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Offer summary
(Summary generated by AI based on the full job description)
The project covers backend for an event-processing and analytics platform powering personalized customer experience. Core technologies are Scala, Apache Kafka, ElasticSearch, ScyllaDB, Kubernetes, Azure/GCP and observability tools like OpenTelemetry and Jaeger. Responsibilities include designing and building systems handling up to 30k events/s, ensuring reliable data storage and correctness, performance optimization, microservices architecture design and troubleshooting distributed environments. Offer includes technical support, opportunities for growth and benefits: sports cost sharing, private medical care, remote work and flexible hours.
from: 28 October 2026
to: 27 November 2026
20 000 - 28 000 złnet (+ VAT)/ mth.B2B contract (full-time)
Offer parameters
level:senior
working mode:hybrid
Kraków, Krowodrza
Requirements
Expected technologies
Apache Kafka
SQL
Optional technologies
OpenTelemetry
Jaeger
Microsoft Azure
Google Cloud Platform
Our requirements
- Strong Scala skills, with production experience using an effect system (Cats Effect, ZIO, or Akka/Pekko) — we care more about depth of understanding than years on your CV.
- Experience designing or significantly contributing to event-driven systems in production — comfortable reasoning about ordering guarantees, idempotency, replay, and failure modes.
- Strong working knowledge of Apache Kafka — not just as a consumer API, but understanding partitioning, delivery guarantees, consumer groups, rebalance issues, and consumer lag.
- Hands-on Kubernetes skills sufficient to independently diagnose pod issues, resource limits, HPA behavior, and networking.
- Experience with both SQL and NoSQL databases, with a clear sense of when each is the right tool.
- Experience with microservices architecture, including awareness of common pitfalls (distributed transactions, eventual consistency, contract versioning).
- Ability to design for scale and growth — partitioning, sharding, tenant isolation, backpressure.
- Strong debugging and troubleshooting skills in distributed environments.
Optional
- Solid grasp of JVM internals — GC behavior, profiling, heap and thread dump analysis.
- Experience with observability: distributed tracing (OpenTelemetry, Jaeger), structured logging, metrics — for us this is core to daily work.
- Experience working in a cloud environment (Azure / GCP) — our stack runs primarily on AKS.
Your responsibilities
You'll be working on software that:
What will you do on a daily basis?
About the project
Synerise is looking for a Senior Scala Engineer - to design, build, and evolve backend for event processing and analytics platform that powers AI-driven customer experience.
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.
Having such great solutions, we are looking for a highly motivated Senior Scala 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 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 — not an afterthought. 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 — not to replace engineering judgment, but to move faster on the parts that benefit from it.
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. It's the data backbone the rest of the product is built on.
Interested in this role?
We'd love to hear from you. Apply now and join our team.
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.
Senior Scala Engineer
20k–28k zł / mth. (B2B)
I apply to:
Synerise S.A.
Kraków, Krowodrza
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