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Staff Software Engineer

Apex Fintech Solutions UK Ltd.

belfast, northern ireland, United-Kingdom Full-time June 06, 2026
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Vacancy Description

ABOUT THIS ROLE

We’re seeking an innovative, passionate, and forward‑thinking individual to join us as a Staff Software Engineer. This is an opportunity to join a fast‑paced team with the urgency of a startup and the expertise of an established organisation. Your products will process billions of transactions per day in real‑time and power both startup and established industry participants.

DUTIES AND RESPONSIBILITIES

  • Design and evolve microservices architecture for the billing platform, ensuring scalability, reliability, and maintainability across the distributed system.
  • Lead technical decision‑making for complex billing workflows involving rate configurations, charge calculations, settlement generation, and end‑customer processing, balancing business requirements with system performance and cost constraints.
  • Drive performance optimization of data‑intensive operations leveraging BigQuery, PostgreSQL, and caching strategies to handl...

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