Find a job 
Featured Companies 
Featured Universities 
For Companies At a Glance
- Tasks: Design and build robust web and mobile applications using Scala and React.
- Company: Join FlexTrade, a leader in innovative trading solutions for financial institutions.
- Benefits: Competitive salary, flexible work environment, and opportunities for professional growth.
- Why this job: Make an impact by developing cutting-edge technology in a collaborative team.
- Qualifications: Experience in React, Scala, and building production web apps is essential.
- Other info: Dynamic team culture with mentorship and career development opportunities.
The predicted salary is between 36000 - 60000 £ per year.
FlexTrade Systems is a provider of customized multi-asset execution and order management trading solutions for buy- and sell-side financial institutions. Through deep client partnerships with some of the world's largest, most complex and demanding capital markets firms, we develop the flexible tools, technology and innovation that deliver our clients a competitive edge. Our globally distributed engineering teams focus on adaptable technology and open architecture to develop highly sophisticated trading solutions that can automate and scale with your business strategies.
At FlexTrade, we hold our values close to heart, with pride and gratitude, as they guide us in everything that we do. We are dedicated to giving our clients a competitive edge, taking ownership of our responsibilities, being flexible to adapt to ever changing environment and technology, bringing integrity to every interaction and we continue to improve, grow together and collaborate as one team. All of these while having fun truly makes FlexTrade a wonderful place to work.
The Team: We are looking for an amazing developer to join our team building FlexTrade’s OEMS platform, FlexONE, which is our state-of-the-art, fully integrated Order Management System and Execution Management System. This system was built from the ground up starting in 2013 and is written entirely in Scala. The FlexONE team is split between our Milwaukee office, where the product was first developed, and our London office, which is now predominantly responsible for development of the UI for the application. The London team is an experienced group of Java and Scala developers, with a deep understanding of UI and UX design. We deliver our software using agile methodologies, and we encourage best practices such as TDD, code reviews and pair programming for knowledge sharing and learning. Our team owns all aspects of the features they work on, from designing solutions to meet customer or product requirements, through implementation, QA and delivery. Each team member works on every part of the system.
About You: As a Senior Web Developer, be part of our FlexONE team and own critical product surfaces across our web and mobile applications. You’ll work end-to-end across a Scala + Play Framework backend, and a React + AG-Grid front-end, using gRPC for communication with our core product’s backend systems. You will lead the technical direction as we build our Web app from an MVP to a comprehensive companion to the desktop application, as well as continuing the evolution of our Mobile app.
Responsibilities:
- Design & Build: Deliver robust, maintainable features across the stack (Scala/Play backend, React/AG‑Grid frontend)
- Mobile Migration: Define the path from Codename One to a JS‑compatible framework (likely React Native), including architecture, incremental migration strategy, and performance/UX parity
- Quality & Reliability: Champion code quality, testing, observability (metrics, logs, tracing), and performance across the stack
- Team Growth: Mentor engineers, assist with hiring, onboarding, and capability development as the team scales.
- Collaboration: Partner closely with the Desktop application development team to ensure feature compatibility and parity
Tech Stack:
- Backend: Scala, Play Framework, REST/JSON and gRPC
- Frontend: React, TypeScript, AG-Grid
- Mobile: Current app in CodenameOne, target migration to React Native (or similar JS-based cross-platform framework)
- Tooling: Jenkins, GitLab, SonarQube, IntelliJ IDEA
Qualifications:
- Experience building & deploying production web apps, with significant experience in React and modern TypeScript
- Strong experience in Scala (or any JVM language including core Java)
- Experience building or maintaining cross-platform Mobile Apps
- Solid grasp of API design, web & mobile architecture, as well as good UX design
- Clear, pragmatic communicator who collaborates well with both engineers and non-engineers
Senior Software Developer (Web) in London employer: FlexTrade
Contact Detail:
FlexTrade Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Software Developer (Web) in London
✨Tip Number 1
Network like a pro! Reach out to your connections in the industry, attend meetups, and engage with online communities. You never know who might have the inside scoop on job openings or can refer you directly.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your projects, especially those that align with FlexTrade's tech stack. This gives potential employers a taste of what you can bring to the table.
✨Tip Number 3
Prepare for interviews by practising common technical questions and coding challenges. Don’t forget to brush up on Scala and React, as they’re key for the role at FlexTrade!
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen. Plus, it shows you’re genuinely interested in being part of the FlexTrade team.
We think you need these skills to ace Senior Software Developer (Web) in London
Some tips for your application 🫡
Tailor Your CV: Make sure your CV reflects the skills and experiences that align with the Senior Software Developer role. Highlight your experience with Scala, React, and any relevant projects that showcase your ability to deliver robust features.
Craft a Compelling Cover Letter: Use your cover letter to tell us why you're excited about joining FlexTrade. Share specific examples of how you've contributed to team success in previous roles and how you can bring value to our FlexONE team.
Showcase Your Technical Skills: Don’t shy away from detailing your technical expertise! Mention your experience with agile methodologies, TDD, and any tools like Jenkins or GitLab that you've used. This will help us see how you fit into our development process.
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it shows us you’re keen on being part of our team!
How to prepare for a job interview at FlexTrade
✨Know Your Tech Stack
Make sure you’re well-versed in Scala, Play Framework, React, and TypeScript. Brush up on your knowledge of gRPC and API design too. Being able to discuss your experience with these technologies confidently will show that you’re a great fit for the role.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in previous projects, especially related to web and mobile app development. Use the STAR method (Situation, Task, Action, Result) to structure your answers and highlight how you’ve contributed to successful outcomes.
✨Emphasise Collaboration
FlexTrade values teamwork, so be ready to talk about how you’ve worked with cross-functional teams in the past. Share examples of how you’ve collaborated with designers, product managers, or other developers to deliver high-quality features.
✨Ask Insightful Questions
Prepare thoughtful questions about the FlexONE platform, the team dynamics, and the company culture. This not only shows your interest in the role but also helps you gauge if it’s the right fit for you. Think about asking about their agile practices or how they approach mentoring within the team.
