-source code base in Golang (low GC code) Work closely with your engineering team mates on new Router capabilities (e.g. Open Federation, new data sources) Focus on performance, security and stability of the Router Review Router telemetry to identify areas of improvement Run internal penetration tests of the Router Troubleshoot Router issues, potentially together with our customers' engineers Analyze and accept up open-source contributions on Github The "Engine" is essentially a Golang application which translates GraphQL requests into any other protocol, like OpenAPI, SOAP, gRPC, GraphQL, Apollo Federation, etc. You could consider the Engine as a "GraphQL Compiler" or Transpiler. The Engine is responsible for parsing, normalization, execution planning, execution runtime, etc... If you are interested in working with ASTs, AST transformations, etc... you will love this kind of work. We have performance requirements, so you should be proficient in writing performant and low GC code in Golang. Some of your tasks will take more than a few weeks to complete, Ideally, you're someone who likes to go deep on one topic instead of going wide and shallow on many different topics. Here's a list of things you might be working on: Extend the Compiler "backend" to support Apollo Federation v2 Extend the Compiler "backend" to support gRPC Implement a native Go-based data source for SOAP and OpenAPI, currently we're using a Node.js based solution with a bridge Improve the batching-implementation of the Engine Improve the performance of the Engine in general, driven by feedback from our customers What you bring to the team Senior/Staff level of proven Golang development experience in a leading / ownership role (must have) Self-starter with a clear sense of priorities - no hand-holding needed You must be willing and able to work out solutions on your own. This requires you to dig into hard problems and stay on target until you have solved an issue in a robust way. Experience in working with ASTs, AST transformations etc. Experience in writing performant and low GC code in Golang, and knowledge of how to benchmark

Senior/Staff Golang Engineer (EMEA)

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