Fullstack Software Engineer

About LightHearted AI

LightHearted AI is a VC-backed precision cardiology startup on a mission to prevent 10 million heart-related deaths by 2030. We combine photonics and AI to build non-invasive diagnostic technology that detects heart conditions faster, more accurately, and more affordably.

We work closely with researchers from the University of Glasgow, Harvard, and MIT, and are part of MedTech Innovator and the AI Pioneer Launch Programme. Our team is distributed across London, New York, and Bengaluru.

Role Overview

We're looking for a Fullstack Software Engineer who enjoys owning features end-to-end — from database schema to pixel-perfect UI. You'll build the software layer that connects our diagnostic hardware to clinicians and patients, working across mobile apps, desktop tools, backend services, and device interfaces.

This role suits a generalist who thrives in early-stage chaos, cares deeply about product quality, and gets excited about working at the intersection of software, hardware, and healthcare. If you've ever wondered how a photon becomes a clinical insight, you'll like it here.

What You'll Do

• Build and ship cross-platform mobile and desktop applications using Flutter
• Design and develop backend services and APIs using Python (FastAPI) and Node.js
• Deploy, serve, and monitor AI/ML models in production — handling inference pipelines, model versioning, and performance optimization
• Set up and maintain data pipelines for ingesting, processing, and storing sensor and diagnostic data
• Own DevOps workflows: CI/CD, containerization (Docker), cloud infrastructure (AWS/GCP), and deployment automation
• Architect data flows between frontend apps, backend services, AI models, and device-side software
• Build internal tools and device interfaces (GUI or CLI) for hardware and research teams
• Collaborate with product and design to shape clinical and patient-facing user experiences
• Work alongside hardware, firmware, and data teams to integrate software with physical diagnostic systems
• Write clean, well-documented, testable, and compliance-ready code
• Participate in design discussions, code reviews, and technical decision-making
• Debug, optimize, and improve performance across the full stack

Must Have

• ~2–4 years of professional fullstack development experience
• Cross-platform UI framework experience (Flutter, React Native, or similar)
• Backend experience with Python and/or Node.js
• Strong fundamentals in REST APIs, databases, and data flow design
• Working knowledge of Git, CI/CD, Docker, and at least one cloud provider
• Comfort in a fast-paced, remote-first startup environment
• Product mindset and attention to UX

Good to Have

• Hands-on Flutter and FastAPI experience
• Deploying and serving AI/ML models in production
• Building data pipelines (Airflow, Prefect, Kafka, or similar)
• Kubernetes or infrastructure-as-code (Terraform)
• Exposure to embedded systems, firmware, or hardware-integrated software
• Prior work in medtech, healthcare, or regulated environments (HIPAA, ISO 13485, IEC 62304)
• Life sciences or deep-tech background — degree or serious interest in biology, physics, photonics, or biomedical engineering
• Genuine curiosity — reads papers for fun, asks "why" more than "how," and gets pulled into rabbit holes

What We Offer

• Opportunity to work on impactful healthcare technology with real-world outcomes
• High ownership and responsibility from day one
• Collaboration with global research and engineering teams
• Flexible, remote-first work culture
• Fast learning curve across software, hardware, and AI systems

Diversity & Inclusion

We welcome applicants from all backgrounds and strongly encourage women and underrepresented talent in STEM and healthcare to apply.