Senior Full Stack Engineer

Vitesse Psp; City of Westminster; Hybrid; GBP 100,000 - 125,000; Full time

Job summary

A financial technology company is seeking a Senior Fullstack Software Engineer to lead product development with an emphasis on customer value. The ideal candidate will excel in a collaborative environment, overseeing the full product lifecycle from design to deployment while focusing on quality and maintainability. Proficiency in .Net Core, React, and a solid understanding of microservices in an Agile setting are essential. This role offers a hybrid work model, emphasizing outcomes and innovation within a supportive team.

Benefits

Volunteering leave

Recruitment referral fees

Medical Insurance

Learning & development opportunities

Commuter Benefits

Sick Leave

Qualifications

• 3+ years experience with .Net Core. .Net Framework experience ideal.
• Experience with microservice architecture and asynchronous communication.
• Proficient in Agile methods and collaborative practices.

Responsibilities

• Design and develop enterprise-level products.
• Prepare prototypes and assess technical feasibility.
• Support software operational excellence and resolve customer pain points.

Skills

.Net Core proficiency

React

Typescript

Agile methodologies

Communication skills

Job description

We're looking for a Senior Fullstack Software Engineer with a strong product engineering mindset - someone who thrives at the intersection of technology, customer needs, and business outcomes. This isn't a pure coding role. You'll be deeply embedded in the product development lifecycle: helping to shape what we build, why we build it, and how it delivers value. You'll collaborate closely with product owners, designers, and other engineers to drive decisions, ship iteratively, and own features end-to-end. From architecture to production monitoring. We value engineers who care about outcomes over output, take ownership and challenge assumptions, and treat product quality, observability, and maintainability as first‑class concerns.

Responsibilities

• Design, develop, deploy and support world‑class, enterprise‑level products.
• Understand and follow the flow from storyboarding, wireframing, prototyping to completed UI/backend.
• Prepare low fidelity prototypes for internal review and brainstorming.
• Capable of gauging technical feasibility of the prototype.
• Present high‑fidelity designs/mock‑ups for review/iteration/approval.
• Participate in software operational excellence efforts by identifying and troubleshooting customer pain points.
• Create high quality technical documentation supported by example code where necessary.
• Able to communicate effectively with their team and communicate the implementation of solutions clearly.
• Able to write narrative documentation on home team architecture.
• Knows when to use appropriate design patterns.
• Writes idiomatic code in‑home team tech stack.
• Designs new schemas comprising multiple tables.
• Implements complex asynchronous messaging flows, and complex RPC handlers.
• Implements distributed systems with multiple interacting services.
• Coordinates complex deployments and database migrations.
• Handles complex error cases in‑home team codebases.
• Debugs production issues.
• Proactively consider the scalability, observability, and security implications of their work.
• Can deliver large well‑defined tasks and smaller scope not‑well‑defined problems.
• Owns the implementation of part of home team architecture.
• Contributes to scaling engineering hiring (eg. onsite interviews).
• Onboards and mentors new engineers (i.e. by finding learning opportunities for others).
• Contributes to writing proposals co‑authored with TL/PE.
• Breaks down large problems into small steps across multiple PRs.
• Proactively provide daily updates to the team and seeks feedback from the people around them.
• Assist the team in taking on the role of OCE (On‑call Engineer) for 24/7 support.
• Builds and improves tools for the benefit of all engineers.
• Help solve customer issues.
• Able to contribute to RCAs.

Why You'll Love Working Here

• Unstoppable Growth: We're doubling down on innovation, and you'll help shape our future.
• Amazing People: Work with talented, passionate, and friendly folks who support each other.
• Real Impact: See the results of your work in the real world, every single day.

Qualifications

• Strong proficiency with .Net Core, +3 years (.Net Framework experience ideal).
• Extensive front experience with React and ideally Typescript.
• Professional experience in a distributed microservice architecture using asynchronous event‑driven communications, DDD, and automated CI/CD pipelines.
• Fluent with Agile methods and collaborative working practices.
• Good understanding of SOLID principles, service‑oriented architecture, and a particular appreciation for security best practices in software development.
• Confident in both oral and written communication.
• Proactively updates the team and seeks feedback from stakeholders.

At Vitesse, we're more than just a payments platform - we're the trusted financial infrastructure connecting the global insurance ecosystem. Tailor‑made for insurers, brokers, MGAs, and TPAs, our unified platform optimises claims funds, enables real‑time global payments, and delivers full financial control. Our impact is real: over $20 billion in payments across 200+ countries, hundreds of millions returned to insurers' balance sheets, and counting. We're licensed in the UK (FCA), Europe (DNB), and New York (NYDFS), with over 260 amazing colleagues worldwide. With $93 million recently raised in Series C funding from KKR, our journey is just beginning, and our ambitions are sky‑high.

What We Offer

• 2 days of volunteering leave
• Recruitment referral fees of $1,000
• Medical Insurance
• Basic life & AD&D insurance
• Access to our mental health therapy partner Oliva wellbeing platform.
• Sick Leave - 5 days
• Annual leave - 20 days
• Maternity leave
• Paternity leave
• Voluntary Critical Illness and accident Insurance (employee paid)
• Employee Assistance Program
• Ongoing learning & development
• Commuter Benefits

We understand that everyone has their own work rhythm and we believe in a flexible working schedule that supports a healthy work/life balance. We offer a hybrid work approach with 3 days in the office.

Values

• Confident Humility – We believe the best ideas come from listening and learning. We leave ego at the door, ask for help when we need it, and celebrate collective success. When one of us wins, we all do.
• Driven to Succeed – We're ambitious about the opportunity ahead and committed to achieving it together. We hold ourselves to high standards, take pride in what we deliver, and push for meaningful outcomes for our customers, our partners, and each other.
• Tenacious Responsibility – We take ownership of our work, our decisions, and our results. We face challenges with resilience, learn from setbacks, and see things through to completion. Because doing the right thing matters.