Senior Web App Engineer - Full-Stack (Python/React) - London

Insight Global; Greater London; On-site; GBP 80,000 - 110,000; Full time

Job summary

Insight Global is seeking a Senior Web Application Developer for a leading global financial markets and trading infrastructure organisation in London. You will design, develop, test, deploy and maintain high-availability web applications across the full stack, delivering data-driven solutions that support trading services worldwide.

The role involves mentoring engineers, collaborating with stakeholders, and driving best practices in development, testing and automation.

Qualifications

• Strong experience developing high-performance, data-driven web applications.
• Experience with Python and React development.
• Experience with Django or other MVC web frameworks.
• Experience building full-stack web solutions including frontend, backend APIs, and database integration.
• Strong knowledge of HTML5 and CSS3.
• Experience with Linux/Unix-based systems.
• Experience with SQL databases, particularly PostgreSQL.
• Experience implementing automated testing (unit and full-stack).
• Ability to participate in code reviews and documentation.
• Strong communication across technical and business teams.

Responsibilities

• Design, develop, enhance, and maintain web-based software platforms.
• Build end-to-end solutions covering frontend interfaces, backend services, APIs, and database functionality.
• Create and maintain technical documentation and customer-facing materials.
• Implement robust automated testing and support QA initiatives.
• Participate in sprint planning, requirements gathering, and peer code reviews.
• Support production deployments and troubleshoot issues as required.
• Collaborate with cross-functional stakeholders to deliver technical solutions on schedule.
• Mentor team members and contribute to engineering best practices.
• Support business-critical systems and participate in occasional out-of-hours testing and operational activities.

Skills

Python

React

Django

MVC frameworks

Full-stack development

HTML5

CSS3

Linux/Unix

PostgreSQL

Automated testing

Code reviews

Documentation

Requirements gathering

Team collaboration

Job description

Insight Global is seeking a Senior Web Application Developer for a leading global financial markets and trading infrastructure organisation in London. You will design, develop, test, deploy and maintain high-availability web applications across the full stack, delivering data-driven solutions that support trading services worldwide.

The role involves mentoring engineers, collaborating with stakeholders, and driving best practices in development, testing and automation.