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Junior Backend Engineer
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Offer summary

(Summary generated by AI based on the full job description)

The project focuses on designing and evolving the backend of an event processing and analytics platform powering AI-driven customer experience. The tech stack primarily includes Scala, Apache Kafka, ElasticSearch, ClickHouse, Kubernetes and cloud environments Azure and GCP, with observability via OpenTelemetry and Jaeger. Responsibilities cover architecture and design for high-volume data processing, performance optimization, translating requirements into detailed designs and analyzing large data stores to uncover insights.

you can start ASAP

Junior Backend Engineer

Company: Synerise S.A.

from: 23 October 2026
to: 22 November 2026
7000 - 9000 złnet (+ VAT)/ mth.B2B contract (full-time)
salary not specifiedcontract of mandate
Offer parameters
level:junior
working mode:hybrid
Kraków, Krowodrza
Kraków, KrowodrzaWładysława Reymonta 20View on map

Requirements

Expected technologies

Java
Scala
Kotlin
Rust
SQL
NoSQL
Claude Code
Cursor
GitHub Copilot

Optional technologies

GitHub
GitLab

Our requirements

  • Programming skills in any JVM language (like Java, Scala, Kotlin) or Rust, and a strong willingness to learn them quickly.
  • Basic experience with at least one web framework and an understanding of how web applications work.
  • Familiarity with SQL or NoSQL databases and basic database queries.
  • Hands-on experience using AI coding (e.g., Claude Code, Cursor, GitHub Copilot) as part of daily software engineering work.
  • Decent troubleshooting and analytical skills with a methodical approach to solving technical problems.
  • A passion for building tools and learning new technologies.
  • Strong analytical and communication skills.

Optional

  • Existing GitHub/Gitlab portfolio or personal projects.
  • Experience with microservices architecture.
  • Basic knowledge of AI/ML concepts.

Your responsibilities

  • Develop architecture and design patterns to process and store high volume data sets.
  • Develop software with a core focus around optimisation and performance.
  • Translate complex functional and technical requirements into detailed design.
  • Perform analysis of vast data stores and uncover insights.

About the project

Synerise is looking for a Junior Backend Engineer - to design, build, and evolve backend for event processing and analytics platform that powers AI-driven customer experience.
Having such great solutions, we are looking for a highly motivated Junior Backend Engineer to join our brave and brilliant Synerise Team. See if you fit our diverse and dynamic environment, where we constantly evolve together with the growth of our clients.
Our Backend Team works primarily with Scala, Apache Kafka, ElasticSearch, Clickhouse, Kubernetes, and cloud environments (Azure and GCP). Observability is a first-class concern: distributed tracing (OpenTelemetry, Jaeger), structured logging, and rich metrics are embedded into how we design and operate services.

This is how we organize our work

This is how we work

you have influence on the technological solutions appliedyou develop the code "from scratch"you focus on product developmentagile

Team members

backend developertechnical leaderarchitectdevOpsdata scientist

This is how we work on a project

  • code review
  • active monitoring
  • documentation
Having such great solutions, we are looking for a highly motivated Backend Software Engineer to join our brave and brilliant Synerise Team. See if you fit our diverse and dynamic environment, where we constantly evolve together with the growth of our clients.
Company

What we offer

  • Work on a production-grade, large-scale system used by enterprise customers worldwide.
  • Real technical challenges around performance, data volume, and distributed systems.
  • Opportunities for continuous technical growth and deeper ownership over system design.
  • Support from experienced engineers and a strong engineering culture.
  • Influence on architectural and technical decisions within your team.

Benefits

  • sharing the costs of sports activities
  • private medical care
  • remote work opportunities
  • flexible working time

Synerise S.A.

Synerise is not just another tech company. It is a space where our brilliant team consequently brings technology change to the business world and instead of following known paths, we are creating a new one – a next-generation, fully personalized, and AI-driven customer experience.
We successfully deliver an all-in-one tool – Synerise. An ever-evolving behavioral data platform, enhanced by AI to generate outstanding ROI in more than 30 markets for industry leaders in Retail, Banking, eCommerce, Automotive, Insurance, and Telco, processing more than 150 billion transactions annually. However, we don’t limit ourselves solely to this solution. We’re building BaseModel – a foundation model for behavioral data embedded within a novel platform for enterprise Data Science teams, that is another step on our path to create innovation in AI and demonstrate its potential for the business world.
Junior Backend Engineer
7k–9k zł / mth. (B2B)
I apply to:
Synerise S.A.
Kraków, Krowodrza
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