Senior Software Developer

Cambridge Mercantile Corp. UK; City Of London; On-site; GBP 90,000 - 120,000; Full time

Benefits offered by this job

4x life insurance

Pension scheme – 5% employer

Private healthcare

25 days’ holiday, buy/sell option

LinkedIn Learning

Gratitudes discounts

Job summary

Corpay is seeking a Senior Software Developer in London to build and evolve high‑quality payment and FX platforms. You will work across frontend and backend, partnering with product owners and QA to deliver scalable software in a financial technology environment.

You will mentor peers, own complex features from discovery to delivery, and contribute to secure, maintainable code while aligning with Agile practices and CI pipelines.

Qualifications

• Bachelor’s degree in Computer Science, Software Engineering, or equivalent professional experience.
• 8+ years of professional software development experience.
• Strong experience with C# and .NET development across web and/or desktop applications.
• Experience with JavaScript or TypeScript.
• Strong knowledge of SQL Server, relational database design, stored procedures, and T-SQL.
• Experience developing HTTP APIs and service-oriented or distributed systems.
• Experience working with message queues, service buses, asynchronous processing, or event-driven architectures.
• Experience writing unit tests and applying modern software engineering practices.
• Experience working within Agile software development teams.

Responsibilities

• Collaborating with business stakeholders to gather requirements and address technical questions.
• Providing technical guidance to other developers, contributing to architectural decisions, and helping improve engineering practices across the team.
• Breaking down technical work into actionable tasks to meet project deadlines and business objectives.
• Designing, developing, and maintaining scalable front-end and back-end applications.
• Writing clean, efficient, and maintainable code by following Agile development practices, unit testing standards, continuous integration, and clean coding principles.
• Participating in code reviews to maintain high-quality software standards.
• Taking ownership of complex technical challenges from discovery through delivery while balancing maintainability, performance, security, and business value.
• Developing and maintaining application features with a focus on scalability, reliability, and performance.
• Collaborating closely with Product Owners, Scrum Masters, QA Engineers, and other Software Developers throughout the software development lifecycle.
• Troubleshooting, debugging, and optimizing existing systems to ensure stability and performance.

Skills

C# & .NET

JavaScript/TypeScript

SQL Server

APIs

Messaging queues

Unit tests

Agile

Education

Bachelor's degree in Computer Science or related field

Tools

React

Blazor

VB.NET

Job description

Your role

What you’ll be doing Senior Software Developer What We Need Corpay is currently looking to hire a Senior Software Developer within our Cross‑Border division. This position falls under our Corporate Payments line of business and is located in London. In this role, you will help evolve the platforms that power Corpay Cross‑Border’s international payments and foreign exchange capabilities. This is a hands‑on engineering role suited to someone who enjoys solving complex, business‑critical problems, improving established systems, and delivering secure, scalable software in a financial technology environment. You will report directly to the Engineering Manager and regularly collaborate with Product Owners, Scrum Masters, QA Engineers, business stakeholders, and other Software Developers to design, build, test, and maintain applications that support real‑world payment and foreign exchange workflows.

How We Work

• Assigned workspace in our London office
• Company‑issued equipment
• Formal, hands‑on training

Role Responsibilities

• Collaborating with business stakeholders to gather requirements and address technical questions.
• Providing technical guidance to other developers, contributing to architectural decisions, and helping improve engineering practices across the team.
• Breaking down technical work into actionable tasks to meet project deadlines and business objectives.
• Designing, developing, and maintaining scalable front‑end and back‑end applications.
• Writing clean, efficient, and maintainable code by following Agile development practices, unit testing standards, continuous integration, and clean coding principles.
• Participating in code reviews to maintain high‑quality software standards.
• Taking ownership of complex technical challenges from discovery through delivery while balancing maintainability, performance, security, and business value.
• Developing and maintaining application features with a focus on scalability, reliability, and performance.
• Collaborating closely with Product Owners, Scrum Masters, QA Engineers, and other Software Developers throughout the software development lifecycle.
• Troubleshooting, debugging, and optimizing existing systems to ensure stability and performance.

