Software Engineer (Ruby) – Senior

About the role

At SOFTSWISS, the Senior Software Engineer will join the Data Quality Platform team, responsible for developing a high-load system that performs millions of data checks daily. The role emphasizes backend engineering and production reliability, ensuring that the platform meets performance and operational standards.

Successful candidates will design and evolve the platform's core architecture, improve system throughput, and lead migrations of data workloads. Collaboration with various teams, including data producers and infrastructure, is essential to address technical challenges and enhance the platform's capabilities.

Skills that matter here

• Ruby: This role requires strong Ruby skills for backend development of the Data Quality Platform.
• PostgreSQL: Candidates must have deep expertise in PostgreSQL to optimize production workloads and manage data efficiently.
• SQL: Strong SQL skills are necessary for investigating complex data discrepancies across large datasets.
• asynchronous systems: Experience with asynchronous systems is crucial for managing background jobs and ensuring system reliability.
• Kubernetes: Familiarity with Kubernetes is important for managing containerized applications within the platform.
• Kafka: Knowledge of Kafka will assist in handling data streams and ensuring efficient data processing.

Who this role suits

• A candidate with a strong background in backend development and production systems.
• Someone who thrives in a collaborative environment, working closely with cross-functional teams.
• A proactive problem-solver who can identify and address technical challenges effectively.
• An individual who is comfortable with on-call responsibilities and has a product-oriented mindset.

From the employer

• Design and evolve core architecture of a high-load DQ platform running millions of checks per day
• Improve throughput, latency and reliability of orchestration, scheduling, dependency resolution, retries and mutation-driven reruns
• Profile and optimise PostgreSQL-heavy production workloads; the platform's PostgreSQL workload reaches approximately 4,000 RPS
• Lead backend migration of statistics and analytical workloads from PostgreSQL to ClickHouse
• Build and evolve product features around DQ coverage, table lineage, incident lifecycle and operational investigation
• Contribute to platform UI features when they are necessary to deliver an end-to-end product capability, using AI-assisted development workflows
• Own reliability and production behaviour of backend services: investigate incidents, diagnose performance bottlenecks, improve observability and prevent recurrence
• Participate in a 24/7 on-call rotation
• Help scale DQ adoption across the company by making integrations, configuration and operation of checks reliable and approachable
• Work directly with data producers, infrastructure and business teams
• Proactively identify product, technical and operational problems; turn them into well-scoped, production-ready improvements

• Strong Ruby and Rails skills
• Strong experience developing and operating high-load production systems
• Deep PostgreSQL expertise: query planning and profiling, indexes, locking, transactions, concurrency, connection behaviour and performance tuning under sustained load
• Strong SQL skills and ability to investigate complex data discrepancies across large, multi-source datasets
• Experience with asynchronous systems: background jobs, queues, retries, idempotency and failure recovery
• Experience designing complex backend systems from scratch and evolving them safely in production
• Hands-on production ownership: metrics, logs, tracing, incident investigation and performance analysis
• Strong practical use of AI-powered developer tools: navigating unfamiliar codebases, prototyping, debugging, reviewing and delivering changes faster, while critically validating the result
• Product mindset and entrepreneurial ownership: ability to see an opportunity, formulate a solution, validate it with users or data, and drive it through delivery
• Intermediate or higher English (B1+)

• Private health insurance
• Sports benefits
• Comprehensive Mental Health Program
• Free English lessons (online)
• Local language courses
• Paid time off
• Maternity leave support
• Referral program rewards
• Upskilling, internal workshops, and participation in professional conferences and corporate events