Lead Software Engineer, Team Lead

Marsh; Greater London; Hybrid; GBP 95,000 - 130,000; Full time

Job summary

Mercer, a Marsh business, is looking for a hands-on Tech Lead to guide a UK-based team in London, with a dotted-line to an India engineering pod. You will own technical direction, delivery, and day-to-day engineering leadership while partnering with risk advisory stakeholders.

This hybrid role requires mentoring, code reviews, and active participation in sprint planning, CI/CD, and production readiness, with opportunities to drive GenAI/agentic capabilities and governance.

Qualifications

• Experience leading a team and hands-on coding delivery.

Responsibilities

• Lead end-to-end delivery of CAT products, aligning with stakeholders.
• Own backend and integration approach (APIs, data flows, security, RBAC).
• Provide technical leadership for distributed London + India team.

Skills

Team leadership

Backend engineering

API design

Python

FastAPI

Next.js/React

GenAI/AI governance

Stakeholder communication

CI/CD

Security RBAC

Tools

SQL databases

MongoDB

Document storage

Job description

We are seeking a talented individual to join our Client Analytics & Technology (CAT) team at Mercer, a Marsh business. This role will be based in London. This is a hybrid role that has a requirement of working at least two days a week in the office.

The CAT team builds and runs internal and client-facing analytics and technology products across Mercer businesses. You will be the hands‑on Tech Lead for a small UK-based team working closely with an India engineering pod, owning technical direction, delivery, and day‑to‑day engineering leadership. The role requires strong domain partnership (risk advisory / consulting stakeholders) alongside pragmatic software engineering and architecture judgment.

We will count on you to:

• Lead end-to-end delivery of CAT products (e.g., Concierge an agentic AI workflow tool, Prism a Mercer knowledge fabric for scheme data, and similar initiatives), from problem framing and design through build, release, and support.
• Translate risk advisory / consulting needs into clear technical requirements, user stories, and solution designs; partner with stakeholders through UAT and rollout.
• Own the backend and integration approach (APIs, data flows, security, RBAC), and ensure solutions are scalable, maintainable, and well documented
• Provide technical leadership for a distributed team (London + India): sprint planning input, code reviews, mentoring, and raising engineering standards.
• Drive quality and operational readiness: testing strategy, CI/CD, release notes, production deployment governance, and incident/root-cause management.
• Identify and deliver pragmatic AI/ML opportunities where valuable (e.g., agentic workflows, RAG/LLM-enabled capabilities) with appropriate governance and human-in-the-loop controls.

What you need to have:

• Experience managing a team, as this role involves leading a team of 5 as well as contributing hands‑on coding work.
• Proven experience as a Tech Lead / Lead Engineer delivering production software, including hands‑on coding and code review ownership.
• Strong backend engineering skills (API design, data modelling, performance) and experience building secure, role‑based applications.
• Experience working directly with business stakeholders in a financial firm, with the ability to explain technical tradeoffs clearly.
• Demonstrated ability to lead delivery with an agile team across time zones (e.g., sprint ceremonies, prioritization support, and team coordination).

What makes you stand out:

• Prior experience in UK pensions covenant / advisory / trustee-facing tools, and strong ability to connect technical design to covenant outcomes.
• Experience with Python-based services (e.g., FastAPI) and modern web stacks (e.g., Next.js/React.js) in real‑world delivery.
• Practical experience delivering GenAI/agentic solutions (prompt engineering, RAG, governance patterns) in production or controlled enterprise environments.
• Worked with data pipelines / SQL databases / Mongo databases or Document storages.

Why join our team:

• We help you be your best through professional development opportunities, interesting work and supportive leaders.
• We foster a vibrant and inclusive culture where you can work with talented colleagues to create new solutions and have impact for colleagues, clients and communities.
• Our scale enables us to provide a range of career opportunities, as well as benefits and rewards to enhance your well‑being.

Marsh (NYSE: MRSH) is a global leader in risk, reinsurance and capital, people and investments, and management consulting, advising clients in 130 countries. With annual revenue of over $27 billion and more than 95,000 colleagues, Marsh helps build the confidence to thrive through the power of perspective. For more information, visit corporate.marsh.com, or follow us on LinkedIn and X.

Marsh is committed to embracing a diverse, inclusive and flexible work environment. We aim to attract and retain the best people and embrace diversity of age background, civil partnership status, disability, ethnic origin, family duties, gender orientation or expression, gender reassignment, marital status, nationality, parental status, personal or social status, political affiliation, race, religion and beliefs, sex/gender, sexual orientation or expression, skin color, or any other characteristic protected by applicable law. We are an equal opportunities employer. We are committed to providing reasonable adjustments in accordance with applicable law to any candidate with a disability to allow them to fully participate in the recruitment process. If you have a disability that may require reasonable adjustments, please contact us at [e-mail].

Marsh is committed to hybrid work, which includes the flexibility of working remotely and the collaboration, connections and professional development benefits of working together in the office. All Marsh colleagues are expected to be in their local office or working onsite with clients at least three days per week. Office-based teams will identify at least one “anchor day” per week on which their full team will be together in person.