Senior Software Engineer, Copilot

Twin Health At Twin Health, we empower people to improve and prevent chronic metabolic diseases, like type 2 diabetes and obesity, with a new standard of care. Twin Health is the only company applying AI Digital Twin technology exclusively toward metabolic health. We start by building a dynamic model of each person's metabolism — drawing on thousands of data points from CGMs, smartwatches, and meal logs — that maps their personal path to better health. Guided by a dedicated clinical care team, our members have lowered their A1C below the diabetes range, achieved lasting weight loss, and reduced or even eliminated medications, all while living healthier, happier lives. Working here Our team at Twin Health is passionate, talented, and united by a shared purpose: to improve the metabolic health and happiness of our members. We believe in empowering every Twin to make a meaningful impact for our members, our clients, and each other, while enjoying a supportive, collaborative work environment. Twin has been recognized not only for our innovation but also for our culture, including: Innovator of the Year by the Employer Health Innovation Roundtable (EHIR), selected to CB Insights' Digital Health 150, and named one of Newsweek's Top Most Loved Workplace® . With more than $100 million raised in recent funding, including a $53 million Series E round in 2025 led by Maj Invest, and a $50 million investment in 2023 led by Temasek, Twin is scaling rapidly across the U.S. and globally. Backed by leading venture firms like ICONIQ Growth, Sequoia, Sofina, Temasek, and Peak XV, we are building the most impactful digital health company in the world. Join us as we reinvent the standard of care in metabolic health. Opportunity We're seeking a Senior Software Engineer to join our Copilot team and contribute significantly to the development of our new AI-powered platform. This platform is designed to optimize and enhance the efficiency of our clinical operations teams. This role offers a compelling opportunity at the intersection of backend engineering, healthcare technology, and system integrations. You will work closely with AI, mobile, and other talented engineers, as well as clinical operations teams, to streamline workflows and ultimately improve the member experience. Responsibilities • Design, develop, and scale backend services and RESTful APIs using FastAPI (Python) and Spring Boot (Java). • Architect and implement AI agents, including prompt engineering, evaluation, and continuous improvement workflows. • Build event-driven systems and well-defined internal APIs to enable reliable, real-time communication across services. • Drive technical architecture decisions in collaboration with engineering and product leadership. • Own projects end-to-end: design, implementation, testing, deployment, and operational support. • Manage and improve CI/CD pipelines to enable safe and rapid feature releases. • Monitor, troubleshoot, and optimize system performance to support high throughput and rapid growth. • Partner closely with Product, Design, DevOps, and AI/ML teams to align technical execution with Copilot product goals. • Write clean, testable, and maintainable code following engineering best practices. • Take on additional responsibilities as needed. Qualifications • Bachelor's degree in Computer Science, Engineering, or related STEM field (Master's preferred). • 5+ years of professional software engineering experience (backend or full-stack). • Strong proficiency in Python and/or Java, with hands-on experience building microservices using FastAPI and/or Spring Boot. • Deep understanding of API design (REST), authentication/authorization (OAuth2, JWT), and data modeling. • Experience designing event-driven systems and distributed architectures. • Practical experience working with AI systems, including prompt engineering or AI service integration. • Strong debugging and performance optimization skills in production environments • Excellent written and verbal communication skills. Additional Information • Remote role (U.S.-based candidates only). • Experience with AWS, Kubernetes, and CI/CD pipelines is a plus • Prior experience working on AI-native products or internal developer platforms is a plus. • Experience working in fast-paced, high-growth startup environments Compensation And Benefits The compensation range for this position is $160,000-$180,000 annually. In addition, Twin has an ambitious vision to empower people to live healthier and happier lives, and to achieve this purpose, we need the very best people to enhance our cutting-edge technology and medical science, deliver the best possible care, and turn our passion into value for our members, partners and investors. We are committed to delivering an outstanding culture and experience for every Twin employee through a company based on the values of passion, talent, and trust. We offer comprehensive benefits and perks in line with these principles