• Take responsibility for the architecture and implementation of sophisticated web applications — from micro-frontends and SPAs to design-system components • Translate design and conceptual specifications into high-performance, accessible frontends • Optimize the UX together with design and product teams • Advise clients on technical solutions and their implementation • Integrate headless CMS and backend services into SEO-friendly, maintainable solutions • Define and shape tooling standards (monorepo, Turbo/Turborepo, Vite, Storybook) • Ensure efficient workflows • Incorporate AI into development and product — from AI-assisted workflows to features such as chat integrations

• Implementar interfaces a partir de diseños UX/UI en código real (HTML, CSS, JavaScript/TypeScript). • Desarrollar utilizando frameworks modernos como React, Angular o Vue.js. • Asegurar consistencia visual y responsividad en distintos dispositivos (mobile-first). • Integrar sistemas de diseño, librerías de componentes y consumo de servicios REST. • Manejar estado de aplicación (Redux, Zustand, Context) y mecanismos de autenticación (JWT/OAuth).

Title: Staff Software Engineer (Web & Mobile) Location: London Job Description: About Tripadvisor The Tripadvisor Group connects people to experiences worth sharing, and aims to be the world’s most trusted source for travel and experiences. We leverage our brands, technology, and capabilities to connect our global audience with partners through rich content, travel guidance, and two-sided marketplaces for experiences, accommodations, restaurants, and other travel categories. The subsidiaries of Tripadvisor, Inc. (Nasdaq: TRIP), include a portfolio of travel brands and businesses, including Tripadvisor, Viator, and TheFork. The Tripadvisor Experiences Engineering team is distributed across Europe and is responsible for the platform, mobile apps and all their supporting infrastructure. We run the systems that help operators build their businesses and those which enable third parties to utilise our inventory. We provide the tools which help our customer services team provide world class service to travellers and operators internationally. About the role We're looking for a Staff/Principal Product Engineer who pairs deep engineering craft with strong product instincts. You'll work across the stack - mobile, web, backend - wherever the highest-leverage problem happens to live that quarter. You don't wait for a perfectly scoped ticket; you partner with product, design, and data to figure out what's worth building, then ship it end-to-end. We expect breadth. We also expect real depth in the mobile app ecosystem - our customer-facing experiences live there. But we're not hiring a mobile only specialist. We're hiring a generalist with mobile chops who can lead an iOS architecture review on Tuesday and untangle a backend latency regression on Wednesday. What you'll do - Identify, scope, and ship the changes that move business metrics - across mobile, web, services, and data layers - Architect long-lasting systems that hold up under real production conditions: performance, reliability, scalability, offline behavior, consistency - Lead technical design reviews across teams, weighing trade-offs not just in code but in product impact, time-to-ship, and operational cost - Drive operational maturity wherever it's weakest - release management, observability, incident response, performance monitoring - including in the mobile apps - Partner with PMs, designers, and engineering leaders to shape what we build, why, and in what order; you're a peer in those conversations, not a downstream implementer - Set the technical bar for the org by example: write the prototype, prove the pattern, then teach it - Communicate trade-offs clearly to engineers, product partners, and senior stakeholders What we're looking for - 10+ years of software experience, with significant time still spent hands-on in code - track record of shipping product-impacting work end-to-end, not just owning a layer - Real depth in the mobile app ecosystem (iOS and/or Android, with strong fluency in Swift and/or Kotlin and the surrounding ecosystem - offline sync, push, auth, persistence, networking, REST/GraphQL) - and credible breadth beyond it - Demonstrated breadth: you've worked seriously in at least one of {web frontend, backend services, data/infra, platform tooling} alongside mobile, and can hold your own in code review there - Strong product judgment: you've made calls about what not to build, and can defend them with evidence - Comfort troubleshooting in production across stacks - crash analysis, latency tracing, release-health debugging - Excellent cross-functional collaboration; you make the people around you better Nice to have - Background in marketplaces, bookings, or other transactional consumer products - Time spent close to data - experimentation, analytics instrumentation, or ML-adjacent work Our Cultural Pillars: Traveler first We exist to create value for our customer, the traveler. We enable our suppliers and partners to unlock this value. Their collective behaviors and insights are what drives us. Execution is our edge We act fast, experiment, learn from failure, iterate, and improve the solutions of tomorrow across every aspect of our business. Our execution is agile, data-driven, prioritised, and built to scale. We assume no problem is someone else’s problem and finish what can be done today, knowing tomorrow will bring fresh challenges. We succeed together The best outcomes are driven by empathic, humble, and diverse subject matter experts working toward shared goals. We collaborate relentlessly, challenge assumptions, give actionable feedback, and set each other up for success through empowered teams with a clear charter. We transparently take ownership of our growth, individually and as a team. We celebrate the quality of our effort, our learnings, and our collective achievements. #LI-SM1 #LI-Remote #LI-Hybrid

