.Net Backend Developer

Senior Software Engineer (Backend)ABOUT LINGOLingo is building a cutting‑edge digital health platform that fuses continuous biosensor data, high‑performance backend engineering, and advanced analytics to help people live healthier, longer, fuller lives. Our systems process massive volumes of real‑time data, and the backend is the heartbeat that transforms biosensor signals into actionable health insights for our users.THE OPPORTUNITYWe're seeking a Senior Software Engineer ( Backend ) to design, build, and optimize Lingo's backend systems, ensuring they are scalable, resilient, and secure. You will play a pivotal role in implementing high‑performance APIs, event‑driven services, and data integrations across our global deployments. In this role, you'll work closely with Product, Mobile, Platform/SRE, and Data/ML teams to deliver robust cloud‑native services, troubleshoot complex issues, and continuously improve reliability and developer experience. You'll contribute your expertise to architecture discussions, lead implementation of key projects, and mentor junior engineers in best practices.WHAT YOU'LL DODesign, develop, and maintain scalable microservices and APIs for real‑time biosensor data processing.Implement event‑driven integrations with messaging/streaming systems (Kafka, RabbitMQ) and analytics pipelines.Collaborate with SRE to ensure observability, performance, and operational excellence across backend services.Participate in architecture and design reviews, contributing to decisions on service boundaries, data models, and communication patterns.Optimize backend services for low latency, high throughput, and cost efficiency.Apply privacy‑by‑design and security standards in line with HIPAA/GDPR compliance requirements.