Senior Backend Engineer: Scalable Microservices & Cloud

PixelChain; Warszawa; On-site; PLN 210,000 - 270,000; Full time

Benefits offered by this job

Flight ticket and visa sponsorship

Top-tier equipment (MacBook, iPhone)

Job summary

PixelChain is seeking an experienced backend engineer to help scale our fintech, iGaming, and marketing platforms. You will own the architecture and performance of core systems, partnering with product teams to ensure services stay fast, reliable, and ready for expansion into new markets.

As part of the engineering team, you will design and implement microservices, optimize data storage, and contribute to testing, deployment, and incident response in an Agile environment, with a focus on Java

Qualifications

• Solid grounding in data structures, algorithms, and system design fundamentals.
• 5+ years of hands-on backend development experience with Java / Java Core.
• Practical experience designing and implementing microservices architectures.
• Comfortable working across multiple database technologies — MySQL, MongoDB, Redis, and other NoSQL stores.
• Experience with messaging systems such as Kafka, RabbitMQ, or ActiveMQ.
• Working knowledge of AWS and Docker for cloud deployment and containerization.
• Skilled in performance tuning — indexing, partitioning, sharding, and concurrent-programming optimization.
• Hands-on testing experience with JUnit and Mockito.
• Comfortable working within Agile development environments.

Responsibilities

• Partner with product teams to turn user and business requirements into scalable, well-architected backend solutions.
• Own the full lifecycle of web application development, from design through deployment.
• Design and build system architectures that stay fast and reliable as usage grows.
• Write unit and integration tests that catch problems before they reach production.
• Take part in incident response and post-mortems, feeding lessons back into more resilient systems.
• Pitch in on other engineering tasks as the team's priorities shift.

Skills

Java

System design

Microservices

Performance tuning

JUnit/Mockito

Agile

AWS

Docker

Tools

MySQL

MongoDB

Redis

Kafka

RabbitMQ

ActiveMQ

Job description

PixelChain is seeking an experienced backend engineer to help scale our fintech, iGaming, and marketing platforms. You will own the architecture and performance of core systems, partnering with product teams to ensure services stay fast, reliable, and ready for expansion into new markets.

As part of the engineering team, you will design and implement microservices, optimize data storage, and contribute to testing, deployment, and incident response in an Agile environment, with a focus on Java