Senior Software Engineer / Development Team Lead (.NET) in London

About the Business

Quilter plc is a leading wealth management business, helping to enable brighter financial futures for every generation. Quilter oversees £141.9 billion in customer investments (as of 31 March 2026). It has an adviser and customer offering spanning financial advice, investment platforms, multi-asset investment solutions, and discretionary fund management. The business is comprised of two segments: Affluent and High Net Worth.

Affluent encompasses the financial planning business, Quilter Financial Planning, the Quilter Investment Platform and Quilter Investors, the multi-asset investment solutions business. High Net Worth includes the discretionary fund management business, Quilter Cheviot, together with Quilter Cheviot Financial Planning - offering a highly personalised service to private clients, charities, trustees, and professional partners. Quilter Cheviot has presence throughout the UK, Ireland and Channel Islands.

At Quilter we never stand still. Our foundations are rooted in our extraordinary expertise, which is trusted by hundreds of thousands of customers, but we have great ambitions to stay one step ahead and make an even greater difference to the people and communities we serve, including our colleagues. Our business is transforming, continually modernising, and becoming even more customer centric. So, if you want to be bold in the pursuit of your ambitions, bring new ideas, and challenge and evolve what we do, it's the perfect time to join us!

About the Role

Level: 4

Department: Software Engineering

Location: Southampton

Contract type: Permanent

At Quilter, technology plays a critical role in enabling business transformation, improving customer outcomes, and modernising our digital estate. We are continually evolving our platforms, practices, and capabilities to deliver secure, resilient, and customer centric digital solutions.

You are a hands-on engineer who takes ownership of the development and delivery for a product or service area, acting as a role model for engineering excellence, and providing leadership and guidance to other engineers and software developers. The role also has a focus on technical leadership, delivery ownership, and promoting and raising standards within the team.

You collaborate with Product Owners, Architects, QA, and Platform teams to design and deliver high-quality, secure, and scalable solutions aligned to Quilter's technology strategy. This role is well suited to an experienced senior developer who wants to influence outcomes, mentor others, and lead by example while remaining close to the code.

Technical Leadership & Delivery

• Take ownership of the design, development, and delivery of high-quality .NET solutions across the full software development lifecycle.
• Lead technical decision making within the team, ensuring alignment with Quilter standards and architectural direction in close collaboration with the Quilter Architecture team.
• Design and build scalable, resilient, and secure RESTful APIs and backend services.
• Write clean, testable, and maintainable code, setting the quality bar for the team.
• Perform detailed code reviews and support complex problem solving.

Team-Level Leadership & Mentoring

• Act as a senior technical role model, supporting and mentoring less experienced developers.
• Provide day-to-day technical guidance and leadership within the development team.
• Encourage strong engineering practices, collaboration, and continuous improvement.
• Support onboarding of new engineers and knowledge sharing within the team.

Ways of Working & Quality

• Champion clean code, automated testing, and CI/CD good practices.
• Embed modern DevSecOps practices, including pipeline automation and quality gates.
• Ensure solutions meet security, resilience, and regulatory expectations appropriate to a financial services environment.
• Contribute to improving development standards, patterns, and tooling across the engineering community.
• Leverage AI to drive productivity and quality improvements in both your own work and in the work of the team.

Stakeholder Collaboration

• Work in partnership with Product Owners to help shape and refine technical solutions that support business outcomes.
• Collaborate with Architects to ensure solutions align with target architecture and longer-term strategy.
• Communicate technical concepts clearly to both technical and non-technical stakeholders.

About You

You are a highly capable senior engineer with strong technical depth and the confidence to lead at a team level through influence and expertise.

Essential Experience & Skills

• Significant experience developing enterprise-grade solutions using C# / .NET / .NET Core.
• Strong experience designing and delivering RESTful APIs and distributed backend services.
• Experience building and supporting Azure-hosted workloads.
• Proven use of CI/CD pipelines (e.g. Azure DevOps) and automated testing techniques.
• Strong understanding of software design principles, patterns, and testability.
• Experience integrating backend services with React, Next.js, or Ionic front-end applications.
• Experience working in Agile / Scrum delivery environments.
• Experience working with AI tools, (e.g. GitHub co-pilot, Cowork, etc).

Leadership & Behaviours

• Demonstrate leadership through technical expertise, collaboration, and proactive ownership.
• Comfortable mentoring others while remaining accountable for personal delivery.
• Able to influence technical decisions constructively without formal authority.
• Pragmatic and outcome-focused, with a balanced approach to quality and delivery.
• Actively seeks opportunities to improve systems, processes, and ways of working.

Inclusion & Diversity

We value diversity and strive to promote inclusivity in all aspects of our culture. We believe in equal opportunities for all, ensuring that no applicant encounters less favourable treatment based on anything but their skills, qualifications, experience, and potential. We celebrate the unique contributions of a diverse workforce and create a respectful, nurturing environment where every colleague can thrive.

Values

• Do the right thing: We act with integrity and are proudly committed to going above and beyond in service of our clients and the support we provide our communities.
• Always curious: We continuously seek new ideas and knowledge so we're one step ahead of our clients' needs. We look for inspiration everywhere and encourage experimentation, recognising that this is how we create brilliant solutions for brighter futures.
• Embrace challenge: We aim high to transform our potential into meaningful outcomes. With ambition as our driving force and a steadfast commitment to growth, we succeed for the good of every generation.
• Stronger together: Combining our diverse talents, we accomplish more collectively than we ever could do alone. We speak openly, actively listen, and support each other, and constructively challenge and embrace new ideas. We seek empowerment and demonstrate ownership and trust, with the confidence to make impactful decisions.

Core Benefits

• Holiday: 182 hours (26 days)
• Quilter Incentive Scheme: All employees are eligible to participate in incentive scheme, to incentivise business performance and their contribution.
• Pension Scheme: A non-contributory company pension scheme that can be boosted through personal contributions.
• Private Medical Insurance: Single cover as standard with options to increase cover to include your partner or children.
• Life Assurance: 4x your salary.
• Income Protection: 75% of salary, less state benefits, payable after 26 weeks of absence.
• Healthcare Cash Plan: Jersey employees only.
• In addition to our core benefits, we offer a range of flexible benefits to UK employees that you can choose from and pay for conveniently via a salary deduction.