Senior Software Engineer, Front End

ABOUT PIONEERING INTELLIGENCE Pioneering Intelligence builds on Flagship Pioneering’s legacy of founding cutting-edge science and computational ventures, harnessing recent advances in AI, machine learning, and data to accelerate fundamental research and create a portfolio of AI-first companies. As part of Flagship’s integrated model of science, entrepreneurship, and capital, it transforms breakthrough ideas into world-changing companies, elevating the AI advances happening across the ecosystem in human health, sustainability, and beyond. Position Summary We are seeking a Senior Front End Engineer. As a key contributor in this early-stage initiative, you will architect and implement the user experience for a new platform that leverages large language models (LLMs) and AI agents to enhance complex, high-stakes workflows. This is a user-first, AI-augmented product — your work will transform abstract reasoning tasks into intuitive, high-performance tools that empower experts across diverse research domains. You will lead front-end development and collaborate closely with engineers, AI scientists, product designers, and end users. This is a rare opportunity to shape a greenfield product at the intersection of usability, flexibility, and advanced reasoning. Key Responsibilities Architect, develop, and maintain high-quality, testable front-end code and workflows aligned with complex scientific and analytical use cases. Translate user stories, wireframes, and prototypes into production-ready features emphasizing clarity, maintainability, and reusability. Implement responsive, accessible, and performant UIs optimized for data-rich, interactive workflows. Ensure security, scalability, and observability of front-end services in cloud environments (AWS). Design and implement user interfaces from scratch, combining strong visual design with robust engineering. Create and maintain scalable, consistent, and visually appealing UI components using a modern React.js stack. Maintain front-end quality through comprehensive testing and validation of user flows and interface behavior. Develop and maintain test suites (unit, integration, and end-to-end) for UI reliability. Apply DevOps/ GitOps practices for automated testing, deployment, and monitoring. Mentor engineers and scientists, driving technical quality and ensuring extensibility and performance across evolving use cases. Qualifications B.S. in Computer Science, Engineering, or related field, with 6+ years of professional software development experience. Expertise with modern front-end frameworks and tools, including React.js, TypeScript, Tailwind CSS, Redux Toolkit, Playwright, and Shadcn . Strong experience with Node.js . Skilled in writing and maintaining comprehensive test suites ( Jest, React Testing Library, Cypress ). Experience with system design, performance optimization, observability, and operational excellence for parallel LLM workloads. Strong intuition for UX design and a passion for building intuitive, workflow-first products. Excellent communication skills and a collaborative mindset in fast-moving, cross-functional environments. Preferred Qualifications Background in scientific domains such as biology, chemistry, or complex systems (a plus, not required ). Why Join Us By joining this initiative within Flagship’s Pioneering Intelligence group, you will: Help define a new category of intelligent software tools for real-time human–AI collaboration. Build a greenfield product at the intersection of usability, reasoning, and scientific innovation. Collaborate with visionary thinkers and top-tier researchers across Flagship’s ecosystem. Thrive in a supportive, mission-driven culture with access to world-class technical and operational resources. Shape the future of AI-powered discovery in a role that combines engineering excellence with health impact. About Flagship Pioneering Flagship Pioneering ... (truncated, view full listing at source)