Senior Ruby Engineer - Data Quality Platform (High-Load)

SOFTSWISS; Warszawa; On-site; PLN 200,000 - 300,000; Full time

Benefits offered by this job

Private health insurance

Sports benefits

Mental Health Program

Free English lessons

Local language courses

Paid time off

Maternity leave support

Referral program rewards

Upskilling and conferences

Job summary

SOFTSWISS is seeking a Senior Software Engineer (Ruby) to join the Data Quality Platform team in Warsaw. You will own backend architecture, PostgreSQL-heavy workloads, and migration to ClickHouse, delivering end-to-end product capabilities with AI-assisted workflows.

You will collaborate with data producers and infra teams, participate in a 24/7 on-call rotation, and shape product direction with ownership of production outcomes.

Qualifications

• 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.
• English and Russian language B1+ level (Intermediate+)

Responsibilities

• 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.

Skills

Ruby

Rails

PostgreSQL

SQL

Asynchronous systems

Backend design

Production ownership

AI-powered tools

Product mindset

English

Russian

Tools

ClickHouse

Delta Lake

Trino

Spark

DuckDB

Debezium

Kafka

Kubernetes

Helm

Prometheus

Grafana

Job description

SOFTSWISS is seeking a Senior Software Engineer (Ruby) to join the Data Quality Platform team in Warsaw. You will own backend architecture, PostgreSQL-heavy workloads, and migration to ClickHouse, delivering end-to-end product capabilities with AI-assisted workflows.

You will collaborate with data producers and infra teams, participate in a 24/7 on-call rotation, and shape product direction with ownership of production outcomes.