Full Stack Engineer

Y TREE; Greater London; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Health & wellbeing

25 days annual leave

Pension contributions

Office environment and team socials

AI tooling support

Job summary

Y TREE in London is seeking a passionate Front-end Engineer to join our AI-first Wealth Tech squad. You will build scalable, user‑facing features with JavaScript/TypeScript and React, collaborating with a cross‑functional team to deliver compelling client experiences.

Hybrid work is required: 2 days a week in the office. We value independent thinkers who embrace modern engineering practices, API consumption (GraphQL), and the use of agentic AI tools to drive quality and velocity across the

Qualifications

• 3+ years of experience as a front-end engineer with JavaScript/TypeScript and React.
• Experience using AI-assisted or agentic development tools in daily workflows.
• Familiarity with TDD, clean architecture concepts, and consuming APIs (GraphQL).
• Independent, collaborative thinker who thrives in small teams and values feedback.

Responsibilities

• Build, test, and optimize scalable, user-facing features for our client-facing web app.
• Take ownership of domain software and contribute to our event-driven microservices when needed.
• Leverage agentic coding tools across the development lifecycle and ensure high-quality AI outputs.
• Collaborate in two-week sprints to plan, develop, and release secure features.

Skills

JavaScript/TypeScript

React

AI-assisted development

GraphQL API usage

TDD / clean architecture

Independent problem solver

AI tooling (Claude Code)

Tools

Claude Code

Job description

About Y TREE

We are a rapidly growing Wealth Tech business re-defining how individuals and families connect and engage with their money. By harnessing sophisticated portfolio analytics, innovative behavioral psychology, and cutting-edge UX/UI, we create transformational financial outcomes for our users.

Team Overview & The Role

We are looking for a passionate Engineer to join our cross-functional squad in London. While the role has a strong front-end focus, we are an AI-first engineering organization. The ideal candidate uses agentic AI tools as a force multiplier and is comfortable flexing to tackle backend tasks (Kotlin/Spring) when squad priorities shift.

Core Responsibilities

• Feature Development: Build, test, and optimize highly scalable, user-oriented features for our client-facing web application.
• Full Stack Adaptability: Take ownership of domain software, contributing to our event-driven microservices platform when backend support is needed.
• AI Engineering: Leverage agentic coding tools (e.g., Claude Code) across the full development lifecycle, reviewing and hardening AI-generated outputs to maintain rigorous quality standards.
• Agile Delivery: Collaborate in a two-week delivery window to plan, develop, and release secure, cost-efficient features.

What You Bring

• Experience: 3+ years of experience as a front-end engineer utilizing JavaScript/TypeScript and the React library.
• AI-Assisted Workflow: Daily practical experience with AI-assisted or agentic development tools, with the engineering judgment needed to audit and refine AI outputs.
• Modern Engineering Practices: Familiarity with TDD principles, clean architecture concepts, and consuming APIs (e.g., GraphQL).
• Mindset: An independent, critical thinker who thrives in collaborative, small-team environments and values continuous feedback.

Bonus Points

• Backend development experience in Java or Kotlin (ideally Spring Boot).
• Understanding of microservices, database concepts (RDBMS/PostgreSQL), and event-driven architectures (Kafka).
• Familiarity with containerization (Docker) or cloud deployments (AWS/Kubernetes).

Location & Ways of Working

• Hybrid Model: London-based with a hybrid policy requiring 2 days per week in our London office.

What We Offer (Benefits)

• Health & Wellbeing: Private healthcare through Vitality (including 50% off premium gym memberships) and an Employee Assistance Programme.
• True Time Off: 25 days of annual leave where we expect you to fully unplug—no booking leave required for quick life appointments.
• Financial Future: 3% standard employer pension contribution, with enhanced company matches available via salary sacrifice.
• Environment: A welcoming, dog-friendly office with break-out spaces and silent booths, alongside regular, well-balanced team socials.
• Extra Perks: Electric car schemes, family-friendly policies, and support towards professional qualifications.