Senior Software Engineer - C#/ .NET

Reimagine the infrastructure of cancer care within a technology and science community that values integrity, inspires growth, and is uniquely positioned to create a more modern, connected oncology ecosystem. We’re looking for experienced software engineers to help us accomplish our mission to improve and extend lives by learning from the experience of every person with cancer. Are you ready to be the next changemaker in cancer care? What You'll Do Learning from the experience of every cancer patient involves building systems that scale, excellent UI, and robust data pipelines along the way. We are looking for an experienced backend or full-stack Software Engineer to contribute to the design, development, and maintenance of scalable, production-grade systems. You will work closely with product and engineering teams to deliver reliable software across our cloud-based infrastructure. Our team is responsible for mission critical services including our authentication service, API Proxy, and OmcoEMR EHR Service. In addition you will: Design, build, and maintain backend services and APIs Write clean, well-tested, production-ready code Participate in architecture and design discussions Translate requirements into working technical solutions Leverage cutting-edge AI-assisted development tools like Claude Code to streamline workflows and focus on solving complex oncology data challenges. Partner with oncologists, product leaders, and data scientists to translate complex product and regulatory requirements into elegant technical solutions. Who You Are You're a kind, passionate and collaborative problem-solver who values the opportunity to think beyond the way things are. In addition, you're an experienced software engineer with four plus years of experience developing robust and scalable solutions to challenging problems. You're passionate about using technology and building elegant scalable systems. You have a nose for value and empathy for your internal and external customers. You proactively identify problems that have a high impact on the business. You have 5+ years of professional experience building scalable, production-grade software. You have build backend services on .Net Framework and .Net Core You’ve worked with AWS Cloud (EC2, RDS, S3, IAM, SQS etx) You are proficient in C# or other object-oriented languages like C++, Java. You hold a bachelors, masters, and/or Ph.D. in computer science or a related field You have a good understanding of relational databases like PostgreSQL, MySQL, or MSSQL You are a strong communicator You seek simple approaches to complex solutions Extra Credit You have taken a leading role in delivering complex software systems all the way to production You contribute to open source projects You have experience with React or similar JS frameworks for building data-heavy internal tools You have familiarity with healthcare data domains (e.g., Clinical, Financial, or Research) and an understanding of provider workflows within an EHR Where You’ll Work In this hybrid role, you’ll have a defined work location that includes work from home and 3 office days set by you and your team. For more information on our approach to hybrid work, please visit the how we work website. Life at Flatiron At Flatiron Health, we offer a full range of benefits to support you and your loved ones so you can focus your working hours on improving cancer care and accelerating cancer research, and your non-working hours on everything else life has to offer: Work/life autonomy via flexible work hours and flexible paid time off Comprehensive compensation package 401(k) contribution to help you reach your retirement planning goals Financial health resources including 1:1 financial advice Mental well-being tools and services Parental benefits and policies including family-building care and generous leave Path to parenthood programs supporting fertility, adoption and surrogacy Travel support for safe healthcare services In addition to our robust benefit offerings, visit our Life at Flatiron page to learn how we support continuous learning and celebrate inclusion and belonging in the workplace. Best, Ai