Senior Web Platform Architect – Next.js & Growth Tech

Fin; Greater London; Hybrid; GBP 120,000 - 180,000; Full time

Benefits offered by this job

Competitive salary and equity in afast

Lunch every weekday and a stocked k it

Regular compensation reviews

Pension scheme & match up to 4%

Health and dental insurance for you &/

Flexible paid time off

Maternity & paternity leave

Cycle-to-Work Scheme

MacBooks (or Windows where needed)

Job summary

Fin in London is seeking a Principal Engineer to shape the technical direction and architectural evolution of our web platform. You will lead cross-functional teams across marketing, analytics, design, data science, and engineering to ensure a scalable, measurable, and delightful web stack.

You will mentor engineers, define long-term strategy, and contribute hands-on to the codebase while ensuring reliability, observability, and high-quality shipping in a hybrid work environment.

Qualifications

• 12+ years of software engineering experience.
• Experience in a high-scale growth-focused web environment.
• Proven leadership across multiple teams or departments.
• Deep expertise in Next.js and the React ecosystem.
• Experience with headless CMS such as Contentful or Sanity.
• Experience with infrastructure-as-code (Terraform), cloud platforms (AWS, CloudFront, S3), and deployment platforms (Vercel).
• Experience designing or operating experimentation infrastructure (A/B testing, event tracking, attribution) and analytics instrumentation.

Responsibilities

• Own and evolve the architecture of Fin's web platform.
• Define the long-term technical strategy for the web team, focusing on scalability, performance, developer productivity, observability, and reliability.
• Collaborate with marketing, design, analytics, and data science to support goals with accuracy and agility.
• Lead and influence the design and implementation of MarTech systems for event tracking, attribution, and A/B testing.
• Mentor engineers across the team and organization on architecture, data modeling, and engineering best practices.
• Provide technical leadership to Engineering Managers, Product Managers, and executives, communicating risks and opportunities clearly.
• Contribute hands-on to the codebase and help unblock key projects.

Skills

Next.js

React ecosystem

Technical leadership

Cross-functional collaboration

Web performance

Headless CMS

Terraform

AWS

Vercel

Experimentation infra

Analytics & instrumentation

Full-stack awareness

Tools

Contentful

Sanity

Terraform

AWS

Vercel

Job description

Fin in London is seeking a Principal Engineer to shape the technical direction and architectural evolution of our web platform. You will lead cross-functional teams across marketing, analytics, design, data science, and engineering to ensure a scalable, measurable, and delightful web stack.

You will mentor engineers, define long-term strategy, and contribute hands-on to the codebase while ensuring reliability, observability, and high-quality shipping in a hybrid work environment.