Principal / Senior Software Engineer at Flagship Pioneering, Inc.

About the role

We are looking for a highly skilled and innovative Principal or Senior Software Engineer to join our dynamic team based in Cambridge, MA. This position offers an exciting opportunity to work on cutting-edge AI-driven applications and contribute to the development of scalable, secure, and efficient software solutions. The successful candidate will play a key role in designing, implementing, and maintaining software systems that support our research and product development initiatives. Collaboration with multidisciplinary teams including product managers, designers, and machine learning researchers is essential to translate complex requirements into impactful technical solutions. The role requires a strong foundation in software engineering principles, cloud infrastructure, and a passion for building innovative applications that push the boundaries of current technology.

Key facts

- Location: Cambridge, MA USA
- Engagement: Full-time
- Team: FL105

What you’ll do

- Lead the design, development, and deployment of features across both front-end and back-end components, ensuring they meet the needs of our customers and research teams.
- Collaborate closely with product managers, designers, and machine learning researchers to understand requirements and translate them into technical specifications and solutions.
- Oversee the entire lifecycle of feature development, from initial discovery, technical design, implementation, testing, and deployment to ongoing maintenance and iterative improvements.
- Manage the rollout process for new features, including planning, feature flagging, monitoring, and coordinating with engineering and product teams to ensure smooth releases.
- Utilize product analytics, conduct feature experiments, and gather user feedback to evaluate the effectiveness of features and inform future development priorities.
- Architect and implement scalable back-end systems optimized for AI applications, ensuring high performance, reliability, and security.
- Contribute to user interface and interaction design, providing technical insights to enhance usability and user experience.




- Improve application delivery practices by implementing continuous integration and continuous delivery (CI/CD) pipelines, automated testing, and operational best practices.
- Leverage AWS cloud infrastructure, including services such as ECS, S3, and Lambda, to create scalable, dependable, and efficient cloud-based applications and AI services.
- Maintain high standards of data security, privacy, and compliance across all applications, adhering to industry best practices and organizational policies.
- Collaborate with cross-functional teams to troubleshoot and resolve technical issues, ensuring system stability and performance.
- Stay updated with the latest developments in cloud computing, AI, and software engineering to continuously improve our technology stack and development processes.
- Document technical designs, system architectures, and best practices to facilitate knowledge sharing within the team.
- Mentor junior engineers and contribute to a culture of continuous learning and innovation.
- Participate in code reviews, technical discussions, and planning sessions to ensure high-quality deliverables.
- Support research initiatives by developing prototypes and proof-of-concept applications that demonstrate new ideas and technologies.

Requirements

- At least 5 years of professional experience in software development, with a focus on application building and system design.
- Significant hands-on experience working with AWS cloud services such as ECS, S3, and Lambda, or comparable cloud platforms.
- Proficiency in Python programming language, with a solid understanding of its ecosystem and best practices.
- Proven track record of developing scalable, efficient, and secure software applications in a production environment.
- Experience designing and implementing cloud-based architectures that support AI and machine learning workloads.
- Strong understanding of software development lifecycle, including agile methodologies, version control, testing,



and deployment.
- Excellent collaboration skills, with the ability to work effectively across multidisciplinary teams and communicate complex technical concepts clearly.
- Demonstrated problem-solving skills and a proactive approach to identifying and resolving technical challenges.
- Ability to manage multiple priorities and deliver high-quality results within deadlines.
- Knowledge of security best practices for cloud applications and data privacy regulations.

Nice to have

- Experience working with large language models (LLMs) and AI research projects.
- AWS certifications such as Solutions Architect Associate or Professional, demonstrating cloud expertise.
- Familiarity with AWS Cloud Development Kit (CDK) and Typescript for infrastructure as code and application development.
- Understanding of security considerations specific to SaaS solutions, including data encryption, access controls, and compliance standards.
- Experience with container orchestration tools beyond ECS, such as Kubernetes, is a plus.
- Knowledge of DevOps practices and tools to streamline development, testing, and deployment processes.

Skills & tools

- AWS (ECS, S3, Lambda, etc.)
- Python programming language
- CI/CD pipelines and automation tools
- Cloud infrastructure management and deployment
- Application security and data privacy practices
- Version control systems (e.g., Git)
- Monitoring and logging tools for cloud applications

Practical notes

The salary range for this position is between $108,000 and $209,000, depending on experience, skills, and qualifications.

The company offers a comprehensive benefits package, including healthcare coverage, an annual incentive program, retirement benefits, and additional perks.

FL105 is committed to fostering an inclusive and innovative work environment.

This salary estimate reflects FL105's good faith estimate as of the date of publication and is subject to change based on market conditions and individual negotiations.

The role involves on-site work at the Cambridge, MA office, with no remote or hybrid options specified.

The position requires compliance with all applicable data security, privacy, and ITAR regulations.

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📌 Principal / Senior Software Engineer (Cambridge)
🏢 Flagship Pioneering
📍 Cambridge