X4 Technology
Software Engineer
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Job Title: Software Implementation Engineer
Location: Hybrid In London (2 days per week)
Employment Type: Permanent
Salary: £80,000 - £110,000 (based on experience level)
Start Date: Immediate
Industry: Payments
We're looking for an experienced Software Engineer to join a high-performing engineering team working on sophisticated technology within the payments and financial services space.
You'll contribute across the full software development lifecycle, from technical design and architecture through to hands-on development, testing, and continuous improvement.
You'll work closely with other engineers in an Agile environment, helping to build high-quality, reusable software that can operate at scale within a highly transactional environment.
Software Engineer – Key Responsibilities
- Design, develop, and maintain high-quality Java applications.
- Contribute to architecture and technical design decisions.
- Build scalable, resilient, and highly available distributed systems.
- Work with asynchronous and event-driven architectures.
- Develop reusable code, components, and libraries.
- Optimise applications for performance, scalability, and reliability.
- Follow TDD/BDD and established engineering standards.
- Contribute to technical discussions and problem solving across the engineering team.
- Work within a collaborative Agile/Kanban environment.
- Contribute to CI/CD and automated delivery processes.
- Take ownership of complex engineering challenges and continually look for ways to improve the product and development process.
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Software Engineer – Key Skills Required
- Strong commercial Java 11+ experience.
- Experience with Spring and modern Java development practices.
- Experience with reactive and/or asynchronous programming.
- A good understanding of event-driven systems and distributed architectures.
- Experience building software where availability, resilience, performance, and scalability are important.
- Experience working within payments, banking, financial services, transaction processing, or another highly transactional environment.
- Experience working in Agile engineering teams.
- Experience with CI/CD and automated software delivery.
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Nice to have
- Kafka and/or JMS.
- Akka or another reactive framework.
- Docker and Kubernetes.
- MongoDB or other document-based databases.
- Ansible / infrastructure automation.
- Unix/Linux administration and scripting.
- DevOps within highly transactional environments.
- Angular or modern front-end technologies.
Please apply now if this role is of interest.
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