Senior Software Engineer - Payments Modernisation

Role Overview We are seeking experienced Senior Software Engineers to join a mission-critical payments modernization program. This role focuses on stabilizing, upgrading, and modernizing legacy systems rather than building new features. You will play a key role in elevating engineering standards, improving system resilience, and ensuring compliance across core financial systems. This is an opportunity to work on high-impact platforms in a lean, high-performing team, contributing as a hands-on engineer with strong ownership.

Key Responsibilities

Lead modernization of legacy applications (Java 8 → Java 21+) to improve performance, maintainability, and compliance

Enhance application hygiene, including testing, observability, and system reliability

Implement and support containerized deployments using Kubernetes and cloud platforms (AWS preferred)

Work on mission-critical payment systems, ensuring stability and operational continuity

Collaborate closely with engineering leads in pair programming and technical design sessions

Identify and reduce technical debt across existing systems

Contribute as an independent engineer in a lean team with minimal supervision

Required Skills & Experience

Core Technical Skills:

Strong expertise in Java (preferably Java 21+) or Python

Experience working with microservices and containerization (Kubernetes)

Hands-on experience with AWS or similar cloud platforms

Solid understanding of software engineering best practices (testing, CI/CD, observability)

Domain Expertise:

Experience in financial services, fintech, or payments systems

Knowledge of payment processing (ACH, Swift, or similar) is highly desirable

Working Style:

Proven ability to work on legacy systems with modernization goals

Comfortable operating as a self-starter and individual contributor

Strong problem-solving skills with a focus on system improvement rather than greenfield development

Preferred Qualifications

Experience upgrading large-scale systems across Java versions

Familiarity with compliance-driven environments (audit, regulatory frameworks)

Exposure to observability tools and automated testing frameworks

Prior experience in high-availability or mission-critical systems

What We're Looking For

Engineers who thrive on improving and modernizing existing systems

Individuals who can lead through expertise and initiative, not just follow requirements

Team players who value clear communication and strong collaboration in lean teams

Professionals who understand the realities and challenges of legacy system transformation

We regret to inform that only shortlisted candidates will be notified.

EA Registration No: R21103843, Andrew Jonas Matthew

Allegis Group Singapore Pte Ltd, Company Reg No. 200909448N, EA Licence No. 10C4544