Senior Full Stack Engineer (Java+Angular) for Enterprise AdTech

Sigma Software; Warszawa; On-site; PLN 180,000 - 300,000; Full time

Job summary

Sigma Software in Warszawa is seeking a strong middle/senior Full Stack Developer (Java+Angular) to join a large AdTech platform. You will design, develop, and maintain scalable enterprise applications, ensure performance, and integrate with external services.

The role requires 5+ years of experience, hands-on Java/Spring, Angular, AWS, REST, and strong English. You will work in a distributed team, contribute to architecture, and drive quality improvements.

Qualifications

• 5+ years of commercial software development experience.
• Strong hands-on experience with Java and Spring Framework.
• Strong practical experience with Angular.
• Experience building scalable enterprise-level applications.
• Experience with AWS cloud services.
• Good understanding of software engineering principles and system design.
• Experience working with REST APIs and integrations.
• Ability to work independently and proactively solve technical challenges.
• Strong analytical and problem-solving skills.
• Experience writing maintainable and testable code.
• Good communication and collaboration skills.
• Upper-Intermediate or higher level of English.

Responsibilities

• Design, develop, and maintain scalable Full Stack solutions using Java, Spring, and Angular.
• Develop and support complex business logic related to advertising campaign management.
• Participate in architecture discussions and contribute to technical solution design.
• Build reliable, maintainable, and high-performance enterprise applications.
• Improve system scalability, reliability, and overall platform performance.
• Integrate with external advertising and media-related services.
• Write clean, maintainable, and well-tested code following engineering best practices.
• Collaborate with developers, Architects, QA engineers, and Project Managers.
• Take ownership of technical challenges and proactively drive solutions.
• Contribute to continuous improvement of development processes and engineering standards.

Skills

Java

Spring Framework

Angular

REST APIs

AWS

English

Tools

Jenkins

Terraform

Claude

Codex

Job description

Sigma Software in Warszawa is seeking a strong middle/senior Full Stack Developer (Java+Angular) to join a large AdTech platform. You will design, develop, and maintain scalable enterprise applications, ensure performance, and integrate with external services.

The role requires 5+ years of experience, hands-on Java/Spring, Angular, AWS, REST, and strong English. You will work in a distributed team, contribute to architecture, and drive quality improvements.