Senior Frontend Developer – UI/UX

This is a fully remote position, open to applicants in Bulgaria.

📋 Description

• Develop a responsive, web-based dashboard for real-time data analytics.

• Oversee the front-end development of the Mission Engineering decision support framework.

• Create an architecture capable of managing continuous, low-latency data streams.

• Convert data outputs into highly interactive interfaces that allow military commanders to track mission performance indicators, receive alerts, and respond to those alerts.

• Concentrate on client-side performance, state management, and interface accuracy.

• Collaborate within an Agile team under the supervision of the Mission Engineering project lead.

• Transform provided UI/UX designs and data visualizations into production-quality frontend code.

• Maintain high standards for rendering speed, data security, and interface reliability.

• Engage in code reviews and contribute to architectural discussions.

• Proactively identify technical risks or obstacles to the team lead and project management.

• Assume full responsibility for the frontend features and user interactions delivered, covering technical design, client-side logic, implementation, end-to-end testing, and deployment.

⛳️ Requirements

• Proficiency in modern UI ecosystems; producing clean, idiomatic code that employs type safety (TypeScript) and asynchronous state management.

• Experience with contemporary frontend frameworks (React, Vue, or Angular); and/or capability with Python-based dashboarding frameworks such as Python Dash / Plotly or Streamlit.

• Advanced skills in modular and reusable UI design patterns; experience in extending complex UI component libraries (Tailwind UI, Material UI).

• Expertise in optimizing client-side rendering, including lazy loading, code-splitting, bundle size reduction, and effective DOM management for intricate UI displays.

• Proficient with advanced data visualization libraries (Plotly.js, D3.js, Recharts, or Chart.js) to create high-performance charts, trends, and multi-dimensional analytics matrices.

• Experience in implementing complex client-side workflows, including interactive legends, synchronized cross-filtering across charts, coordinated tooltips, and real-time state updates.

• Ability to enhance data visualization components to accommodate rapid, continuous data updates without inducing UI lag, memory leaks, or browser slowdowns.

• Familiarity with consuming RESTful or GraphQL APIs; resource modeling on the client side, managing paginated data subsets, error boundaries, and loading states.

• Proficient in parsing complex JSON payloads and utilizing frontend validation schemas to ensure UI stability against changing backend data structures.

• Experience with WebSockets, Server-Sent Events (SSE), or short-polling techniques to transmit real-time operational metrics to the analytical interface.

• Comprehensive strategies for UI testing, including unit and component testing.

• Capability to integrate with automation pipelines, enforcing automated code linting, syntax checking, and static builds.

• Advanced knowledge of Git workflows.

• Automated enforcement of static code checking, UI review processes, and up-to-date technical documentation.

• Awareness of OWASP Top 10, including input validation, output encoding, and secrets management.

• Management of Cross-Origin Resource Sharing (CORS) configurations, Content Security Policies (CSP), and secure browser storage.

• Skill in translating functional UI mockups and design specifications (from wireframes to detailed design assets) into clean, operational application layouts.

• Active involvement in sprint ceremonies, backlog refinement, estimation, and retrospectives.

• Clear communication of progress and blockers; collaboration with architects, front-end developers, QA, DevOps, and UX designers.

• Excellent proficiency in written and spoken English in a professional or international context.

🏝️ Benefits

• Opportunities for professional development.