Senior BI Developer

Group107 is looking for a Senior BI Developer to join our team on a long-term project for our client, yellowHEAD. You will become part of yellowHEAD’s technology team and co-own the full Agile lifecycle — development, implementation, maintenance, support, and performance tuning.

• Design, develop, and optimize end-to-end BI pipelines (ETL/ELT) using Rivery, BigQuery, and SQL.
• Build and maintain data models in BigQuery and BI environments to support reporting, analytics, and product use cases.
• Develop backend services, APIs, and automation in Python to support data products and integrations.
• Maintain ongoing integrations with multiple external data sources (Facebook, Google, Appsflyer, Adjust) on cloud infrastructure (AWS, GCP, MySQL).
• Build and iterate on customer-facing dashboards and internal reports in Looker Studio (and other dashboard frameworks as needed).
• Own performance tuning, code quality, and architectural decisions across BI and non-BI technological projects.
• Mentor middle-level developers, drive engineering best practices, and represent the team to internal and external stakeholders.

• Advanced SQL — query optimization, complex joins, window functions, performance tuning.
• Strong ETL/ELT engineering experience; preferred hands-on with Rivery.
• Deep experience with Google BigQuery — data modeling, partitioning, optimization.
• Strong Python (or equivalent) — capable of building APIs and backend services for data products.
• Experience integrating with third-party APIs (e.g., Facebook, Google, Appsflyer, Adjust).
• Hands-on experience with cloud infrastructure: AWS and/or GCP, plus MySQL.
• Hands-on experience with Looker Studio or other dashboard frameworks.
• Practical experience with AI-assisted coding tools (GitHub Copilot, CodeX, or similar).
• Upper-Intermediate (B2)+ English — strong written, verbal, and presentation skills for direct work with internal teams and external clients.
• Proactive, fearless mindset — comfortable iterating on pipelines and challenging the status quo.
• Strong ownership — capable of pushing the team forward and raising its technical bar.
• Service-oriented approach when working with marketing teams, analysts, and account managers.
• Strong stakeholder management — representative and confident in both internal and external communication.
• Mentorship and collaboration — supports middle developers and contributes to code reviews and design discussions.
• Calm, collaborative temperament; team player.

• 20 paid vacation days (workdays) per year
• 7 paid sick days per year
• Personalized career growth plan with regular performance reviews
• Education reimbursement — courses, certifications, and conferences
• Corporate events and team-building activities
• Full equipment provided for remote work