Backend Engineer with analytical skills

Appunite; Poznań; Hybrid; PLN 179,000 - 246,000; Full time

Benefits offered by this job

Remote work

Office access in Poznań/Warsaw

Job summary

Appunite is part of the biggest e-commerce platform in Poland and one of Europe’s most recognizable, with almost 200 mln MAU and over 20 years of presence.

You will design, build, and maintain Kotlin/Java microservices across the full development lifecycle, pull data for KPIs, and turn numbers into clear business insights for stakeholders.

The role supports remote work with office access in Poznań, Warsaw, Kraków and Toruń, with quarterly on-site visits to Poznań or Warsaw.

Qualifications

• Solid commercial experience coding in Kotlin or Java.
• Build scalable microservices and RESTful APIs with Spring Boot.
• Write advanced SQL and work with BigQuery (GCP knowledge a plus).
• Create dashboards and present results with clear metrics.
• Communicate effectively in Polish and English (B2+).

Responsibilities

• Design, build, and maintain Kotlin/Java microservices across the full lifecycle, from development through production support.
• Pull the data behind project KPIs such as GMV, transactions, and returns.
• Build dashboards at the end of a project that show its real impact.
• Turn numbers into a business story for stakeholders across teams.
• Collaborate with analysts and other product teams as the roadmap grows.

Skills

Kotlin

Java

Spring Boot

SQL

BigQuery

GCP

Dashboards

REST APIs

Tools

Kotlin

Java

Spring Boot

BigQuery

GCP

Job description

The cooperation which stayed from startup to full-blown profitable product team!

Be a part of the biggest e‑commerce platform in Poland and one of most recognizable in Europe with almost 200 mln MAU, which exists for over 20 years.

Our mission is to deliver the best possible customer experience across all platforms: web and mobile. From the moment customers visit our site to browsing, searching, comparing listings, purchasing, and post-purchase services, we ensure seamless, fast, and reliable operations.

What we offer

• Salary: 16 000 - 22 000 PLN net on B2B - depending on your experience

• Growth in DDD and event-driven architecture, built into how our services work, plus Kotlin, BigQuery, microservices and AI tools in daily work

• Remote work with office access in Poznań, Warsaw, Kraków and Toruń. We ask for an on-site visit to Poznań or Warsaw 1–2 times per quarter.

• Have solid commercial experience coding in Kotlin or Java (and want to master Kotlin for new services)

• Build scalable microservices and RESTful APIs with Spring Boot

• Write advanced SQL on their own. This is the core analytical skill. Experience with BigQuery is a strong plus; the rest of GCP we can teach

• Have built dashboards and can present results so the right number is obvious at a glance

• Think like engineers, not only programmers: comfortable across backend, some frontend, and networking basics

• Take ownership: we’ll show you how the platform works, then expect you to find answers and propose solutions yourself

• Use AI tools (e.g., Copilot) daily for coding, debugging, and research

• Communicate effectively in Polish and English (at least B2)

What you’ll do

• Design, build, and maintain Kotlin/Java microservices across the full lifecycle, from development through production support

• Pull the data behind project KPIs such as GMV, transactions, and returns

• Build dashboards at the end of a project that show its real impact (for example, after launching listing grading: did time-on-page drop, and how did conversion change?)

• Turn numbers into a story the business and other teams can follow

• Work with analysts, business stakeholders, and, as the roadmap grows, other product teams across the platform

• Give honest feedback: your mixed skill set should help the team see what could be done better

What does the recruitment process look like?

1. Video interview with our People Team.

2. Technical interview with an engineer from the project (about 1h, no live coding), including the analytical part.

3. Short final check with Team Leader (20–30 min).

4. The decision, after which we can say “welcome on board”.