Senior Frontend Engineer in London

Role: Senior Frontend Engineer

Reporting to: Director of AI and Development

Location: Remote - UK

Job Type: Full-time, Permanent

Salary: Competitive, based on experience + benefits + bonus potential

About Us

Come and be a part of The Investigo Group (TIG), a dynamic coalition of cutting‐edge tech firms specialising in Platform, Software, Data, AI and other bleeding‐edge technology solutions. Our innovative prowess spans the globe while proudly hailing from the United Kingdom.

The group is multi‐functional with a large portfolio of B2B products and services.

Our ecosystem is made up of:

• IIS, Providing secure internet access in both the public and private sectors. Its mission? To deliver world‐class secure internet capabilities enhancing productivity across diverse skillsets and organisations.
• Vestigo Consulting is our training and consultancy company, tailored around specialist sector‐specific knowledge, and provides regular courses and CPD for our community. The Consultancy side concentrates on expert support of our customers as well as specifically assigned individual deployments.
• Collaboraite is a bleeding‐edge company that provides our Data and AI capability. A collaborative partner for designing user‐centred secure data solutions to overcome operational hurdles, delivered through design thinking and agile coaching.

Diversity, Equity, and Inclusion (DEI) are at the heart of The Investigo Group (TIG). We're dedicated to creating a workplace where people from all backgrounds are not only welcome but empowered to excel. We actively seek diverse talent, promote fairness, and foster an inclusive environment where every voice matters, driving innovation and progress in our dynamic tech community.

The group provides bespoke, secure, user‐centric products fuelled by deep technical knowledge advanced data and analytical skills. We proudly stand as a global leader in this space, partnering with esteemed entities that require these advanced forward‐thinking capabilities. These partnerships have been forged from our understanding of customer challenges, as well as our expertise in developing world‐leading enterprise product sets.

Join us at TIG, where innovation knows no bounds, and together, we'll shape the future of technology solutions for a safer, more efficient world.

About You:

You are a highly skilled Senior Frontend Engineer who thrives on turning complex ideas into elegant, performant, and intuitive user experiences. You bring a deep understanding of modern frontend engineering and a passion for building clean, scalable, and maintainable interfaces particularly in data‐rich or real‐time environments.

You're comfortable operating as a senior individual contributor: someone who takes ownership, brings clarity to ambiguity, and elevates engineering standards through your work and collaboration. You enjoy partnering closely with designers, backend engineers, and machine learning specialists, and you're confident communicating technical decisions to both technical and non‐technical audiences.

You have strong experience delivering high‐quality web applications end‐to‐end, and you're excited by the opportunity to help define the tooling, frameworks, and best practices of a growing frontend function. You take pride in writing excellent code, but equally value documentation, knowledge sharing, accessibility, and thoughtful UI/UX.

You stay curious, keep up with modern frameworks and trends, and are enthusiastic about contributing to projects that involve innovation, whether that's real‐time interfaces, desktop/PWA builds, visualising complex graph structures, or integrating with AI‐driven capabilities.

Most importantly, you're motivated by impact. You want to help shape how a new engineering team works, influence the frontend direction across multiple products, and contribute to a culture of continuous improvement, collaboration, and high‐quality delivery.

About The Team:

You'll be joining a small but growing Frontend Engineering team within our wider Software Development and AI function. We're a collaborative, cross‐functional group made up of frontend engineers, backend developers, machine learning specialists, UX designers, and QA working closely together to build intelligent, data‐driven products that solve real‐world challenges.

As part of this team, you'll play a key role in shaping how we deliver modern UI experiences across multiple platforms, including web, desktop, PWAs, and browser extensions. Our work spans a range of exciting problem spaces, from real‐time messaging and complex visualisation layers to integrations with LLMs, computer vision, and advanced data pipelines.

We value engineering excellence, transparency, and continuous improvement. Everyone contributes to decision‐making, standards, and ways of working, whether that's defining our component library, improving build processes, influencing architectural choices, or helping grow the frontend discipline.

