Backend Developer | Senior
HybridBarcelona, Catalonia, Spain
EXPIREDBarcelona, Catalonia, SpainHybridPart TimeSenior LevelSmall
Part TimeSenior LevelSmall
Job Summary
Design, build, and maintain backend services for real-time and analytical data processing, owning features end-to-end from approach to production. Optimize pipelines for low latency and high throughput while keeping services healthy through observability, feedback loops, and incident response. Contribute to design reviews to evaluate trade-offs and raise standards via code review, pairing, and knowledge sharing. Work with engineers, product, and stakeholders to align on direction in an empowered environment where you are handed context rather than tickets.
Required Qualifications
- 4+ years as a software engineer, with production systems you've built and supported
- High ownership tendencies
- Experience in a product-focused organisation, working cross-functionally
- Comfortable across multiple languages — we mainly use Kotlin, Java, Python and TypeScript
- Able to reason about trade-offs (throughput, latency, consistency, cost) and explain them
- At home in system design and in low-level implementation detail
- Experience building and deploying services on AWS or GCP
- Hands-on exposure to Kafka, Flink, Redis or clustered Postgres, and an appetite for more
- Comfortable with agent-based development tools (we use Claude Code; any equivalent is fine)
- A clear communicator and a pragmatic problem-solver
- Experience with data-intensive applications at scale
- Building and interpreting observability — metrics, logging, tracing
- Exposure to working within or alongside DevOps, SRE or infrastructure teams
- Complex distributed environments — high throughput, low latency, large datasets
Desired Qualifications
- Any exposure to commodities, energy or financial markets (useful, but not required — we'll teach you the domain)
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