Junior Backend Engineer: Build Scalable SaaS Data Platforms

Sensor Tower; Warszawa; On-site; PLN 120,000 - 180,000; Full time

Job summary

Sensor Tower, a leading digital intelligence platform, is seeking curious early-career engineers to help build fast, reliable systems that power market insights for SMBs.

You’ll work with experienced engineers on features from day one, participate in the full development life cycle, and learn how large-scale systems are designed and deployed.

If you enjoy solving problems and shipping real software used by thousands of customers, we’d love to meet you.

Qualifications

• 2+ years of experience with Go; strong coding fundamentals and a portfolio of meaningful projects.
• Strong SQL skills (Postgres/ClickHouse); know when to use ORM vs raw SQL.
• Commitment to writing testable, maintainable code for long-term reliability.
• Ability to see the product from the user’s perspective and deliver value.
• Curiosity and drive to dig into sources and understand why a project matters.
• Experience with CI/CD, Docker, and Kubernetes is a plus.
• Able to pass technical interviews in Russian and English.
• Hands-on and thoughtful use of AI tools in development.

Responsibilities

• Improve and build new features for a market intelligence SaaS platform.
• Participate in the full development life cycle from design to release.
• Work on parsing, data aggregation, API design, refactoring, and performance tuning.
• Create and optimize complex database queries for analysis and modification.
• Perform code reviews and suggest process improvements.

Skills

Go

SQL

Testing

CI/CD

English

Russian

AI tools

Tools

PostgreSQL

ClickHouse

MongoDB

Elasticsearch

RabbitMQ

GitLab

Docker

Kubernetes

Job description

Sensor Tower, a leading digital intelligence platform, is seeking curious early-career engineers to help build fast, reliable systems that power market insights for SMBs.

You’ll work with experienced engineers on features from day one, participate in the full development life cycle, and learn how large-scale systems are designed and deployed.

If you enjoy solving problems and shipping real software used by thousands of customers, we’d love to meet you.