If you're looking for a team where your ideas matter, where you can make a visible impact on products and engineering culture, and where you get to collaborate with talented people across multiple domains, you'll feel right at home here.

About The Role:

As a Senior Frontend Engineer, you will play a pivotal role in designing, building, and optimising high‐quality user interfaces across our suite of data‐driven applications. You'll work closely with designers, backend engineers, and machine learning teams to create seamless, performant, and visually compelling experiences. This role is ideal for someone who enjoys solving complex UI challenges, influencing engineering standards, and helping shape the future of our frontend capability as we scale.

Key Responsibilities:

• Design, build, and maintain modern, performance‐focused frontend applications across web and desktop platforms.
• Develop and optimise reusable UI component libraries to ensure consistency and efficiency across products.
• Translate UX wireframes, prototypes, and design concepts into high‐quality, accessible user interfaces.
• Collaborate with backend engineers to integrate APIs, manage data flows, and ensure a seamless end‐to‐end experience.
• Establish and champion best practices in coding standards, architecture, documentation, and frontend processes.
• Conduct thorough code reviews to maintain code quality, scalability, and maintainability.
• Implement testing strategies using tools such as Jest, Cypress, or Playwright to support robust, reliable releases.
• Ensure interfaces are accessible and meet WCAG standards.
• Diagnose and resolve complex UI issues, including performance bottlenecks, browser inconsistencies, and rendering challenges.
• Contribute to continuous improvement by suggesting new tools, frameworks, and approaches to enhance developer experience and product quality.
• Work on innovative projects involving real‐time updates, visualisation of complex data structures, and interactions with AI/ML features.

Success in This Role Looks Like:

• High‐quality, scalable frontend applications delivered consistently, with clean architecture, reusable components, and strong performance across browsers and devices.
• A noticeable uplift in UI/UX standards, with improved consistency, accessibility, and user satisfaction across our products.
• A more mature frontend engineering practice, where you contribute to establishing clearer patterns, tooling, documentation, and ways of working for the team.
• Effective collaboration with designers, backend engineers, and ML teams, helping turn complex ideas and data into intuitive, user‐friendly experiences.
• Reduced bugs, faster delivery cycles, and improved reliability through thoughtful testing strategies, automation, and proactive technical decision‐making.
• Clear ownership and accountability, taking responsibility for end‐to‐end delivery of features, ensuring quality at each stage.
• Meaningful impact on product direction, providing input on architecture, UI strategy, component libraries, and future technical choices.
• Positive influence within the team, mentoring others, sharing knowledge, and helping build a supportive, high‐performing engineering culture.
• A proactive approach to innovation, introducing modern techniques, tools, or ideas that elevate the user experience and developer experience.
• Visible contributions to shaping the future of the frontend function, particularly as the team grows and expands into new technologies such as PWAs, desktop apps, and browser extensions.

Why Join Us?

• Shape the future of our frontend engineering function: You won't just join a team; you'll help define its standards, tooling, and ways of working as we scale.
• Work on genuinely interesting, complex challenges: From real‐time data interfaces and graph visualisation to AI‐driven interactions, PWAs, desktop apps, and browser extensions.
• Collaborate with talented engineers across Software, AI, Data, and UX: A supportive environment where ideas are shared, explored, and implemented quickly.
• High impact, low bureaucracy: Your work will directly influence the direction of our products and engineering culture, with the autonomy to own solutions end‐to‐end.
• Modern tech stack and forward‐thinking engineering culture: We embrace new tools, frameworks, and best practices that improve developer experience and product quality.
• Flexible working: Hybrid and remote options that support work–life balance while still offering the collaboration and connection of a close‐knit team.
• Career progression built into the role: Opportunity to grow into a Lead‐level position as the team expands and our product portfolio continues to evolve.
• A mission‐driven environment: Join a business building innovative platforms that combine Software, AI, and data to solve meaningful real‐world problems.

