Senior Full Stack Engineer, Experimentation

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This is a remote opportunity and we would be interested in applications from the UK, Ireland, Sweden, Spain and Germany.Full-TimeSenior

SalaryIn Germany, the base compensation range for this role is €100,000 - €125,000. All of our roles include Restricted Stock Units (RSUs)

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Job Details

Have strong full-stack engineering experience building and operating production web applications with TypeScript and React.
Have backend service experience in Go, or a similar language with willingness to work in Go.
Value maintainability, automated testing and secure development practices.
Have experience building an in-house experimentation platform or integrating an existing experimentation or A/B testing platform.
Be comfortable working with event data, SQL and data warehouses such as BigQuery.
Have delivered complex projects with minimal supervision, using short feedback loops to analyze, design, ship, learn and iterate.
Have experience being on call and supporting software in production, and know how to make systems observable and debuggable.
Use AI coding tools thoughtfully, validate their output and share practices that improve team speed and quality.
Be able to explain technical and statistical tradeoffs to engineers, analysts and product managers in a remote, asynchronous environment.
Bonus: Have hands-on experience with feature flags and OpenFeature.
Bonus: Understand experiment statistics, including Bayesian or frequentist testing, sample sizing, variance reduction, peeking and sample ratio mismatch.
Bonus: Have experience with Kubernetes concepts such as custom resources, operators, admission webhooks and GitOps.

Own end-to-end features for the experimentation app across its React frontend and Go backend, from design through rollout and iteration.
Develop workflows for defining hypotheses, configuring experiments and metrics, managing experiment lifecycles, and exploring results.
Evolve the experimentation SDK and its OpenFeature and Faro integrations to support consistent identity and event contracts.
Integrate experiment exposure and outcome capture with Grafana Faro and Frontend Observability, and link results to Session Replay and user journeys.
Work with data analysts to extend the statistics engine and improve the scalability, cost-awareness and correctness of analysis.
Extend Grafana Assistant integration for experiment authoring, explanation and reporting.
Mentor teammates through code review, pairing and design documents, and write architecture decision records, documentation and demos.
Take part in on-call for the services you build and support internal teams running experiments.

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