Senior Backend Engineer (.NET)

Binariks is seeking a Senior Backend Engineer (.NET) for a healthcare project building a Connected Device Data Platform that ingests biometric data from smartwatch wearables via AWS IoT Core and delivers it to a companion mobile app.

This is a hands-on senior role requiring strong autonomy and ownership of a .NET Core codebase with extensive AWS cloud-native services experience.

• Own and evolve the Lifeline Connect REST API (.NET Core) serving the Flutter mobile app
• Manage and extend PostgreSQL data models for patient/device data, biometric records, user management, and alarm events
• Build the alarm/notification service using AWS Lambda and Amazon MSK (Kafka), delivering notifications via Twilio and Firebase
• Develop and maintain the IoT data enrichment pipeline, processing MQTTS device data and persisting it to InfluxDB and PostgreSQL
• Integrate authentication and user management using Amazon Cognito
• Contribute to building the IoT Device Manager for registration and provisioning via AWS IoT Core
• Analyze incoming Java code deliveries from the hardware team to understand device-side logic and integration points
• Implement integrations with third-party monitoring services and healthcare providers
• Prepare the platform for AWS HealthLake (FHIR) integration
• Participate in 2-3 week sprint cycles and maintain technical documentation
• Contribute to HIPAA compliance foundations and support future AI/ML-driven features

• 5+ years of backend development experience with .NET Core / C#
• Strong experience designing and building REST APIs with ASP.NET Core
• Solid PostgreSQL skills (data modeling, query optimization, migrations)
• Hands-on experience with AWS services: Lambda, S3, RDS, CloudWatch, SNS/SQS, Cognito
• Experience with event-driven/message-based architectures (Amazon MSK / Kafka or similar)
• Experience with microservices architecture and serverless patterns (AWS Lambda)
• Working knowledge of Docker/Kubernetes (AWS EKS)
• Experience integrating third-party notification services (Twilio, Firebase, or similar)
• Ability to read and analyze unfamiliar codebases, including Java
• Good English communication skills for daily interaction with PM and cross-team coordination
• Experience working in Agile/Scrum environments

Plus: Healthcare platforms experience, biometric data processing, HIPAA/GDPR compliance, InfluxDB or AWS Timestream, Amazon Cognito, FHIR standards, AWS HealthLake, AI/ML services integration

This position provides the possibility of business trips (EU, USA) and occasional visits to the Lviv office when needed.