Softswiss

Software Engineer (Ruby) – Senior

Warszawa, Poland · Work style not stated · Full-time

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EmployerSoftswiss
LocationWarszawa, Poland
Work styleWork style not stated
Employment typeFull-time
Employer posted19 days ago

Overview:

SOFTSWISS is hiring a Senior Software Engineer (Ruby) to join our Data Quality Platform team. We build and own a high-load Data Quality platform used across the company. Our product runs millions of checks every day, helps teams detect and investigate data issues, and provides tools to improve trust in their data.

We are looking for a senior engineer who can independently identify opportunities, shape product direction, build reliable solutions, and take ownership of their production outcomes.

Purpose of the role:

Your primary focus will be core backend platform engineering: architecture, orchestration, data models, PostgreSQL performance and reliability of the DQ runtime.

You will own the production behaviour of the services you build and may contribute to UI features when they are needed to deliver an end-to-end product capability. Frontend and SRE specialisation are not prerequisites: we use AI-assisted workflows and expect strong engineering judgement, ownership and willingness to work across the stack when needed.

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Key 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

Required Experience:

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+)

Nice to have:

Familiarity with ClickHouse

Familiarity with Delta Lake, Trino, Spark or DuckDB

Experience with Debezium (or any other CDC implementation), Kafka, data ingestion & transformation patterns

Experience with Kubernetes, Helm, Prometheus/Grafana and production service operations

Experience building side projects, launching product capabilities, or independently improving a product beyond assigned tasks

Our Benefits:

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

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