Senior Software Engineer - k6 Core | Spain | Remote

ABOUT THE ROLE We are seeking a highly skilled Senior Software Engineer to join our k6 Core team at Grafana Labs. As a leader in the open observability cloud, we are dedicated to building a reliable and scalable platform that enables developers and QA engineers to test and understand systems under real load. Our team is passionate about creating a culture of innovation, transparency, and trust, where engineers thrive in an environment that values clarity, pragmatism, and sound engineering judgment. WHAT YOU'LL DO As a Senior Software Engineer on our k6 Core team, you will be responsible for building and maintaining k6, a performance testing tool written in Go. You will work on features and improvements across the k6 codebase, from initial idea through implementation and delivery. This will involve working with a high degree of independence while collaborating closely with other engineers on design, implementation, and code reviews. You will be expected to deliver production-quality code, maintain existing functionality, and help keep the system reliable and maintainable over time. Some work may involve the k6 cloud offering, which builds on top of k6 to run distributed tests across data centers worldwide. WHAT YOU'LL NEED To be successful in this role, you will need to have strong experience building production software in Go, or another language with good support for concurrency and parallelism. You should also have experience working on larger or long-lived codebases, as well as the ability to work independently on scoped problems and deliver them to completion. Clear technical communication skills, especially in code reviews and design discussions, are essential. Additionally, you should have a good understanding of internet protocols such as HTTP, gRPC, and WebSockets, with some familiarity with lower-level networking concepts. Experience with modern development practices, including testing, code review, and iterative development, is also required. WHY REMOTE As a 100% remote company, we offer the flexibility and autonomy to work from anywhere in the world. Our team is spread across 40+ countries, and we are committed to creating a culture that values collaboration, transparency, and trust. We believe that remote work enables us to attract and retain top talent from around the world, and we are passionate about creating a work environment that is inclusive and supportive of all employees. BENEFITS At Grafana Labs, we invest heavily in our employees' growth and well-being. We offer a comprehensive benefits package, including a health plan, parental leave, education stipend, life insurance, and equipment stipend. We also provide a flexible schedule, allowing you to work from anywhere and at any time that suits you best. Additionally, we offer access to the latest AI coding assistants, including OpenAI, Anthropic, and Google models, to help you accelerate your development workflow.