Senior Full Stack Engineer - React/TS/Node - £80-100K

Oliver Bernard; Greater London; Hybrid; GBP 80,000 - 100,000; Full time

Job summary

Oliver Bernard in London is seeking a Senior Full Stack Engineer with React/TypeScript and AWS experience to help scale an AI-native fintech platform. You will own APIs, data models, and UI while collaborating with product and design teams to create tools that make investing smarter, more transparent and sustainable.

The role requires 5+ years building production web apps, familiarity with Next.js and GraphQL, and startup experience.

Qualifications

• 5+ years building production web apps.
• Strong experience with React, TypeScript, and Node.js.
• Familiarity with Next.js and GraphQL.
• Previous startup experience.
• A passion for clean code and intuitive product design.
• Interest in fintechs.

Responsibilities

• Own the full stack—from APIs and data models to high-performing UIs.
• Collaborate with product and design to build smarter investing tools.

Skills

5+ years exp

React

TypeScript

Node.js

Next.js

GraphQL

Startup experience

Clean code

Product design

Tools

Postgres

Prisma

GraphQL

Next.js

Job description

Senior Full Stack Engineer – React/TypeScript/AWS – £80–100k

We are partnering with a well-funded startup that is building an innovative platform empowering private investors to manage their portfolios.

As an AI-native platform on an exciting growth journey, they are seeking Full Stack Engineers to help shape their architecture as they scale.

The Role

You’ll take ownership across the full stack - from designing APIs and data models to crafting seamless, high-performing user interfaces. Working closely with product and design teams, you’ll help bring to life tools that make investing smarter, more transparent, and more sustainable.

What you’ll bring

• 5+ years of experience building production web applications
• Solid experience with React, TypeScript, and Node.js
• Familiarity with Next.js and GraphQL
• Previous startup experience
• A passion for clean code and intuitive product design
• Interest in fintech's

Nice to Haves

• Comfortable working with tools like Postgres, Prisma, GraphQL, or Next.js
• Hands-on experience with AI or agent frameworks (such as LangChain or LangGraph)
• Experience building something from scratch — whether a side project, startup, or open-source app
• Frontend: React, TypeScript, Next.js

Why Join?

• Opportunity to contribute to a mission-driven product at the intersection of finance and sustainability
• Work within a collaborative, high-performing team where individual input is valued
• Play a key role in an early-stage company where contributions directly influence success
• Competitive salary (£80–100k)
• Hybrid working model - 3 days per week in the London office

Senior Full Stack Engineer role - 3 days/week in London - £80-90k