ABOUT BETBY As a fast-growing, award-winning company, Betby powers the industry with our premium sportsbook, featuring world-class risk management and seamless omni-channel support, reaching millions of players across countless markets. With offices in Latvia, Malta, Spain, Greece and Montenegro, we offer a vibrant work culture, relocation opportunities, and full support for remote talent across the globe.
Join Betby and unlock endless opportunities for growth, success, and making a real impact in the world of iGaming!
SHORT DESCRIPTION We are looking for a Python developer to join the Backoffice Reports team behind the Reports section of our back-office. You will own the backend of analytics reports used daily by operation teams (risk management, trading, account management and etc). The stack is async Python on top of ClickHouse. Reports are described as typed Pydantic models plus Jinja-templated ClickHouse SQL, executed through an RPC service over RabbitMQ and exposed to the UI through REST/GraphQL endpoints with OpenAPI-driven dynamic forms.
TECH STACK
Python 3.13+ (asyncio, Pydantic v2)
SQL
Jinja2 (SQL templating)
GraphQL
REST API
Kafka
RabbitMQ
MongoDB
Docker
Prometheus
Grafana
ELK
#NODJANGO
RESPONSIBILITIES
Develop and maintain reports in the Backoffice: filters, grouping, sorting, pagination, totals, drill-down links between reports, CSV exports and chart data
Write and optimize analytical ClickHouse SQL: aggregations over hundreds of millions of bets, multi-level grouping, period breakdowns (day / week / month / year)
Describe reports as typed contracts (Pydantic models for filters and output) in our shared reports library, which the analytics team also uses to tune queries
Work with the RPC layer between the backoffice API and the ClickHouse reporter service (RabbitMQ)
Implement access control for reports: scopes and roles, operator / brand data isolation, hiding fields depending on user role
Investigate slow reports: read query plans, choose the right filters, PREWHERE, pre-aggregation, and work with the analytics/DataFlow team on table design
Cover reports and SQL with tests, keep data correct across backoffice applications
Take part in code review and help evolve the reports framework (new report types, presets, custom segments)
REQUIREMENTS
3+ years of commercial development in Python
Confident asyncio: async/await, concurrency, async I/O clients
Pydantic v2 (models, validation, serialization) and type hints
Strong SQL - this is the key requirement:
Complex SELECTs with JOINs, subqueries and CTEs (WITH)
GROUP BY on several dimensions, conditional aggregation (SUM / COUNT with conditions)
Window functions
Understanding of how analytical queries scale and why a query is slow
Experience with a columnar / OLAP database (ClickHouse preferred; Vertica, Exasol, BigQuery, Redshift, Snowflake are a plus)
Experience building REST APIs in an async framework (Sanic, aiohttp, FastAPI, Starlette)
Understanding of message brokers (RabbitMQ and/or Kafka) and RPC over queues
Git, Docker, writing tests with pytest
Ability to understand a business metric (GGR, stake, payout, margin, etc.) and turn it into a correct query
NICE TO HAVE
Hands-on ClickHouse: MergeTree family engines, FINAL, PREWHERE, dictionaries (dictGet), -If combinators, ARRAY JOIN, WITH TOTALS, quantiles, uniq / uniqExact
Jinja2 or other SQL templating / query builders
Pandas for data post-processing and exports
MongoDB
GraphQL
Domain knowledge: sports betting, iGaming, fintech or ad-tech analytics
Prometheus / Grafana / ELK for monitoring and troubleshooting
Monorepo tooling (Pants, Poetry, uv), Nix
WHAT WE OFFER
Comprehensive health insurance with coverage for your well-being
Paid sick leave up to 10 days without medical certificate
20 days of paid vacation plus additional leave for important life events
Learning and growth opportunities with support for professional development
Language learning support for multilingual collaboration
Modern hardware provided for your work
International team environment across multiple countries
Corporate events and team activities
Welfare support program for critical situations
Gifts and support for major life milestones
WHY JOIN OUR DREAM TEAM? Betbyterians is a passionate team dedicated to creating exceptional B2B betting products. United by trust, support, and fun, we aim to revolutionize online gaming, tackling challenges with agility, creativity, and teamwork. Driven by innovation and strong business practices, our achievements speak for themselves. Experience it first-hand, join us and be part of something extraordinary. Welcome to Betby!
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Middle Python Developer with SQL Skills in Warsaw – pracodawca: BETBY
BETBY to szybko rozwijająca się, nagradzana firma, która oferuje dynamiczne środowisko pracy oraz możliwości relokacji i wsparcie dla zdalnych talentów na całym świecie. Pracownicy mają szansę na rozwój zawodowy w obszarze zarządzania ryzykiem w branży zakładów sportowych, a także na wpływanie na infrastrukturę sieciową i bezpieczeństwo. W firmie panuje kultura małych, autonomicznych zespołów, co sprzyja wzrostowi i poczuciu odpowiedzialności.