At Milestone Systems, people come first - and together we create solutions that make a real-world impact. Impact & Purpose Ready to make an impact? In this role, you’ll focus on developing and scaling critical supporting web products and applications that power our global business ecosystem. Location We are looking for an AI-Augmented Web Developer (Agentic AI, React, .NET), based in Sofia, Bulgaria (hybrid mode of working). Role Summary As an AI-Augmented Web Developer (Agentic AI, React, .NET), you'll act as a true "builder" who combines independent React expertise with a passion for AI-assisted engineering, plus a solid understanding of backend environments and cloud ecosystems to deliver seamless full-stack capabilities at speed. What You Will Do: - Web Product Development: Independently build, test, and scale responsive web applications and portals supporting Milestone's ecosystem. - AI-Driven Engineering: Leverage AI tools (e.g., Claude, GitHub Copilot, LLMs) to design, code, test, and deploy features rapidly. - End-to-End Ownership: Act as a builder, taking full technical ownership of components from initial frontend layout to API and cloud integration. - Full-Stack Collaboration: Bridge the gap between user interfaces and cloud-backed services, utilizing your backend and AWS knowledge to collaborate efficiently. - Workflow Innovation: Experiment with new AI workflows to improve code quality, reduce boilerplate, and increase development speed. What You Bring to the Team: - The Web Stack: Mid-level proficiency in modern React, JavaScript/TypeScript, and standard front-end web technologies. - Backend & Cloud Knowledge: Practical understanding of backend development, with experience or familiarity in .NET / C# and AWS being highly beneficial. - The Builder Mindset: A strong bias for action, capable of taking a task and executing it independently with minimal supervision. - AI Tooling Fluency: Active use of AI models like Claude and other coding assistants in your daily workflow to accelerate productivity and boost learning. - Code Quality Focus: The engineering discipline to critically audit, test, and refine AI-generated code for security, clean architecture, and performance. - Fluent written and spoken English. About the Team You will join a collaborative team of supportive, open-minded professionals dedicated to building high-quality solutions. In this role, you will work closely with your peers, as well as product management and design teams, to foster a culture of mutual support and shared success. How We Support You: - Individual development plan - Trainings and certifications - Flexibility - Management support and regular pulse check survey - Opportunities for cross- functional and cross- regional collaboration - Social events and space to connect What We Offer: - Hybrid-friendly / flexible way of working - 25 days’ vacation - Employer covered luxury health and dental packages - Best Doctors Insurance - Transportation benefits - Compliments gift card - Food vouchers - Multisport card covered by employer Excited to join a team that values people and innovation? Hit the Apply button and submit your CV in English today. About Us Milestone Systems is a leading provider of data-driven video technology software. Our portfolio includes XProtect video management software, Arcules video surveillance as a service, and BriefCam analytics. We amplify what organizations of any size can see, do, and achieve with video. Guided by our People First mindset - freedom, inclusion, and togetherness - we always consider our employees, partners, and communities in everything we do.