Senior Full-Stack Engineer — TS, Node, NestJS

Avallo; Greater London; On-site; GBP 90,000 - 120,000; Full time

Job summary

Avallo is hiring a Senior Software Engineer in Greater London to lead implementation across a modern, shared stack. This hands-on role requires owning technical decisions, writing production code, and delivering scalable systems across multiple PE portfolio products.

You will design APIs and backend services, build web apps and dashboards, and integrate Stripe/Auth0 while maintaining high engineering standards in a fast-moving environment.

Qualifications

• 5+ years of professional software engineering experience with a focus on TypeScript and full-stack web development.
• Strong command of Node.js, NestJS, and Prisma — you've built and shipped production APIs.
• Solid experience with React and Next.js — you're comfortable with both the frontend and the framework.
• Familiarity with monorepo tooling; pnpm and Turborepo experience is a strong advantage.
• Experience integrating authentication systems such as Auth0 or similar.
• Comfortable working with PostgreSQL and Redis in production environments.
• A track record of writing maintainable, well-tested code and holding a high quality bar under real delivery pressure.
• Strong communication skills — you can articulate technical decisions clearly to both engineers and non-engineers.
• Able to operate independently, manage your own priorities, and take end-to-end ownership of features.

Responsibilities

• Design and build RESTful and GraphQL APIs using NestJS and Prisma on PostgreSQL.
• Develop modern web applications and internal dashboards in Next.js, React, and Vite with Tailwind CSS and shadcn/ui.
• Integrate third-party systems including Stripe, Auth0, and other client-specific tools.
• Write clean, well-tested TypeScript across frontend and backend codebases.
• Establish and improve engineering standards, patterns, and documentation across multiple product environments.
• Participate in architectural decisions and technical design reviews.
• Work directly with internal teammates and client stakeholders to translate business requirements into robust technical solutions.
• Identify and address performance, reliability, and scalability concerns proactively.
• Contribute to observability and monitoring practices using Sentry and OpenTelemetry.
• Mentor and support other engineers on the team.

Skills

TypeScript

Full-stack development

Node.js

NestJS

Prisma

PostgreSQL

Redis

React

Next.js

GraphQL

REST APIs

Monorepo tooling

pnpm

Turborepo

Auth0

Stripe

Sentry

OpenTelemetry

Tools

pnpm

Turborepo

NestJS tooling

Next.js tooling

Job description

Avallo is hiring a Senior Software Engineer in Greater London to lead implementation across a modern, shared stack. This hands-on role requires owning technical decisions, writing production code, and delivering scalable systems across multiple PE portfolio products.

You will design APIs and backend services, build web apps and dashboards, and integrate Stripe/Auth0 while maintaining high engineering standards in a fast-moving environment.