Assignment description
Our client is a global leader in integrated payments, POS, and forecourt automation solutions for convenience retail. Their site controller powers terminals, pumps, payments, and back-office services at more than 10,000 sites worldwide, operating in a mission-critical, always-on environment.

They are seeking an experienced Software Developer to join an established R&D team, focusing on end-to-end payment integrations and implementations aligned with the ISO 8583 standard.
Key responsibilities include:
– Develop an ISO 8583 protocol plugin in the existing payment components within the Epsilon site controller
– Implementing and troubleshooting integrations together with Payment Service Providers (PSPs)
– Integration testing payment flows—from forecourt terminals and devices through to backend services
– Working within a Scrum team, contributing to sprint planning, reviews, and daily stand-ups
– Collaborating closely with QA, product owners, and project managers to deliver high-quality features

About the team
You will be the only one working with this specific customer but you will also be a part of a team working with other payment integrations in parallel.

Must haves
Required Experience:
– University degree in Computer Science or equivalent experience
– Proven experience with payment integrations using ISO 8583, POS, or regulated environments
– Experience working in agile teams and following modern engineering practices (code reviews, automated testing, CI, GitHub)
– Spoken and written English

Nice to Have:
– Experience with device communication, terminals, or embedded/edge systems
– Experience with unattended transaction flow (Pre-authorisation, Amendment, Settlement, Reversal, Reconciliation) and EMV (chip&pin + contactless)
– Experience with or willingness to work in C++

About the customer
The client is a leading global supplier of fuel dispensing equipment, fully integrated point of sale systems for the global petroleum marketplace with sales, manufacturing, research, development, and service locations in North and South America, Europe, Asia, the Pacific Rim and Australia.

Industries
Other