Junior Scala Engineer

About the Position

Synerise is looking for a Junior Scala Engineer to design, build, and evolve the backend for our event processing and analytics platform that powers AI-driven customer experience.

Synerise is a company where our brilliant team brings technology change to the business world. We are creating a new path – a next-generation, fully personalized, and AI-driven customer experience.

We 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. We are also building BaseModel – a foundation model for behavioral data embedded within a novel platform for enterprise Data Science teams.

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 with Scala, Kafka, ElasticSearch, ScyllaDB, Azure, GCP, and Kubernetes. Distributed tracing (OpenTelemetry, Jaeger), structured logging, and rich metrics are core to how we build and operate services. Both Backend and Frontend teams are supported by dedicated QA and Infrastructure teams. We like to experiment, and we have the environment to do it. We use AI coding assistants (Claude, Copilot) as a daily part of our workflow.

The platform handles up to 28k API requests per second at peak with p95 latency under 100ms. You'd be joining the team responsible for event processing and analytics - the part of the platform that ingests, processes, and stores customer behavior events at scale, and powers the analytical capabilities our clients rely on.

Responsibilities

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

Requirements

• Strong Scala skills, with production experience using an effect system (Cats Effect, ZIO, or Akka/Pekko).
• Working knowledge of Apache Kafka - understanding partitioning, delivery guarantees, consumer groups, rebalance issues, and consumer lag.
• 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.

Nice to Have

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

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.

About the Company

We'd love to hear from you. Apply now and join our team.

Location: Cracow, Poland (Hybrid)

Salary: 7 000 - 9 000 PLN net/month (UZ/B2B)

Employment Type: Full-time