Software Engineer

iFIT’s vision is to create the world's most holistic health and fitness platform, integrating all elements of health - physical fitness, mental health, nutrition and active recovery - into a seamless interactive experience. We develop proprietary software that learns and adjusts to the habits of each person as it delivers immersive content that guides them on their own individual fitness journey. We are currently seeking an ambitious pace-setter to join our team as a Software Engineer remotely in the US. iFIT is looking for a mid-to-senior level Software Engineer to design and build the backend services powering iFIT's interactive fitness experiences. In this role, you will work on a service-oriented architecture in AWS, primarily using TypeScript and NestJS to create scalable microservices. Your contributions will directly impact millions of users worldwide, ensuring our platform remains reliable, performant, and primed for innovation. You will help drive the evolution of our APIs from REST to GraphQL, modernize legacy systems, and integrate with billing platforms such as Stripe, Apple, Google, and more. To facilitate collaboration, you must be available during core hours of 10 AM - 3 PM US Mountain Time, and will participate in a rotating on-call schedule approximately one week per rotation with the team. ROLE COMMITMENTS • Develop and maintain backend microservices in TypeScript and NestJS deployed via AWS ECS, ensuring services are well-designed, scalable, and aligned with our service-oriented architecture and best practices. • Design, implement, and document robust RESTful APIs that are secure, efficient, and easy for client teams to use. • Help migrate legacy serverless functions from AWS Lambda into containerized services on ECS, refactoring and re-architecting older systems for improved performance, maintainability, and consistency across the platform. ESSENTIAL DUTIES AND RESPONSIBILITIES • Work closely with front-end and mobile teams, product managers, and designers to deliver end-to-end features, clarify requirements, review designs, and ensure seamless integration across multiple services. • Write clean, well-tested code and participate in peer code reviews, maintaining comprehensive unit and integration tests and continuously improving CI/CD pipelines. • Take ownership of the reliability of the services you build, monitor performance, troubleshoot production issues, and participate in a rotating 24/7 on-call schedule to quickly address critical incidents and minimize downtime. EDUCATION & EXPERIENCE Education and Basic Qualifications • 4+ years of professional software engineering experience building backend or full-stack applications in a cloud environment. • Strong proficiency in TypeScript/JavaScript and Node.js with hands-on experience with backend frameworks — NestJS strongly preferred, or similar frameworks like Express/Koa with a willingness to learn NestJS. • Solid knowledge of AWS services and architecture, with experience deploying and running containerized applications in AWS ECS, EKS, or similar, and familiarity with microservices, distributed systems, and event-driven architecture. • Proven experience designing, building, and consuming RESTful APIs with a strong understanding of API security and performance considerations. • Experience with relational and NoSQL databases such as PostgreSQL, MySQL, and MongoDB, as well as caching mechanisms such as Redis, with the ability to write efficient queries and optimize data access in a cloud environment. • Comfortable with CI/CD pipelines and infrastructure-as-code tools such as Terraform or CloudFormation, and knowledge of monitoring and logging tools such as CloudWatch and Datadog. • Ability to jump into unfamiliar projects quickly and work acr