Qualifications & Skills

• Bachelor’s degree in Computer Science, Software Engineering, or equivalent professional experience.
• 8+ years of professional software development experience.
• Strong experience with C# and .NET development across web and/or desktop applications.
• Experience with JavaScript or TypeScript.
• Strong knowledge of SQL Server, relational database design, stored procedures, and T‑SQL.
• Experience developing HTTP APIs and service‑oriented or distributed systems.
• Experience working with message queues, service buses, asynchronous processing, or event‑driven architectures.
• Experience writing unit tests and applying modern software engineering practices.
• Experience working within Agile software development teams.

Preferred Qualifications

• Experience within payments, foreign exchange (FX), fintech, banking, or other regulated financial services industries.
• Experience modernising legacy applications built with VB.NET, VB6, or older .NET Framework technologies.
• Experience developing front‑end applications using React, Blazor, or similar frameworks.
• Experience integrating third‑party platforms and external vendor systems.
• Experience with performance tuning, monitoring, observability, and production support.
• Strong product mindset with the ability to translate business requirements into technical solutions.
• Commitment to delivering high‑quality, reliable, and scalable software.
• Excellent collaboration and communication skills.
• Adaptability, including the ability to work through ambiguity, define scope, and estimate delivery timelines.
• Passion for continuous learning and adopting new technologies.

Benefits & Perks

• 4x life insurance
• Pension scheme – 5% employer contribution
• Private healthcare
• 25 days’ holiday, plus the option to buy or sell holiday
• Access to LinkedIn Learning
• Free rewards and discounts via Gratitudes

About Corpay

Corpay is a global technology organization that is leading the future of commercial payments with a culture of innovation that drives us to constantly create new and better ways to pay. Our specialized payment solutions help businesses control, simplify, and secure payment for fuel, general payables, toll and lodging expenses. Millions of people in over 80 countries around the world use our solutions for their payments. At Corpay, we are committed to fostering an inclusive and respectful workplace where employees are valued for their diverse perspectives, experiences, and contributions. We believe that diversity, equity, and inclusion strengthen our teams, drive innovation, and support our continued success globally.

As part of our hiring process, offers of employment may be subject to the successful completion of pre‑employment screening conducted by an authorized third‑party provider, in accordance with applicable laws and Corpay policies. Screening requirements may include employment references, identity verification, criminal record checks, financial or sanctions screening, and other background checks relevant to the role and permitted by local law.

Notice to Recruitment Agencies and Search Firms: Corpay does not accept unsolicited resumes from agencies or search firms without a valid written agreement in place. Any unsolicited candidate submissions will become the property of Corpay, and no fees will be paid related to such submissions. Learn more about Corpay: https://www.corpay.com

Transparency & Compliance

Equal Opportunity Employer Corpay is committed to providing equal employment opportunities to all applicants and employees. Employment decisions are made without regard to race, color, religion, sex (including pregnancy), gender, gender identity or expression, sexual orientation, national origin, ancestry, age, disability, marital status, genetic information, military or veteran status, or any other characteristic protected by applicable law.

Corpay is committed to fostering an inclusive workplace where individuals are respected and valued for their diverse perspectives, experiences, and contributions. If you require reasonable accommodation during any part of the application or interview process, please notify a representative of the Human Resources Department.

Use of Artificial Intelligence in Hiring

Corpay may use artificial intelligence (AI) and other technology-enabled tools to support certain aspects of the recruitment process, such as application screening, candidate assessment, or interview scheduling. These tools are designed to enhance efficiency, consistency, and fairness throughout the hiring process. AI tools do not make final hiring decisions. All employment decisions involve human review. Corpay is committed to the responsible use of AI, including appropriate oversight and safeguards designed to support fair and unbiased outcomes.

Candidate Privacy Notice

For information about how Corpay processes personal information during the recruitment process, please review our Candidate Privacy Notice: https://www.corpay.com/privacy-policy.

Pay Philosophy

Corpay is committed to fair, equitable, and transparent compensation practices. Compensation decisions are based on objective, job‑related factors including skills, experience, qualifications, and market benchmarks. Where required by applicable law, salary or compensation ranges will be included in the job posting or provided prior to the interview process, where required by applicable law. Additional compensation elements such as bonuses, incentives, benefits, or variable pay may apply where applicable.

Fast‑growing, global, rewarding, fun, involved – at Corpay, we are all of these and more. If you are an experienced and self‑motivated professional who can perform at a high level, you will be rewarded. If you have great ideas, we want to hear them. If you want your career to grow at the same rapid pace as our organization, this is the place for you. Whatever your area of expertise, you can take it to the next level at Corpay.