Senior Frontend Developer

Overview

🚀 Senior Front-End Engineer – Investment Banking |£750 p/d (Outside IR35) | London / Hybrid (1 Day/Week in Office) We are partnering with a global investment bank to hire a Senior Front-End Engineer to join a flagship team delivering a next-generation, single-page application (SPA) platform for high-performance derivatives trading. This is a high-profile role on a mission-critical, front-office system with exceptional technical standards. You’ll work at the cutting edge of financial technology, contributing to a modern, reactive web platform used across trading desks. This is not your typical enterprise UI, it’s fast, data-intensive, and built to scale with real-time demands in a trading environment. 💼 The Opportunity Collaborate with elite engineers on a SPA used across the investment bank for derivatives trading. Build elegant, high-performance UIs with real-time data updates and functional programming paradigms. Shape a front-end architecture trusted by traders, with a focus on resilience, performance, and usability. Leverage the latest web technologies in a fast-paced, agile development environment. Flexible working arrangements with only 1 day per week required in the City of London office. ✅ Key Requirements Strong commercial experience with TypeScript, ES6, HTML5, and advanced CSS. Proven delivery of performance-critical SPAs, ideally within front-office trading or other high-frequency environments. Proficiency with functional and reactive programming using immutable data structures. Attention to UI/UX detail – you take pride in building intuitive, beautiful products. Comfortable working in collaborative, high-performance teams. Confident daily use of LLMs and agent-mode AI tools to accelerate development and enhance workflow. 🌟 Nice to Have RxJS experience (a big plus). Familiarity with Angular + NgRx or React + Redux. Full stack experience using a typed backend language like Java, C#, or F#. 📅 Details Day rate: £750 per day Outside IR35 Location: London (Hybrid – 1 day/week in the office, rest flexible) Interview Process: Starts 12th November 2025 Start Date: 5th January 2026 Please note CV's will not be reviewed until WC 3rd November 🚀 Why Join? This is your chance to work on a flagship trading platform that’s setting the benchmark for web technology in investment banking. You’ll be part of a technically outstanding team, solving complex problems and delivering software that matters — with genuine flexibility and a balanced work-life setup.

Responsibilities

• Collaborate with engineers to design and implement high-performance SPAs.
• Develop and maintain elegant UIs with real-time data updates.
• Shape the front-end architecture to ensure resilience and performance.
• Utilize modern web technologies in an agile development setting.
• Participate in team discussions to improve development workflows using AI tools.

Requirements

• Strong commercial experience with TypeScript, ES6, HTML5, and advanced CSS.
• Proven track record of delivering performance-critical SPAs, particularly in front-office trading environments.
• Proficient in functional and reactive programming with immutable data structures.
• Strong focus on UI/UX detail and user-friendly product design.
• Able to work effectively in high-performance, collaborative teams.
• Familiarity with LLMs and agent-mode AI tools for development enhancement.
• Experience in RxJS and knowledge of frameworks such as Angular + NgRx or React + Redux is a plus.
• Full stack experience with a typed backend language like Java, C#, or F# is advantageous.