Senior Java Developer

Warsaw, PolandHybridFull-time5+ yrs experiencePosted 1mo ago

All Sigma Software jobs

Job description

Design, develop, and maintain backend services for the payments platform using Java and Spring Boot
Ensure high availability, scalability, and performance of transaction processing systems
Collaborate with cross-functional teams to define technical requirements and deliver solutions end-to-end
Implement integrations with payment service providers and internal systems
Participate in architectural discussions and contribute to system evolution in a microservices environment
Monitor, troubleshoot, and optimize services in production
Ensure compliance with security, regulatory, and operational standards
Drive continuous improvement in code quality, testing, and deployment practices

5+ years of commercial experience with Java and Spring Boot
Strong experience with MySQL and Kafka
Proven track record working with microservices architecture in high-traffic, high-load systems
Experience developing high-performance backend solutions for transaction-heavy platforms
Ownership mindset with ability to deliver services end-to-end
Excellent communication skills in English (C1 level), both written and verbal
Experience with Kotlin

Job details are sourced from the employer's original posting.

Open job posting

About the company

Sigma Software

We are looking for a Senior Go Developer to join our dynamic team and work on cutting-edge AdTech solutions. This role offers the opportunity to experiment with AI, LLMs, and emerging technologies while solving complex challenges in large-scale data processing.  CUSTOMER Our customer is a global leader in contextual advertising with more than 500 employees worldwide. They specialize in delivering highly relevant ads by leveraging AI, real-time technology, and large-scale data processing. Operating in the AdTech industry, they are recognized for innovation in Connected TV (CTV) advertising. The team you will join works with the agility of a startup while benefiting from the resources of a global organization. PROJECT You will contribute to the development of a smart advertising platform that processes terabytes of data to understand audiences and deliver precise, contextual ads. The platform combines AI, LLMs, and emerging technologies to push the boundaries of CTV advertising. In this role, you will own innovation end-to-end — from research and prototyping to delivering production-ready solutions.

View all Sigma Software jobs

Industry: AdTech
Open roles: 49