• Design, build, and maintain outstanding, reusable, reliable, and testable TypeScript code. • You will build and maintain first-class software used by numerous businesses. • Review the work of your colleagues. • As a great teammate, continuously improve the team’s processes, brainstorm ideas, and communicate statuses and progress. • Mentor other people, provide feedback, and continuously improve yourself. • Provide suggestions to our stakeholders regarding usability improvements. • Proactively identify technical debt and product areas that require attention or improvements and suggest improvements in our technology stack. • In the first week, expect to: Begin your onboarding and integration into Toptal. Get familiar with our product and team structure. Review our extensive Toptal Engineering Documentation to become familiar with our working processes. Meet your mentor and work together on the ideal ramp-up plan. • In the first month, expect to: Get familiar with our front-end architecture and all the tools that we use. Learn about the processes that we follow. Attend regular meetings, like technical calls, retrospectives, and the monthly Engineering All-hands meeting. Develop your first tasks and have them deployed to production. Develop a deeper understanding of our technology, processes, and product pipeline. • In the first three months, expect to: Actively supply software planning, development, and maintenance. Be ready to propose and implement improvements to Toptal’s processes and codebase. Get comfortable in your daily work within your team and deliver value in a regular cadence. Review code written by your colleagues. Suggest and implement improvements to Toptal’s processes and codebase, while exercising discretion and independent judgment. • In the first six months, expect to: Contribute to planning and executing multi-sprint initiatives within your team. Become a key part of the team, be responsible for certain areas, and help others inside and outside of the team. Lead technical initiatives on our team. • In the first year, expect to: Have a detailed understanding of Toptal’s technical stack, collaboration rituals, processes, performance, and future work. Determine what your career path looks like at Toptal. Mentor Toptal’s new team members.

• Manage and support frontend development tasks across multiple UK-based projects • Handle bug fixes, feature requests, and code reviews in a timely manner • Communicate effectively with internal teams and external stakeholders across time zones • Maintain accurate records of development progress, documentation, and version control • Use relevant tools such as React, TypeScript, Git, and modern CI/CD pipelines • Support the wider team with technical guidance, sprint planning, and delivery • Identify opportunities to improve performance, accessibility, and user experience

Role Description As a Senior UI Engineer for the Fleet Manager product, you will play a crucial role in leading the development and architecture of the frontend systems that enable clients to manage a fleet of sensors at scale and act on complex security data. This is a role for a high-agency engineer who doesn't just build components, but owns the user experience from end-to-end. You will bridge the gap between sophisticated data-heavy APIs and intuitive user interfaces, ensuring our customers can secure their enterprise with speed and precision. - Architect & Develop Modern UI: Design, develop, and maintain modern, scalable web applications using React + Typescript and related frontend technologies to drive the Investigator product forward. - Contribute to the Frontend Lifecycle: Help with the implementation of complex user flows by translating wireframes and UX designs into high-quality, accessible, and performant UI components. - Data-Intensive Integration: Work with the integration and consumption of GraphQL and REST APIs to power interactive, data-heavy visual interfaces capable of handling massive network datasets. - Uphold Technical Excellence: Maintain and elevate code quality through rigorous testing, detailed documentation, and sophisticated code reviews. - Autonomous Agile Delivery: Navigate agile development workflows—including sprint planning, retrospectives, and daily standups—with high independence and a focus on delivery. Qualifications - Professional Experience: 3 to 7 years of professional software development experience, with a proven track record in Senior level roles. - Frontend Mastery: Advanced in working with JavaScript/Typescript, Design Library Components, and React. - Data & API Proficiency: Experience building and consuming GraphQL and REST APIs to support rich, data-heavy visual user interfaces. - Architectural Knowledge: Solid understanding of Relational databases to better partner with backend teams. - UX Partnership: Significant experience working directly with UX Design Teams to refine and implement complex user flows. - Agile Fluency: Experience adopting and using Agile development methodologies within high-performing engineering teams. - Communication: Excellent communication skills with the ability to collaborate across multiple teams and influence technical outcomes. - Education: Bachelor's degree in Computer Science or related fields, or equivalent professional experience. Benefits - Fueled by investments from top-tier venture capital organizations such as Crowdstrike, Accel and Insight. - Fastest growing network detection and response platform in the industry. - Leading the way with AI-assisted workflows, machine learning models, cloud security and SaaS-based solutions. - Collaborative, inclusive, and growth-oriented culture. - Geographically distributed yet connected employee base with employees working from home and office locations around the world. - Commitment to diversity and fostering an inclusive environment. Compensation Range $214,000 — $277,000 USD

Role Description Our customer's product is an AI-powered platform that helps businesses make better decisions and work more efficiently. It uses advanced analytics and machine learning to analyze large amounts of data and provide useful insights and predictions. The platform is widely used in various industries, including healthcare, to optimize processes, improve customer experiences, and support innovation. It integrates easily with existing systems, making it easier for teams to make quick, data-driven decisions to deliver cutting-edge solutions. - Developing and implementing highly responsive user interface components using React concepts. - Instill best practices for software development, ensure designs meet requirements, and deliver high-quality work on schedule. - Writing application interface codes using JavaScript following React.js workflows. - Troubleshooting interface software and debugging application codes. - Developing and implementing front-end architecture to support user interface concepts. - Optimizing components for maximum performance across a vast array of web-capable devices and browsers. - Documenting application changes and developing updates. Qualifications - Strong experience in frontend development, specifically 5+ years of commercial experience with UI development using ReactJS. - Bachelor’s or Master’s degree in Computer Science or a related field. - React Expertise: Strong knowledge of React.js and related workflows. - Core Web Technologies: In-depth knowledge of JavaScript, HTML, and CSS. - State Management & Tools: Proficiency with Redux, Flux, Webpack, and Enzyme. - Software Lifecycle: Experience with code reviews, source control, build processes, and testing. Requirements - Nice to have skills: - Advanced Frameworks: Experience with TypeScript, Angular, or Vue.js. - Architecture: Familiarity with micro-frontend architecture to improve code modularity. - Testing & Quality: Hands-on experience with testing tools like Cypress or Enzyme. - Specialized Tools: Knowledge of Socket.io, Strapi CMS, or 3CX APIs. - Cross-functional Collaboration: Experience working with UX, Product Management, or Marketing teams. Benefits - Awesome projects with an impact. - Udemy courses of your choice. - Team-buildings, events, marathons & charity activities to connect and recharge. - Workshops, trainings, expert knowledge-sharing that keep you growing. - Clear career path. - Absence days for work-life balance. - Flexible hours & work setup - work from anywhere and organize your day your way.