Staff Software Engineer en Barcelona, España

• Deep experience building production-grade systems software, with technical ownership at Staff level.

• Strong in Go and comfortable in C (or C++), close to the operating system.

• Solid Linux internals - filesystems, namespaces, processes, signals, networking - and comfortable debugging at that level.

• Built distributed and/or cloud-native systems and understand the failure modes of running across multiple clouds.

• Write simple, well-structured, well-tested code; optimize for clarity and debuggability.

• Comfortable with ambiguity and driving work independently.

• We use AI every day and expect engineers to use it extensively - you don't need to be an expert, but you must be genuinely open to it.

• CRIU / checkpoint-restore / process migration.

• FUSE or other filesystem/VFS work.

• Rust; JVM (Groovy/Java, Micronaut).

• Container runtimes, Docker internals, Kubernetes.

• HPC/Batch (AWS Batch, Google Batch, Azure Batch).

• Applied ML / data engineering (Groundswell); open-source systems contributions.

• Flexible working hours.

• International working environment with more than 25 nationalities.

• Passionate & talented team.

• Continuous skills development.

• Team retreats and bonding activities.

• A culture where your opinion is valued and your decisions have a real impact on the industry.

• Excitement of a fast-growing startup in a constantly changing environment.

• Time off: 23 days for vacations per year, 3 days given by Seqera in December, and the national/public holidays according to your location.

• Equity

• Private health insurance

• Private life insurance

• Home office allowance (valued over 1,000 USD)

• Subscription to Oliva, Mental Health App

• Learning and development budget per year (1,000 USD)

We are looking for a Staff Software Engineer to join our Unified Compute team and take technical ownership of the low-level systems that power how scientific workloads run in the cloud. Our scheduling project (Sched) has gained real momentum, and we need a senior engineer to help build the ecosystem around it to the next level. The core of this role is deep in the stack - Fusion (a FUSE filesystem presenting cloud object storage as POSIX), Fusion Snapshots (CRIU-based checkpoint/restore that survives spot-instance reclamation), and Ignite (a container process manager) - with Sched as the orchestration layer that ties compute together. You'll also support adjacent services such as Groundswell (ML-based resource prediction) and Cloudinfo (multi-cloud pricing/metadata). It's a hands-on senior role with strong architectural influence.

• Design, build, and own low-level systems across Fusion, Fusion Snapshots, Ignite, and Sched.

• Write reliable, well-tested code primarily in Go and C, with Rust and JVM (Groovy/Java, Micronaut) where the codebase calls for it.

• Work close to the OS: FUSE filesystems, Linux namespaces, CRIU checkpoint/restore, process supervision, signal handling, static musl builds.

• Tackle multi-cloud orchestration and scheduling: provider abstractions (AWS, Azure, GCP), instance selection, autoscaling, spot-instance fault tolerance, durable async queues.

• Drive performance engineering - chunked I/O, multi-level caching, buffer pools, bandwidth management.

• Set technical direction and raise the standard for testing, observability, and operational excellence.

• Mentor teammates and help onboard new engineers.