Lead software developer (full stack web) Work, Jobs in London, Eng (with Salaries)

Full Stack Software Developer
Mercer —London
- Full-time
- JavaScript
- APIs
- AI
12h
Full Stack Angular Developer
Affinity Water —Hatfield
- £65,000 a year
- Hybrid work
- AWS
- Mentoring
- APIs
- Annual leave
- Employee discount
7d
Software Engineer III, Full Stack, Android Performance Console
Google —London
- Doctoral degree
- Computer Science
- Java
4d
Lead Software Engineer - Python / Athena Trade and Risk Services
JPMorganChase —London
- Full-time
- SQL
- Software development
- AI
3d
Software Engineer, TPU Compiler, PhD, Early Careers
Google —London
- Doctoral degree
- C++
- Machine learning
Lead Cloud Platform Engineer- i.AI
Department for Science, Innovation & Technology —London
- £12,643 a year
- Part-time
- Hybrid work
- Azure
- System design
- AWS
- Annual leave
- Employee discount
Front Office Developer Platform Lead
Barclays —London
- AWS
- JavaScript
- Communication skills
Senior Backend Engineer
9fin —London
- Full-time
- Hybrid work
- SQL
- AWS
- APIs
- Sick pay
Field Marketing Manager, Startups (EMEA)
Vercel —London
- £90,000 - £113,000 a year
- Full-time
- Sales
- Analysis skills
- Project management
- Work from home
Principal Engineer, Web Platform – Team Web
Intercom —London
- Hybrid work
- AWS
- JavaScript
- In-person
- Annual leave
- Work from home
Solution Architect (Remote - Work from Anywhere)
Xapo Bank —London
- Full-time
- Remote
- AWS
- Communication skills
- Banking
- Annual leave
Quick apply
Forward Deployed Engineer
HackerRank Careers —London
- Sales
- APIs
- Python
Quick apply
Infrastructure Security Engineer
Blockchain.com —London
- Full-time
- Remote
- Master's degree
- AWS
- Analysis skills
Quick apply
Lead JavaScript Engineer - Encore Musicians
Mixcloud —London
- Full-time
- Hybrid work
- Computer Science
- Engineering
- AWS
Quick apply
7d
Senior Data Engineer
Allwyn Lottery Solutions —London
- Full-time
- Hybrid work
- ERP systems
- SQL
- AWS
- Employee assistance programme
- Life insurance
Quick apply
4d

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Full Stack Angular Developer
Affinity Water —Hatfield
Troubleshoot and resolve technical issues while driving continuous improvement across development, testing and deployment processes.
£65,000 a year
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Our mission is to develop the tools and technology that enable our teams to get our customers back to normal. Develop new products and features end to end using…
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Full Stack Software Developer

Mercer -
London

Apply Now

Job details

Full-time
12 hours ago

Qualifications

Pension
Law
React
Kubernetes
Software deployment
NoSQL
MongoDB
Docker
JavaScript
Back-end development
Data pipeline
APIs
AI
TypeScript
Python

Full job description

Company:

Mercer

Description:

We are looking for a talented and energetic individual to join the AI Product team in DC Pensions at Mercer UK. This is a UK-based role with flexible working — we are open to hybrid or office-based arrangements for the right person.

The AI Product team is a small, UK-based, forward-deployed AI, tech and development team responsible for the Pensions AI Assistant — a customer-facing AI Agent. We are nimble, innovative and move quickly, using the latest technologies available to us within the group. Our tech stack includes Python and React / Next.js, makes extensive use of LLMs via API, and is deployed on OSS2 Kubernetes within Marsh Tech. Being forward-deployed means we build our products inside the business itself, so you will develop genuine domain knowledge in pensions as part of the role.

Your role is to lead on the engineering development and maintenance of the AI technology we build, spanning the backend (Python), front-end (React and Next.js) and deployment (OSS2 / Kubernetes). You will also get into the AI Agent plumbing and agent resilience. AI Agent quality and trust are vital for Mercer: because our product is customer-facing, building and maintaining reliable, trustworthy systems is central to what we do. You will work alongside the lead Data Science / AI engineer and report to the Head of AI Product — both of whom are hands-on developers, so this is very much a team effort. There are no direct reports; we are looking for a self-starter who thrives as part of a small, collaborative team.

We will count on you to:

Lead full-stack development and maintenance of the AI Assistant tech stack across the backend (Python), front end (React/Next.js), and deployment (OSS2/Kubernetes).
Take responsibility for design, coding, testing, and software quality across the application life cycle, ensuring user needs, performance requirements, and security standards are met.
Improve AI agent reliability, trust, and safety, helping ensure the Assistant is dependable for customers.
Participate in technical design and peer review, review code, and contribute to strong engineering practices across the team.
Create and maintain documentation as part of solution delivery, and serve as a point of contact with the wider IT and Marsh Tech teams as needed.
Diagnose issues, resolve problems, and recommend improvements and enhancements to the product.
Alongside the core developer role, spend a portion of your time supporting AI change across the DC organization on small, ad hoc projects — helping the business use and deploy AI for process efficiencies and better client outcomes. This is flexible work that will evolve over time.

What you need to have:

Proven experience as a senior full-stack developer delivering production software, able to work independently and take ownership end to end.
Strong backend engineering skills in Python (services and API design).
Solid front-end experience with React and TypeScript.
Hands-on experience deploying and running applications on Kubernetes.
A track record of building and maintaining reliable, high-quality software, with a genuine interest in the quality, trust and resilience of customer-facing systems.
The ability to collaborate closely within a small, hands-on team while also being a self-starter who can drive work forward independently.

What makes you stand out?

Experience building AI / LLM-enabled products in production or controlled enterprise environments (e.g. agentic workflows, RAG, prompt engineering, evaluation and governance patterns)
Experience with React / Next.js and modern web tooling.
Familiarity with document / NoSQL stores (e.g. MongoDB) and data pipelines.
Experience with deployment, Docker, logging and configuration.
Understanding of the internal Marsh Tech landscape — OSS2, networking, the Voyager process, and similar — is an advantage.
Interest in, or experience with, the UK pensions domain; relevant domain knowledge will be developed in the role.

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.

Mercer is a business of Marsh (NYSE: MRSH), 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 about Mercer, visit mercer.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 [email protected].

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.

Apply Now

Refine Your Search

lead software developer (full stack web) jobs in london, eng

Full Stack Software Developer

Full Stack Angular Developer

Software Engineer III, Full Stack, Android Performance Console

Lead Software Engineer - Python / Athena Trade and Risk Services

Software Engineer, TPU Compiler, PhD, Early Careers

Lead Cloud Platform Engineer- i.AI

Front Office Developer Platform Lead

Senior Backend Engineer

Field Marketing Manager, Startups (EMEA)

Principal Engineer, Web Platform – Team Web

Solution Architect (Remote - Work from Anywhere)

Forward Deployed Engineer

Infrastructure Security Engineer

Lead JavaScript Engineer - Encore Musicians

Senior Data Engineer

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