Senior Software Engineer (Ruby)

Stack

Responsibilities

• ▹Design and evolve the core architecture of a high-load Data Quality 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 the PostgreSQL workload, which reaches approximately 4,000 RPS
• ▹Lead the backend migration of statistics and analytical workloads from PostgreSQL to ClickHouse
• ▹Build product features around DQ coverage, table lineage, incident lifecycle and operational investigation
• ▹Contribute to platform UI features when needed to deliver an end-to-end capability, using AI-assisted workflows
• ▹Own reliability of backend services: investigate incidents, diagnose bottlenecks, improve observability
• ▹Participate in a 24/7 on-call rotation
• ▹Help scale DQ adoption across the company by making integrations and operation of checks reliable
• ▹Work directly with data producers, infrastructure and business teams

Requirements

• ▹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 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, while critically validating the results
• ▹Product mindset and entrepreneurial ownership
• ▹Intermediate or higher English (B1+)

Nice to have

• ▹Familiarity with ClickHouse
• ▹Familiarity with Delta Lake, Trino, Spark or DuckDB

Soft skills

About the company

SOFTSWISS builds and runs a high-load internal Data Quality platform that executes millions of checks every day.