Senior Backend Engineer: Scale Global Payments

Kustom; Stockholms kommun; On-site; SEK 900,000 - 1,300,000; Full time

Benefits offered by this job

Pension plan

Comprehensive health insurance

Wellness allowance 3000 SEK

Extra day off on major holidays

Job summary

Kustom is seeking a Backend Engineer to design and implement robust server-side solutions powering our Nordic digital checkout. In Stockholm-based teams you'll work with product managers and engineers to deliver high-performance, scalable applications that underlie our core payments platform.

You'll mentor peers, contribute to architectural decisions, and help shape our technical roadmap while maintaining a strong focus on reliability, security, and code quality in a fast-growing environment.

Qualifications

• Bachelor’s degree in Computer Science, Engineering, or a related field.
• 7+ years of professional backend development experience.
• Deep expertise in Java.
• Strong knowledge of Spring Framework and Spring Boot.
• Extensive experience with AWS cloud services and microservices architecture.
• Excellent understanding of database design and performance optimization.
• Experience with RESTful APIs and API security.
• Proven experience in leading and mentoring engineers.

Responsibilities

• Implement scalable, high-performance backend services powering our global payment infrastructure.
• Lead technical discussions and mentor junior team members while contributing to architectural decisions.
• Drive engineering excellence through code reviews, best practices, and documentation.
• Collaborate with Product and Design to implement robust technical solutions.
• Contribute to the technical roadmap and help shape the future of our platform.

Skills

Java

Spring Framework

Spring Boot

AWS

Distributed systems

REST APIs

Git & GitHub

API security

Technical leadership

Education

Bachelor’s degree in Computer Science, Engineering, or a related field

Tools

Git & GitHub

Job description

Kustom is seeking a Backend Engineer to design and implement robust server-side solutions powering our Nordic digital checkout. In Stockholm-based teams you'll work with product managers and engineers to deliver high-performance, scalable applications that underlie our core payments platform.

You'll mentor peers, contribute to architectural decisions, and help shape our technical roadmap while maintaining a strong focus on reliability, security, and code quality in a fast-growing environment.