• Write high-quality, maintainable code in Elixir/Phoenix • Build and maintain scalable, fault-tolerant systems leveraging Elixir's concurrency model • Contribute to robust data pipelines for data ingestion, processing, and transformation • Help ensure the performance, reliability, and security of distributed systems • Work with GCP cloud services and modern infrastructure practices • Implement event-driven architectures and real-time system components • Collaborate on technical decisions and contribute to architectural discussions • Participate in code reviews and help maintain high standards for code quality • Work within a team environment to build scalable systems • Contribute to technical documentation and knowledge sharing initiatives

• Work closely with the architecture team and drive the complex system design. • Perform code reviews and mentor the development team with best practices. • Make key design and technical implementation on the complex system and help guide engineering vision. • Work closely with stakeholders to define requirements, and transform into highly scalable and reliable, developer-friendly microservices APIs. • Design, build and maintain highly sustainable systems to support our business applications. • Continue improving process and procedure and evangelizing best practices. • Be a contributing team member to the end-to-end execution of compliance initiatives. • Be responsible for practicing technical design, developing new functionality and maintaining existing components. • This role works with PHI on a regular basis both in paper and electronic form and have access to various technologies to access PHI (paper and electronic) in order to perform the job. • Must complete training relating to HIPAA/PHI privacy, General Policies and Procedure Compliance training and security training as soon as possible but not later than the first 30 days of hire. • Must maintain a current status on Natera training requirements.

This description is a summary of our understanding of the job description. Click on 'Apply' button to find out more. Role Description Flex is looking for a Staff Software Engineer to join our core platform team. We want engineers with ideas (because they’ll definitely be heard on our small and tight-knit team) and ambition! Successful devs will feel comfortable in a startup environment and will be happy to work in a remote-first team with a lot of independence. As a Staff Engineer at Flex, you’ll help set technical direction and shape the long-term architecture of our backend services while still being hands-on with coding and delivery. You will collaborate across engineering, product, design, and other stakeholders to ensure scalable, reliable, and impactful systems that power consumer experiences, partner integrations, and our core business platforms. You’ll also play a critical role in mentoring engineers, elevating technical standards, and ensuring the success of projects end-to-end. What You’ll Do - Design, implement and maintain our Finance service and internal tooling, including financial reporting, reconciliation/audit process. - Design and develop new APIs and functionalities to support large money movements across our banking partners via different payment rails, such ACH. - Scale out core platform to support business growth while maintaining performance and reliability. - Continuously improving our daily operations with automation, tooling, design evolution, observability etc. - Work closely with product, analytics, finance and engineering peers to launch new financial features into our platform. Qualifications - 6+ years of experience in software development or a related field. - Experience in technical leadership, guiding engineering teams through complex projects. - Experience with Java, Python, Golang, or TypeScript/Node.js. - Strong experience with relational SQL and NoSQL databases, such as MySQL/PostgreSQL/DynamoDB. - Experience in designing and developing fault-tolerant and scalable distributed systems. - Experience with AWS cloud services: ESC/EKS, Lambda, API Gateway, VPN, RDS etc. - Infrastructure as code (AWS CLI, AWS CDK/Terraform). - Strong communication skills with the ability to understand and explain technical issues to a non-technical audience. - Follow engineering best practices as well as propose new ones. - Experience with finance reporting and reconciliation. - Deep experience with writing complex queries and data mining. Requirements - Flex takes a market-based approach to pay, and compensation may vary depending on your primary work location. Work locations are categorized into one of three tiers based on a cost of labor index for that geographic area. The successful candidate’s starting pay will be commensurate with their experience, qualifications, and Flex’s internal leveling guidelines and benchmarks. - Tier A: (NYC/SF): $200,000 —$250,000 USD - Tier B: $180,000—$225,000 USD - Tier C: $170,000 —$212,500 USD Benefits - Competitive medical, dental, and vision available from Day 1. - Company equity. - 401(k) plan with company match (our company match kicks off at the beginning of 2026). - Unlimited paid time off + 13 company paid holidays. - Parental leave. - Flex Cares Program. - Free Flex subscription. Life at Flex We understand that it takes a diverse team of highly intelligent, curious, determined, empathetic, and self-aware people to grow a successful company. Our HQ is located in New York City, but we have employees located throughout the US, Australia, Canada, and South America. We are growing quickly, but deliberately, with a focus on building an inclusive culture. Our dynamic team has incredible perspectives to share, just as we know you do, and we take great pride in being an equal opportunity workplace.

• Own the architecture and technical direction for the Libraries Platform: the services, pipelines, and package index that power secure, reproducible build, test, and distribution workflows for libraries across multiple ecosystems (Java, JavaScript, Python/AI/ML). • Design and maintain automation for artifact creation, updates, and verification, including vulnerability scanning, remediation workflows, SBOM and provenance generation, and policy enforcement across our library catalog. • Build and operate shared platform services such as package indexes, registry mirrors, metadata services, and orchestration tooling that serve both external customers and internal ecosystem teams. • Develop internal developer tools and CLIs (often in Go) that improve how we build, test, and ship libraries at scale, including integration with build systems and CI/CD for multiple ecosystems. • Drive reliability, scalability, and observability for the Libraries platform: define SLOs, build monitoring and alerting, and lead incident response and post‑incident improvements. • Solve complex dependency and build issues in production environments, from toolchain and compiler problems to CI/CD flakiness and registry/package index edge cases. • Partner closely with ecosystem teams (Java, JavaScript, Python/AI/ML), Platform, Delivery, Sustaining, and Security to ensure the platform meets reliability, security, and product requirements. • Mentor and unblock other engineers through design reviews, documentation, and hands‑on debugging, helping to “code culture” into how we build and run our libraries platform.