Backend Engineer (Jr/Mid Level) - Golang

JobCubby; Kraków; On-site; PLN 180,000 - 240,000; Full time

Job summary

Sensor Tower is hiring for an early‑career backend engineer to join a fast-paced data platform team. You’ll contribute from day one, building features for AppMagic and learning how large-scale systems are designed and operated.

You’ll work with Go, PostgreSQL, ClickHouse, and other tech, collaborating across design, implementation, and release, while growing in a supportive culture that values ownership and continuous learning.

Qualifications

• +2 years of experience with Go and building backend services.
• Strong SQL skills (Postgres/ClickHouse) and ability to write complex queries.
• Commitment to testable, maintainable code and long-term reliability.
• Ability to see the product through the user’s eyes and deliver value.
• Curiosity, proactivity, and ability to learn quickly in a fast-paced environment.
• Experience with CI/CD, Docker, and Kubernetes is a plus.
• Ability to pass technical interviews in Russian and English.
• Hands-on, thoughtful use of AI tools in development.

Responsibilities

• Improve and build features for a market intelligence SaaS platform (AppMagic by Sensor Tower).
• Participate in design, implementation, QA, and release cycles.
• Work on parsing, data aggregation, API design, refactoring, and performance optimization.
• Create and optimize complex database queries for data analysis.
• Perform code reviews and suggest tooling/process improvements.

Skills

Go

SQL

CI/CD

Docker

Kubernetes

Russian

English

Tools

PostgreSQL

ClickHouse

Elasticsearch

MongoDB

RabbitMQ

GitLab

Job description

About this role:

Sensor Tower’s digital intelligence platform provides unparalleled insight into market trends, advertising, competitor’s strategies, and consumer/user audience across mobile, web, and gaming. Sensor Tower’s insights are trusted by more than 2,500 enterprises worldwide across tech, retail/commerce, entertainment/media, gaming, consumer packaged goods, finance, and investment.

At Sensor Tower, we process tens of terabytes of data to power insights used by thousands of customers. We’re looking for curious, motivated early-career engineers who want to grow their skills while helping us build fast, reliable systems that make data easy to access and understand.

You’ll work closely with experienced engineers, contribute to meaningful features from day one, and learn how large-scale systems are designed, built, and optimized in production.

If you enjoy learning, solving problems, and shipping real software that users rely on, we would love to meet you.

Our Engineering Culture

• Simplicity: We avoid over-engineering. We prefer the tools we already have and the most straightforward solutions over "shiny new toys."
• Quality: We write code that is a pleasure to read because we know code is written once but read many times. We don't cut corners, and we polish to a high level before shipping.
• Extreme Ownership: We don't just do the minimum. We expect you to understand the "why" behind your work and own the ultimate goal of fixing problems at their root cause, avoiding temporary band-aids.
• Prioritization: We focus relentlessly on what is important, not just what is urgent.

What you’ll do:

• Improving and building new features for an app market intelligence SaaS platform focused on the SMBs (AppMagic by Sensor Tower).
• Participate in the full development life cycle, including design, implementation, quality polish, and release.
• Work on a variety of tasks, such as parsing, data aggregation, API design, refactoring, and performance optimization.
• Create and optimize complex database queries for data analysis and modification.
• Perform code reviews, and suggest improvements to tools and processes.

We don’t expect you to handle everything from day one. You’ll be supported by teammates, starting with maintenance tasks to get to know the product better, and gradually taking on more ownership as you grow.

Backend stack

Golang, PostgreSQL, ClickHouse, MongoDB, Elasticsearch, RabbitMQ, GitLab, Docker, Kubernetes.

What we are looking for:

• +2 years of experience with Go (if you have lesser years of experience but have meaningful github contributions and other coding samples, this will be taken into consideration).
• Strong SQL skills (Postgres/ClickHouse). You know when to rely on an ORM and when to write raw SQL, and you're comfortable writing and debugging complex queries.
• Focusing on quality by writing testable code that simplifies debugging and ensures long-term reliability.
• Ability to see the product through the user’s eyes and a passion for product excellence.
• Curiosity & drive: a proactive approach to digging into sources yourself rather than relying on second-hand information, and an eagerness to understand why a project is valuable before you start coding.
• Experience with CI/CD, docker, k8s as a plus.
• Ability to pass technical interview both in Russian & English.
• Hands-on, thoughtful use of AI tools in development.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.