Senior Software Development Engineer

WEX; London; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

A leading company in financial technology is seeking a Senior Software Development Engineer to architect and build scalable backend systems. This role involves leading initiatives across teams, focusing on mobility payment systems, with flexible hybrid working options. Candidates should possess strong technical leadership skills in Java and cloud-native environments, and will benefit from a competitive salary and comprehensive perks.

Benefits

Annual Bonus

Industry leading pension scheme

25 days holiday plus bank holidays

Life assurance

Income protection

Discount & Perks platform

Employee wellbeing

Qualifications

• Professional software development experience.
• Proven expertise in building distributed backend systems.
• Strong technical leadership in Java and microservices.

Responsibilities

• Architect and build distributed, secure, and scalable backend systems.
• Lead large-scale, cross-team engineering initiatives.
• Drive service reliability and performance improvements.

Skills

Leadership

Communication

Collaboration

Tools

Java

Spring Boot

AWS

Docker

Kubernetes

Kafka

gRPC

Job description

SENIOR SOFTWARE DEVELOPMENT ENGINEER / LONDON OR MANCHESTER / HYBRID, AD HOC OFFICE VISITS / COMPETITIVE BASIC BETWEEN £80000-£100000 DEPENDENT UPON EXPERIENCE / PLUS BENEFITS

About The Team / Role

WEX is a global leader in financial technology solutions, simplifying the complexities of payment systems across continents and industries. With over 7,000 WEXers distributed across more than 40 countries, we support Fleet, Corporate Payments, and Benefits businesses. At WEX, we strive to modernize payment systems and empower our partners through innovative and secure solutions.

Scope of Role

This role is critical in building the technology that powers mobility payment systems used by fleets across Europe and Asia Pacific. As a Senior Software Development Engineer you will serve as a senior individual contributor driving architecture, technical standards, and engineering practices across teams. You will lead complex system design initiatives and contribute to shaping long-term platform evolution.

This position is based in our London office, with flexible hybrid working options. It offers the opportunity to work on global mobility products while contributing directly to our regional strategy and technical leadership in the UK.

What’s on offer?

• Highly Competitive basic salary of between £80000-£100000 (Dependent on experience)
• Annual Bonus
• 40 hour week- Monday to Friday
• Hybrid working
• Industry leading pension scheme
• 25 days holiday plus bank holidays- with the opportunity to purchase additional holidays
• Life assurance
• Income protection
• Discount & Perks platform
• Employee wellbeing

How you’ll make an impact

As a Software Development Engineer, you will:

• Architect and build distributed, secure, and scalable backend systems.
• Lead large-scale, cross-team engineering initiatives and drive alignment.
• Drive service reliability, observability, and performance improvements.
• Explore and apply AI/ML capabilities for fraud detection and automation.
• Review and guide the design and implementation work of engineers across teams.
• Coach, mentor, and influence engineering culture and technical standards.
• Collaborate with product, design, and engineering leaders to align roadmaps.

Experience You’ll Bring

• Professional software development experience.
• Proven expertise in building and operating distributed backend systems.
• Strong technical leadership in Java, Spring Boot, and microservices.
• Deep understanding of cloud-native environments (AWS, Docker, Kubernetes).
• Experience with messaging systems (Kafka), and gRPC APIs.
• Working knowledge of AI/ML integration in backend services.
• Excellent communication, collaboration, and mentorship skills.

Why Join WEX?

At WEX, you’ll join a forward-thinking engineering team solving high-scale, high-impact problems in the global mobility and payments space. You’ll be empowered to innovate, lead, and grow your career while contributing to solutions that fuel fleets and businesses around the world.

In our London hub, you’ll play a visible role in regional technical direction while connecting with global engineering peers. We offer flexible hybrid work, a collaborative engineering culture, and meaningful impact on mission-critical systems.

You'll work with a globally distributed team that values innovation, continuous learning, and engineering excellence. We invest in our people through mentorship programs, technical leadership tracks, and regular learning opportunities—your growth is our priority.

WEX is proud to be an equal opportunity employer. We’re committed to creating a welcoming environment where everyone can thrive.

What’s Next?

If you have the skills and passion to carry out our Senior Software Development Engineer role we would love to hear from you. APPLY NOW for immediate consideration.

Due to the volume of applications received, unfortunately it is not possible to respond to each one individually, applicants that are shortlisted will be contacted within one week of application

We do not accept speculative CVs. Any CV received by WEX will be treated as a gift and eligible for an agency fee. PSL agencies should only send CVs if authorised to do so by the Talent Acquisition team.