Data Engineer

Department: Data

Location: Ukraine, Bulgaria, Cyprus, Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Romania, Slovakia, Slovenia, Moldova, Montenegro, Serbia

Employment Type: FullTime

About us

Ruby Labs is a leading tech company that creates and operates innovative consumer products. We offer a diverse range of opportunities across the health, education, and entertainment industries. Our innovative teams are driving the future of consumer-led products, and we're always looking for passionate individuals to join us. Learn more about our story at: https://rubylabs.com/about-us/

About the role

We're looking for a Data Engineer with deep experience in event-driven, real-time financial analytics and strong technical skills in ClickHouse. You will own the data platform that powers Paynext payments and billing analytics: design event pipelines, build and optimize datasets, and deliver reliable, low-latency data products that product, finance, risk, and operations teams rely on daily.

Key Responsibilities

• Design and build event-driven, real-time data pipelines on ClickHouse, Google Cloud, and Airflow to power dashboards and self-serve analytics.

• Optimize ClickHouse schemas, materialized views, and queries for performance, correctness, and cost.

• Model core financial datasets for payments and subscriptions: authorizations, declines, refunds, chargebacks, disputes, dunning, MRR/ARR, LTV, churn, cohort retention.

• Own data quality and observability: tests, monitoring, alerting, lineage, and SLAs for freshness and correctness on Tier-1 datasets.

• Investigate anomalies and data-quality issues in financial data, perform root-cause analysis, and drive fixes end-to-end (instrumentation → pipeline → metric).

• Partner with Backend/Platform on event schemas and instrumentation to ensure high-quality, well-typed billing and payments events.

• Document logic (metric definitions, tables, pipeline behavior) and build internal tooling/templates that let analysts ship safely on top of the platform.

Qualifications

• Production experience with ClickHouse is mandatory: data modeling (MergeTree family, projections, materialized views), query tuning, partitioning/sharding, and operational awareness.

• Strong experience designing event-driven, real-time analytics pipelines (Kafka / Pub/Sub / Kinesis or equivalent), including schema design, backfills, and replay.

• Hands-on with Google Cloud data stack (Pub/Sub, GCS, BigQuery, Cloud Run / GKE, IAM) for ingestion, storage, and orchestration.

• Production experience with Apache Airflow (DAG design, sensors, retries, SLAs, idempotent tasks, incremental loads).

• Advanced SQL (complex joins, window functions, incremental logic, performance-aware query writing).

• Strong Python for data engineering (pipelines, transformations, tests, tooling).

• Git workflow (PRs, code review, CI for SQL/pipelines, versioning of data logic).

• Experience working with financial / payments / subscription data (or comparably high-stakes domains) where correctness is non-negotiable.

• Ability to communicate trade-offs and findings clearly to both technical and non-technical stakeholders.

Nice to have

• Tinybird experience (pipes, endpoints, materializations, performance tuning).

• dbt, Dataflow / Beam, Spark, or other large-scale processing frameworks.

• Experience with risk/fraud or billing & payments analytics (auth rate, dispute rate, dunning recovery, BIN/issuer analysis).

• Experience with experimentation/A/B test data infrastructure.

• Terraform / IaC, Docker, Kubernetes for data infra.

Location

Ruby Labs operates within the CET (Central European Time) zone. Applicants from any country are welcome to apply for the position as long as they are located within approximately ± 4 hours of CET. This ensures optimal collaboration and communication during working hours.

Benefits

Discover the perks of being part of our vibrant team! We offer:

• Remote Work Environment: Embrace the freedom to work from anywhere, anytime, promoting a healthy work-life balance.

• Unlimited PTO: Enjoy unlimited paid time off to recharge and prioritize your well-being, without counting days.

• Paid National Holidays: Celebrate and relax on national holidays with paid time off to unwind and recharge.

• Company-provided MacBook: Experience seamless productivity with top-notch Apple MacBooks provided to all employees who need them.

• Flexible Independent Contractor Agreement: Unlock the benefits of flexibility, autonomy, and entrepreneurial opportunities. Benefit from tax advantages, networking opportunities, reduced employment obligations, and the freedom to work from anywhere. Read more about it here: https://docs.google.com/document/d/1nkrN76JlZkbKj9WSOhlT1_mni_CZeDkHdwfIjPXVwvk/preview?tab=t.0#heading=h.ndsdl4wapxtt

Be part of our fast-growing team and seize this excellent opportunity for personal and professional growth!

Interview Process

After submitting your application, we conduct a thorough review which typically takes 3 to 5 days, but may occasionally take longer due to the volume of applications received. If we see a potential fit, we proceed with the following steps:

• Recruiter Screening (40 minutes)

• Technical Interview (60 minutes)

Life at Ruby Labs

At Ruby Labs, we move fast, aim high, and expect the same from our team. We’re not here to play small—we’re here to build, grow, and win. That means we look for people who are ambitious, driven, and ready to give their best every single day.

This is a place for individuals who thrive under pressure, embrace challenges, and see opportunity in every obstacle. If you’re hungry to achieve, motivated by impact, and want to grow at the speed of your own ambition, Ruby Labs offers the platform to make it happen.

Here, effort is matched with reward. We recognize those who go all in and deliver results, and we create space for people who want more—more responsibility, more growth, and more success.

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