What We're Looking For:

We're looking for a highly capable Senior Frontend Engineer who brings both strong technical ability and the mindset needed to help shape a growing engineering function. You should have a solid foundation in modern frontend development, a passion for creating exceptional user experiences, and the confidence to take ownership of complex UI challenges.

Essential Experience & Skills:

• Proven experience in a Senior Frontend or equivalent role (typically 6+ years).
• Strong expertise in modern frontend technologies, HTML5, CSS3, JavaScript/TypeScript, ES6+.
• Deep experience with modern UI frameworks (React preferred, but Svelte or similar transferable skills also considered).
• Strong capability in building scalable, data‐rich applications and managing complex application state.
• Experience developing reusable component libraries or contributing to design systems.
• Proficiency working with RESTful APIs and integrating with backend services.
• Solid understanding of accessibility standards (e.g. WCAG) and how to implement them.
• Familiarity with testing tools such as Jest, Cypress, or Playwright for unit, E2E, and automation testing.
• Strong debugging skills with the ability to diagnose performance, rendering, and browser‐related issues.
• Comfortable working in fast‐paced, iterative environments with cross‐functional teams.

Soft Skills & Behaviours:

• A proactive, self‐driven approach with the ability to work independently and take ownership.
• Excellent communication skills, able to articulate decisions and collaborate effectively with technical and non‐technical colleagues.
• A growth mindset, open to feedback, learning, and exploring new tools, frameworks, or approaches.
• Strong problem‐solving skills, with a focus on delivering thoughtful and maintainable solutions.
• A team‐first mentality, with the willingness to support others, share knowledge, and contribute to positive team culture.
• Adaptability and comfort working in evolving environments as the team grows and new technologies emerge.

Desirable (Not Essential):

• Experience working on real‐time interfaces, desktop applications, PWAs, or browser extensions.
• Familiarity with visualising complex or graph‐based datasets.
• Exposure to AI/ML‐driven products or working alongside data/ML teams.
• A portfolio or examples of previous frontend work.

Security Clearance Requirements:

This role requires the successful candidate to be eligible for Security Check (SC) clearance. To meet this requirement, applicants must:

• Have the right to work in the UK
• Have lived in the UK continuously for the past 5 years
• Not have spent more than 6 months outside the UK in total during that period
• Be willing to undergo security vetting as part of the onboarding process.

Benefits:

• Flexible Working: We offer a hybrid & remote working models.
• Private Medical
• Inclusive Culture: Enjoy an inclusive culture and environment.
• Flexible Benefits: A flexible benefits programme to suit your needs (discounts etc).
• Holiday: Generous holiday allowance.
• Learning: Access to continuous learning and development opportunities.
• Bonus Potential: Bonus potential based on performance and business‐related factors.
• Discounts: Discounts on a wide range of products and services.
• Pension: Pension scheme contributions with Government Top‐Up.
• EV Car Scheme
• More Benefits: Explore additional benefits on our career site.

Please note that the talent acquisition team is managing this vacancy directly and we do not require agency support. Candidates who are successful will be required to undergo relevant security checks.

Our Process:

Our talent acquisition team will be in touch if you're successful, the team will arrange a short screening call (max 30 minutes) to learn more about you, and what you are looking for and answer any questions you may have. If all goes well, the team will share your profile with the hiring manager for review. Our interview process is tailored to each role but typically the first half of the process is run remotely with a final stage on‐site.

Equal Opportunities:

Here at TIG we are committed to equal opportunities and value diversity, equity and inclusion at our company. We do not discriminate based on race, religion, colour, national origin, sex, gender, gender expression, sexual orientation, age, marital status, veteran status, or disability status.

As a Group, we seek to ensure that individuals with disabilities receive reasonable accommodation throughout the hiring process and ultimately within the job itself. Please contact us to request any accommodations.