Software Engineer II

JobsCloseBy Editorial Insights

Join PDI Technologies in Southampton as Software Engineer II on the Payments Switch team, a hybrid role building secure, high-volume payment systems used by millions of transactions. You’ll develop web UIs and Java services, integrate with third-party systems, troubleshoot with urgency, and contribute to design decisions across product, QA, DevOps and infrastructure. The role prizes reliability, security, collaboration, and continuous improvement, with occasional after-hours work fairly rotating. Qualifications include a degree in CS or related field or equivalent, three to six years of software development experience, strong Java and SQL, familiarity with payments tech (EMV, contactless), C#, Vaadin, and experience with Azure DevOps and Jira. Tips: tailor your résumé to payments, quantify impact, show cross-functional teamwork and clear communication.

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At PDI Technologies, we empower some of the world's leading convenience retail and petroleum brands with cutting-edge technology solutions that drive growth and operational efficiency.
By “Connecting Convenience” across the globe, we empower businesses to increase productivity, make more informed decisions, and engage faster with customers through loyalty programs, shopper insights, and unmatched real-time market intelligence via mobile applications, such as GasBuddy.  We’re a global team committed to excellence, collaboration, and driving real impact. Explore our opportunities and become part of a company that values diversity, integrity, and growth.
Role Overview
We are looking for a talented Software Engineer to join our Payments Switch team in the South of the UK. This hybrid role offers the opportunity to work on critical payment systems, developing secure, high-performance applications that support millions of transactions every day. You’ll collaborate across product, QA, DevOps, and infrastructure teams, solving complex technical challenges and helping shape the future of our payment gateway.

Key Responsibilities

• Develop and maintain Web UIs, Java web services, and applications to support our payment gateway.
• Integrate with third-party applications and protocols, ensuring seamless and secure connectivity.
• Troubleshoot, test, and validate software issues; resolve them with urgency and maintain thorough documentation of all solutions.
• Participate in design and architecture decisions for new and existing applications, proactively escalating issues and seeking input to overcome obstacles.
• Identify, diagnose, and correct software issues within both in-house code and third-party applications.
• Perform testing to ensure systems meet documented user requirements.
• Use a disciplined approach in an Agile environment to analyse and determine preferred solutions to technical challenges.
• Collaborate with QA Engineers on test plans; perform engineering-level testing, debugging, and issue resolution across development and production environments.
• Work closely with DevOps, Infrastructure, and Support teams to deliver robust, scalable, and high-availability solutions.
• Contribute to technical discussions on scalability, performance optimisation, and best practices.
• There may be occasional requirements to support the team outside of standard working hours (for example evenings or weekends). This is managed fairly on a rotating basis, and we work to ensure it has as little impact as possible on your personal or family time.

Qualifications

• Degree in Computer Science, Software Engineering, Information Systems, or another numerate discipline (e.g. Physics, Mathematics, Engineering). Equivalent professional experience or recognised industry certifications will also be considered.
• Experience in software design and development, ideally 3–6 years, though we are open to candidates with less or more experience if they can demonstrate the required skills.
• Strong proficiency in Java and SQL.
• Experience in payments technologies (e.g., EMV, contactless), C#, and Vaadin is highly desirable.
• Solid understanding of databases and operating systems.
• Familiarity with mainstream SDLC tools such as Azure DevOps (ADO) and Jira.
• Strong analytical and problem-solving skills with the ability to troubleshoot complex issues.
• Demonstrated ability to work independently as a contributing member of a fast-paced team.
• Excellent verbal and written communication skills.
• Self-motivated, resilient under pressure, open to feedback, and committed to delivering high-quality solutions.
• Knowledge of ACI Postilion is an advantage.

Behavioural Competencies

• Accountability – takes ownership of deliverables and commitments.
• Manages complexity – effectively handles ambiguity and multiple priorities.
• Process optimisation – improves workflows for efficiency and quality.
• Communication – conveys information clearly and constructively.
• Collaboration – works effectively across teams to achieve shared goals.
• Adaptability – comfortable learning new technologies and adjusting to evolving requirements.
• Customer focus – recognises the importance of reliability and security in payment systems.
• Ownership – demonstrates responsibility for deadlines, quality, and continuous improvement.

PDI is committed to offering a well-rounded benefits program, designed to support and care for you, and your family throughout your life and career.  This includes a competitive salary, market-competitive benefits, and a quarterly perks program. We encourage a good work-life balance with ample time off and, where appropriate, hybrid working arrangements.  Employees have access to continuous learning, professional certifications, and leadership development opportunities. Our global culture fosters diversity, inclusion, and values authenticity, trust, curiosity, and diversity of thought, ensuring a supportive environment for all.