Flagship Pioneering
Principal / Senior Software Engineer
$108K–$209K
Cambridge, MA USA +1 · Principal · Full-time · Posted Jul 30, 2026
- Location
- Cambridge, MA USA
Iris Labs, Inc. - Experience
- 5+ years of software development experience focused on building applications.
About the job
Leads development of customer-facing applications and AI-enabled backend services, from product discovery and design through release, measurement, and iteration.
What you'll do
- Lead full-stack feature development and collaborate with product, design, and research teams to turn customer needs into product features.
- Own feature lifecycle, including technical design, releases, monitoring, analytics, experiments, and iteration.
- Design scalable AWS-based systems and improve delivery, testing, security, privacy, and operational practices.
What they ask for
- 5+ years of experience in software development focused on building applications.
- Extensive experience with AWS services (including ECS, S3, Lambda, etc) or a similar cloud services provider.
- Proficient in Python.
- Demonstrated ability to build scalable, efficient, and secure software applications.
Nice to have
- Experience with LLM development.
- AWS Certifications, such as Solutions Architect Associate or Professional; experience with AWS CDK and Typescript; or knowledge of security best practices for SaaS solutions.
Pay
$108,000 - $209,000 USD base salary
Tools
AWS, ECS, S3, Lambda, Python, AWS CDK, Typescript
AI focus
Develops AI-enabled backend components and AI-powered services; LLM development is preferred experience.
Model-written summary · the original posting is authoritative