PitchMeAI Jobs
Flagship Pioneering, Inc.

Principal Backend Engineer

Flagship Pioneering, Inc. · Cambridge, MA USA

Posted 22 days ago · $188,000 - $258,500

or apply directly on Flagship Pioneering, Inc.'s site. We never take the application ourselves.

Is this posting real?

This role has been open
22 days
Flagship Pioneering, Inc.'s roles stay open a median of 45 days
Reposted
No
Salary listed
Yes
89% of Flagship Pioneering, Inc.'s roles list one
Ghost-job risk at Flagship Pioneering, Inc.
high
50 stale, 1 reposted of 100 open
Hiring momentum
144 roles opened in the last 90 days
↑ up vs. the prior 90 days
Last confirmed on the employer's board
2026-09-17

Measured from postings appearing on and disappearing from Flagship Pioneering, Inc.'s own greenhouse board since 2026-08-03. Full hiring picture for Flagship Pioneering, Inc..

About this role

As a Principal Backend Engineer at Extuitive, you will lead the architecture, development, and scaling of core backend systems for an AI-driven platform. Your responsibilities include designing high-throughput services, managing data pipelines, and integrating with third-party services while ensuring system reliability and security. You will also influence technical strategy and best practices, and support various platform needs as they arise.

Our read on this posting4.0out of 5
benefits
2/5
freshness
4/5
career value
4/5
role clarity
5/5
pay transparency
5/5

Scored from the posting itself — how clearly the role is described, how much it says about pay and benefits, and how recently it was listed. Not a judgement of Flagship Pioneering, Inc. as an employer.

What you need

  • 8+ years of backend engineering experience
  • Experience with high velocity agentic coding under strict security requirements
  • Bachelor’s degree in Computer Science, Software Engineering, or equivalent practical experience
  • Strong expertise in backend languages and frameworks (Node.js/TypeScript, Go, Python, or similar)
  • Experience designing scalable distributed systems, microservices, and event-driven architectures
  • Deep experience with third-party integrations, REST/GraphQL APIs, webhooks, and rate-limited services

Nice to have

  • Experience building and shipping features quickly in early-stage startups
  • Exposure to multiple backend domains (analytics, payments, notifications, workflow orchestration)
  • Hands-on experience with serverless or edge architectures for rapid iteration
  • Familiarity with low-friction integrations with third-party tools and SaaS platforms
  • Track record of scaling systems from small MVPs to production-ready services

What you get

  • Healthcare coverage
  • Annual incentive program
  • Retirement benefits
  • Broad range of other benefits

Worth weighing

  • Salary range provided is quite broad ($188,000 - $258,500) and may vary based on qualifications and experience.
  • The role involves working in a fast-paced environment which may require adaptability to changing requirements.
  • The company operates like a 'special ops unit', indicating a high-pressure work culture.

Summarised from Flagship Pioneering, Inc.'s posting. Read the full original.

Listed by Flagship Pioneering, Inc. on their greenhouse job board, last confirmed open on 2026-09-17. PitchMeAI is not the employer.

More roles at Flagship Pioneering, Inc.

All 100 open roles at Flagship Pioneering, Inc. →