product design jobs

Senior Software Engineer (C# .NET)

Payments & Financial Infrastructure (Remote)

A fast-scaling global payments infrastructure company is building the financial rails that move real money across borders at speed, at scale, and with zero tolerance for failure. The platform powers cross-border transactions for SMEs and enterprises using a blend of traditional banking networks and stablecoin-backed blockchain rails . Transaction sizes are meaningful. The systems are live. The consequences are real.

The engineering team is distributed, lean, and fast-moving . Decisions are made quickly. Priorities shift. External partners change things without warning. The expectation is simple: build systems that hold up in the real world .

This is not a “feature factory” role.
This is financial infrastructure .

They are now hiring a Senior Software Engineer (C# .NET) to play a key role in shaping and stabilising their backend payments platform.

The Role (What You’re Really Signing Up For)

As a Senior Software Engineer, you’ll own and evolve critical backend services that sit directly in the path of money movement.

You’ll:

• Design and build API-driven services that process real payments

• Integrate with banks, payment providers, identity platforms, and blockchain rails

• Balance speed vs safety , often with incomplete information

• Take responsibility when things go wrong not just when they go right

This role suits someone who has already worked in regulated, high-risk systems and understands that elegance matters less than reliability.

What You’ll Be Doing

Backend & API Engineering

• Design and build secure, scalable APIs in .NET 8 / C#, powering payment and stablecoin transactions

• Own backend services end-to-end — from design through production support

• Build background processing, scheduled jobs, and webhook-driven workflows

• Integrate with third-party payment, banking, KYC and identity providers

Payments, Crypto & Real-World Complexity

• Implement logic that touches real money , not test data

• Build and maintain integrations across traditional rails and blockchain-backed stablecoin flows

• Create mock services and defensive layers for partners without stable test environments

• Design systems that expect breaking changes outside your control

Security, Risk & Compliance (By Design)

• Implement secure API patterns: authentication, encryption, auditing and monitoring

• Treat financial data with the caution it deserves

• Build systems that work within regulatory and compliance constraints rather than fighting them

Cloud, Infrastructure & Reliability

• Deploy and operate services on AWS (Lambda, EC2, DynamoDB, S3)

• Collaborate closely with DevOps on CI/CD pipelines (GitHub Actions)

• Build containerised services (Docker) designed for scalability and resilience

• Monitor production systems using tools like DataDog , catching issues early

Team & Ways of Working

• Work closely with product and engineering to convert evolving requirements into stable systems

• Review code, raise the bar, and challenge risky assumptions

• Be comfortable with context-switching between BAU stabilisation and new feature work

• Communicate clearly in a fully remote, distributed team

The Technical Stack

• Backend: .NET 8, C#, EF Core, Hangfire, RestEase, NUnit

• Data: PostgreSQL, DynamoDB

• Infrastructure: AWS, Docker, GitHub Actions

• Auth & Observability: Auth0, DataDog

• Domain: Payments, identity verification, banking partners, stablecoin rails

Who This Role Is Really For

You’ll Likely Thrive If You:

• Have 5+ years of building production backend systems in C# .NET

• Have worked in fintech, banking, payments, or regulated environments

• Understand that money is risk , not just data

• Are calm under pressure and methodical when things break

• Can operate without perfect specs or stable third parties

• Take ownership instead of waiting for instructions

• Prefer reliability and clarity over shiny greenfield builds

This Role Is Probably Not for You If You:

• Need everything fully specified before you start

• Prefer slow, linear delivery cycles

• Avoid BAU, optimisation, or legacy improvement work

• Get frustrated by external dependencies you don’t control

• Are uncomfortable dealing with production responsibility

(Both kinds of engineers are good — just not for this role.)

Nice-to-Haves (Not Deal Breakers)

• Experience with blockchain or stablecoin-based payment flows

• Hands-on use of DataDog for logs, metrics, and alerting

• Familiarity with Auth0 or similar auth providers

• Experience building integration-heavy systems with multiple external APIs

• Exposure to financial compliance or regulated domains
  

What Makes This Worthwhile

• Real ownership: You’ll work on systems that matter, not internal tooling nobody uses

• High impact: Your decisions directly affect real-world payments and customers

• Fast growth: Early-stage scale means fast learning and expanding responsibility

• Distributed team: Remote-first, pragmatic, outcome-focused

• Meaningful work: You’re enabling faster, more accessible financial infrastructure globally
  

Final Note

This environment rewards engineers who are:

• Thoughtful

• Cautious

• Accountable

• Comfortable with ambiguity

It is not about being the loudest or fastest,

It’s about building systems that don’t break when it matters most .