[Hiring] Senior Software Engineer @Entersekt

Role Description

The ideal candidate is a senior backend engineer with strong Java expertise who is comfortable working on security‑critical, regulated systems. You have experience designing, building and maintaining distributed backend services, enjoy taking ownership of complex technical problems, and are able to balance delivery with long‑term maintainability.

You are confident working independently, contributing to architectural decisions, and mentoring other engineers, while collaborating closely with product, QA and DevOps teams. Experience in payments, fintech or other high‑security environments will be a strong advantage.

As a Senior Software Engineer in the 3DS Payments team, you will work on backend services that support secure payment authentication and the handling of sensitive data. The role focuses on developing and maintaining Java‑based services, improving system reliability and performance, and ensuring compliance with security and regulatory requirements.

You will contribute to system design, guide technical decision‑making, and help drive continuous improvement across the codebase and platform.

Responsibilities

• Design, develop and maintain backend services within the 3DS Payment’s platform
• Build and maintain RESTful APIs and distributed systems
• Develop and support Java applications deployed on Apache Tomcat
• Design, optimise and maintain MySQL database schemas and queries
• Identify and resolve performance, stability and production issues
• Contribute to architectural decisions and technical tradeoffs
• Ensure systems adhere to secure coding practices and compliance requirements
• Collaborate with product, QA and DevOps teams throughout the delivery lifecycle
• Mentor and support other engineers within the team
• Take ownership of features and services from design through to production

Qualifications

• 5 - 8+ years of professional software engineering experience with strong proficiency in Java (Java 11+ required; newer LTS versions a plus).
• Experience developing applications running on Apache Tomcat.
• Solid experience with MySQL or similar relational databases, including:
  • Schema design
  • Query optimisation and indexing
  • Performance tuning and troubleshooting
• Experience building RESTful APIs and working with distributed systems.
• Strong understanding of software design principles (OOP, SOLID, clean architecture).
• Experience using Git or similar version control systems.
• Strong understanding of secure coding practices, including OWASP Top 10.
• Experience working in regulated environments (e.g. PCI DSS, GDPR).
• Experience handling sensitive data such as cardholder data or PII.

Requirements

• Nice‑to‑have:
  • Experience with AWS (EC2, RDS, S3, IAM, CloudWatch)
  • Exposure to cloud‑native or cloud‑migrated architectures
  • Experience with Docker and/or Kubernetes
  • Familiarity with CI/CD pipelines and DevOps practices
  • Experience in payments, fintech or other high‑security domains

Personality Attributes

• Strong problem‑solving and analytical thinking skills.
• Clear and effective communicator with both technical and non‑technical stakeholders.
• Comfortable working independently and taking ownership.
• Collaborative team player with a pragmatic, delivery‑focused mindset.
• Strong attention to quality, security and maintainability.