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Twelve

Software Engineer

On site

London, United kingdom

£ 80,000 /year

Junior

Full Time

31-12-2025

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Skills

Java Go Rust TypeScript Architecture Systems Architecture Databases react node.js

Job Specifications

The Opportunity

As an early engineering hire, you will be responsible for designing and building the core architecture of the platform. This role requires a balance of backend systems design and fullstack implementation to ensure features are delivered reliably at scale.

Key Responsibilities:

Systems Architecture: Design and implement fault-tolerant, event-driven services using queues, message brokers, and databases.
Full Stack Development: Contribute to a React-Native codebase to facilitate end-to-end feature implementation.
Technical Excellence: Write secure, high-quality code in TypeScript (Node.js) while maintaining 99.9% system uptime.
Security & Compliance: Implement data protection measures that meet payment industry standards, such as PCI DSS and PSD2.
Roadmap Strategy: Evaluate technical trade-offs and advocate for architectural improvements that enhance development speed.

About You

Experience: A minimum of 3 years of professional experience as a software engineer.

Technical Proficiency: Strong foundations in distributed systems, including event-based patterns and message brokers.

Modern Stack: Proficiency in TypeScript and Node.js is required. Experience with statically compiled languages (Go, Rust, or Java) is a significant advantage.

Mindset: A pragmatic approach to security and compliance, with the ability to deliver high-quality code in a fast-paced environment.

Working Environment

Location: Based in Hoxton, London.

Format: The team maintains an in-person culture with four office days per week. Wednesdays are optional for remote work to provide flexibility for focused tasks.

Compensation: £60,000 - £80,000 gross annually, depending on experience and qualifications.

About the Company

Tech hiring has been the same for decades. Overpriced. Slow. Inefficient...what if it wasn't? Our founders have combined 30 years expertise across exec search, internal rec and agency. They've led talent strategy for companies like Trainline, Moonpay and Checkout, and recruited for 100's of tech brands like McKinsey, Just Eat, and Monzo. Salaries in the technology sector have risen faster than inflation for years, meaning recruitment fees have enjoyed the same trend. In a market where tech talent is more accessible than ever... Know more