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About the Role

This role is within the Banking and FX tribe, responsible for payment processing, FX pricing and trading, the ledger, reconciliation, bank integrations, FIX engine connectivity, payment compliance, and the client portal. You will build services in .NET 10 on Azure, focusing on asynchronous flows that require accuracy under challenging conditions like partner timeouts or duplicate messages. The work is end-to-end, covering the entire banking platform. You will be empowered to make design decisions within your domain, build, run, and own your services.

Responsibilities

Design, build, and run services in .NET 10 on Azure, managing them from initial commit through production support.
Develop asynchronous flows that maintain correctness during partial failures, timeouts, retries, and duplicate deliveries.
Contribute across the platform, including payment processing, FX, ledger, reconciliation, integrations, compliance, and the client portal.
Integrate with banking partners and payment schemes, including undocumented aspects.
Make and document architectural decisions for your domain, and present them to the tribe.
Incorporate security, availability, reliability, and observability from the outset, instrumenting services for clear monitoring.
Effectively utilize AI tooling, such as Claude Code, demonstrating judgment on its appropriate application.
Review code, elevate team standards, and mentor less experienced engineers.

Requirements

Extensive .NET experience with a track record of running self-owned services in production.
Production experience on cloud platforms (Azure preferred, AWS or GCP acceptable).
Proficiency with asynchronous, event-driven systems and their complexities (idempotency, ordering, retries, etc.).
Experience building security, availability, reliability, and observability into systems from the start.
Practical experience developing software with AI, understanding its benefits and limitations.
Strong SQL Server skills, including query and schema design under load, and familiarity with code-first ORMs (EF Core is a plus).
Solid testing instincts and the ability to articulate code protection against specific failure scenarios.
Comfort working in a regulated environment where financial transaction changes require evidence.
Clear communication skills with both technical and non-technical stakeholders.
Willingness to disagree and commit to decisions.
Eligibility to work in the UK.
Willingness to undergo full background checks.

Skills

.NET
Azure
Asynchronous systems
Event-driven architecture
Idempotency
Ordering
Retries
Poison messages
Security
Availability
Reliability
Observability
Grafana
Application Insights
AI tooling
SQL Server
Code-first ORMs
EF Core
Testing
Communication

Location

London

Work Type

Hybrid
Permanent
Full Time

Experience Level

Senior

Benefits

25 days’ annual leave plus bank holidays
An extra day off for your birthday
Holiday loyalty scheme
Work abroad scheme
Competitive pension scheme via salary exchange
Annual discretionary bonus scheme (eligible after probation)
Financial education, planning & coaching platform
Interest-free Season Ticket Loan for London travel
Salary exchange nursery fee scheme
Life Insurance
Healthcare platform (cashback on dental, optical & physio, virtual GP access, mental health support)
Additional wellbeing resources
Enhanced parental leave
Cycle to work scheme
Flexible benefits
Career development and progression tools
Opportunities to grow within a fast-scaling international business
Social events and celebrations

About the Company

We believe that diversity and inclusion are essential to our success. We are committed to fostering a culture where everyone feels valued and respected, regardless of their background, identity or experiences. By embracing diverse perspectives and promoting equity, we aim to create an environment where all employees can perform and reach their full potential.