Staff Software Engineer
CompanyApex Fintech Solutions UK
Location
Belfast, Northern Ireland, United Kingdom
Employment TypeFull-time
Posted At4/19/2026
UK Visa Sponsorship Analytics
Occupation TypeProgrammers and software development professionals
Occupation Code Skill LevelHigher Skilled
Sponsorship Salary Threshold
£54,700
(£28.05 per hour)
Occupation rate applies
Above analytics are generated algorithmically based on job titles and may not always be the same as the company's job classification. You can also check detailed occupation eligibility, and salary criteria on our UK Visa Eligible Occupations & Salary Thresholds page.
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Description
Who We Are
Apex Fintech Solutions (AFS) powers innovation and the future of digital wealth management by processing millions of transactions daily, to simplify, automate, and facilitate access to financial markets for all. Our robust suite of fintech solutions enables us to support clients such as Stash, Betterment, SoFi, and Webull, and more than 20 million of our clients' customers.
Collectively, AFS creates an environment in which companies with the biggest ideas in fintech are empowered to change the world. As a global organization, we have offices in Austin, Dallas, Chicago, New York, Portland, Belfast, and Manila.
If you are seeking a fast-paced and entrepreneurial environment where you'll have the opportunity to make an immediate impact, and you have the guts to change everything, this is the place for you.
AFS has received a number of prestigious industry awards, including:
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. Due to the space we innovate in, your products will process billions of transactions per day in real-time and power both startup and established industry participants.
As a Staff Platform Engineer in this multi-disciplinary team, you will play an integral role in designing, implementing, and optimizing our Billing services, tooling, and infrastructure to ensure robust, scalable and accurate billing to our clients.
Duties/Responsibilities
Apex Fintech Solutions (AFS) powers innovation and the future of digital wealth management by processing millions of transactions daily, to simplify, automate, and facilitate access to financial markets for all. Our robust suite of fintech solutions enables us to support clients such as Stash, Betterment, SoFi, and Webull, and more than 20 million of our clients' customers.
Collectively, AFS creates an environment in which companies with the biggest ideas in fintech are empowered to change the world. As a global organization, we have offices in Austin, Dallas, Chicago, New York, Portland, Belfast, and Manila.
If you are seeking a fast-paced and entrepreneurial environment where you'll have the opportunity to make an immediate impact, and you have the guts to change everything, this is the place for you.
AFS has received a number of prestigious industry awards, including:
- 2021, 2020, 2019, and 2018 Best Wealth Management Company - presented by Fintech Breakthrough Awards
- 2021 Most Innovative Companies - presented by Fast Company
- 2021 Best API & Best Trading Technology - presented by Global Fintech Awards
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. Due to the space we innovate in, your products will process billions of transactions per day in real-time and power both startup and established industry participants.
As a Staff Platform Engineer in this multi-disciplinary team, you will play an integral role in designing, implementing, and optimizing our Billing services, tooling, and infrastructure to ensure robust, scalable and accurate billing to our clients.
Duties/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 handle high-volume financial calculations and reporting at scale
- Mentor and guide engineers across multiple teams, establishing best practices for Java development, Bazel build configurations, database migrations with Flyway, and event-driven architectures
- Own system reliability and operational excellence, implementing comprehensive monitoring with Datadog, designing robust error handling and validation, and ensuring SLOs are met for critical financial processes
- Collaborate cross-functionally with product, finance, and compliance teams to translate business requirements into technical solutions, managing integrations with external financial systems and internal platform services
- Establish and maintain technical standards for the billing domain, including testing strategies, API design with gRPC and Protobuf, database schema evolution, and deployment practices across multiple environments
- Bachelor's degree in Computer Science, Engineering, or related field (or equivalent work experience) required; advanced degree preferred
- 8+ years of experience in software development with a deep knowledge in one or more programming languages, including Java, Python
- Experience with automated testing frameworks and methodologies for backend services
- Experience contributing to epics and participating in technical direction and implementation strategy for projects
- Expertise with containerization (Docker), orchestration (Kubernetes), cloud platforms (GCP, AWS), and infrastructure automation (Terraform, Ansible).
- Expertise in software release tooling, GitOps, and CI/CD practices.
- Excellent communication skills and the ability to collaborate effectively with cross-functional teams.
- Knowledge of API management methodologies, security practices, and traffic management strategies.
- This job operates in a hybrid, office environment environment 2 days per week.
Please note this job description is not designed to cover or contain a comprehensive listing of activities, duties, or responsibilities required of the employee for this job. Duties, responsibilities, and activities may change at any time with or without notice.
Our Rewards
We offer a robust package of employee perks and benefits, including a market-leading salary with an annual bonus, 28 days of annual leave plus 10 Northern Ireland national holidays, a training and development budget, and a pension matched up to 7%. Our benefits also cover private health insurance for medical, dental, and optical care, and life insurance. We emphasize work-life balance with flexible working hours, parental leave, a modern city center office, and a hybrid work schedule that allows for greater flexibility by partially working from home. Additional perks include monthly catered lunches, unlimited drinks and snacks, hackathon events, poker tournaments, and a charitable matching gift program.
EEO Statement
Apex Fintech Solutions is an equal opportunity employer that does not discriminate on the basis of race, color, religion, sex (including pregnancy, sexual orientation, and gender identity), national origin, age, disability, veteran status, marital status, or any other protected characteristic. Our hiring practices ensure that all qualified applicants receive fair consideration without regard to these characteristics.
Disability Statement
Apex Fintech Solutions is committed to creating an inclusive and accessible workplace for all candidates, including those with disabilities. We are dedicated to ensuring equal employment opportunities and providing reasonable accommodations to qualified individuals with disabilities. If you require reasonable accommodations to participate in the application or interview process, please submit your request via the Candidate Accommodation Requests Form. We will work with you to provide the necessary accommodations to ensure your full participation in our hiring process.
Disability Statement
Apex Fintech Solutions is committed to creating an inclusive and accessible workplace for all candidates, including those with disabilities. We are dedicated to ensuring equal employment opportunities and providing reasonable accommodations to qualified individuals with disabilities. If you require reasonable accommodations to participate in the application or interview process, please submit your request via the Candidate Accommodation Requests Form. We will work with you to provide the necessary accommodations to ensure your full participation in our hiring process.