Senior Software Engineer Payments Modernisation

ALLEGIS GROUP SINGAPORE PRIVATE LIMITED; Singapore; On-site; SGD 65,000 - 90,000; Full time

Job summary

Allegis Group Singapore Private Limited is seeking experienced Senior Software Engineers for a mission-critical payments modernization program. This role focuses on stabilizing and upgrading legacy systems, with an emphasis on improving engineering standards and compliance in core financial systems.

The ideal candidate should possess strong Java expertise, experience with Kubernetes, and a solid understanding of financial services. This is a hands-on role in a lean, high-performing team.

Qualifications

• Strong expertise in Java (preferably Java 21+) or Python.
• Experience with microservices and containerization (Kubernetes).
• Hands-on experience with AWS or similar cloud platforms.
• Solid understanding of software engineering best practices.

Responsibilities

• Lead modernization of legacy applications to improve performance and compliance.
• Enhance application hygiene, including testing and observability.
• Implement containerized deployments using Kubernetes.
• Ensure stability in mission-critical payment systems.
• Collaborate closely in technical design sessions.

Skills

Java (preferably Java 21+)

Kubernetes

AWS or similar cloud platforms

Microservices

Software engineering best practices

Job description

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