Sam Rossilli

Software Engineer @ Stellar Health | AWS, Java, React

United States

About

Software Engineer specializing in scalable backend systems, cloud-native architectures, and cross-platform mobile development. I have experience building highly available, event-driven systems using AWS (Lambda, ECS, Step Functions, DynamoDB, S3), and delivering user-facing features across web and mobile platforms (React, React Native, TypeScript). I'm currently a Software Engineer at Stellar Health, working on the Total-cost-of-care (TCOC) team. Our team's mission is to reduce the total cost of healthcare by building software that helps providers deliver higher quality, more efficient care. Previously at Amazon, I’ve led development of mission-critical infrastructure supporting thousands of delivery partners, including real-time metrics pipelines, time-series analytics platforms, and compliance-critical mobile features. Outside of work, I apply my passion for AI and wellness to personal projects like Mira, an LLM-powered journaling app built with AWS Bedrock, DynamoDB, ElastiCache, and React Native. I’m especially interested in LLM applications, serverless architecture, and developer experience. Core skills: Languages: TypeScript, Java, Python, C++, Kotlin Frameworks: React, React Native, Redux, LangChain Cloud: AWS (Lambda, ECS, CDK, API Gateway, DynamoDB, Step Functions, SQS/SNS, Timestream) Other: CI/CD, WebSockets, Serverless, LLM apps, Feature Experimentation, Infrastructure-as-Code

Experience

  • Software Engineer 2 at Stellar Health
    Sep 2025 - Present · 10 mos

    Working on the Total-cost-of-care (TCOC) team. Our team's mission is to reduce the total cost of healthcare by building software that helps providers deliver higher quality, more efficient care.

  • Amazon (Nashville Metropolitan Area · On-site)
    • Software Development Engineer 2
      Oct 2024 - Sep 2025 · 1 yr

      Helping Amazon's delivery service partners engage, develop, and support their employees by building software to enable employee-level data insights, coaching suggestions, career development assistance, and structured recognition tools.

    • Software Development Engineer
      Jun 2022 - Oct 2024 · 2 yrs 5 mos

  • Automation Engineer Intern at UScellular
    Jun 2021 - Aug 2021 · 3 mos

    Designed, Developed, and Documented Python code for a network performance dashboard that saves an estimated 360 work hours a year Collaborated with operations engineers to develop and implement key performance indicators for the network components. Developed an understanding of real-time communication networks and protocols including SIP and Diameter Protocol.