Principal Backend Developer

COMPANY DESCRIPTION

Extuitive is a Flagship Pioneeringbacked startup reimagining product innovation for the AI era. Our mission is to empower entrepreneurs and direct-to-consumer (D2C) brands with AI-driven tools that simplify accelerate and scale the launch of new products. Based in Cambridge MA we operate like a special ops unitfast-moving data-driven and relentlessly focused on impact.

THE ROLE

As a Principal Backend Engineer youll be a technical leader responsible for architecting building and scaling the core backend systems that power our platform. Youll drive the design of high-throughput services resilient data pipelines and integrations with mission-critical third-party providers. Working closely with product managers designers and engineering leadership youll translate complex requirements into robust elegant systems that support rapid growth. Youll mentor engineers influence long-term technical strategy and help evolve our platform architecture to maintain security and reliability as we scale.

KEY RESPONSIBILITIES

• Own Core Backend Systems Design build and maintain scalable services APIs and platform infrastructure. Ensure reliability observability and maintainability.
• Drive Large-Scale Data Pipelines Architect and operate high-volume resilient data pipelines for ingestion transformation and analytics.
• Lead Third-Party Integrations Build and maintain integrations with external vendors ensuring reliability observability and long-term maintainability.
• Influence Architecture & Best Practices Shape backend architecture coding standards testing frameworks CI/CD pipelines and operational excellence.
• Mentor & Lead Engineers Provide guidance on system design debugging at scale and engineering practices.
• Wear Multiple Hats Support DevOps troubleshooting or other platform needs when necessary.

PROFESSIONAL EXPERIENCE & QUALIFICATIONS

• 8 years of backend engineering experience.
• Bachelors degree in Computer Science Software Engineering or equivalent practical experience.
• Strong expertise in backend languages and frameworks ( 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.
• Proficiency with SQL/NoSQL databases data pipelines and performance optimization.
• Familiarity with cloud platforms (AWS GCP) and containerized/deployed systems (Docker Kubernetes).
• Strong testing CI/CD and observability practices.
• Comfortable working in a fast-paced evolving environment with minimal oversight.

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.
• Comfort with ambiguity and making trade-offs between speed quality and maintainability.

ABOUT FLAGSHIP PIONEERING:

Flagship Pioneering invents and builds platform companies each with the potential for multiple products that transform human health sustainability and beyond. Since its launch in 2000 Flagship has originated more than 100 companies. Many of these companies have addressed humanitys most urgent challenges: vaccinating billions of people against COVID-19 curing intractable diseases improving human health preempting illness and feeding the world by improving the resiliency and sustainability of agriculture.

Flagship has been recognized twice on FORTUNEs Change the World list an annual ranking of companies that have made a positive social and environmental impact through activities that are part of their core business strategies and has been twice named to Fast Companys annual list of the Worlds Most Innovative Companies. Learn more about Flagship at.

At Flagship we accept impossible missions to enable bigger leaps. Our core values guide us through uncertainty and toward lasting impact.

We are an equal opportunity employer. All qualified applicants will be considered for employment without regard to race color religion sex sexual orientation gender identity national origin disability protected veteran status or any other characteristic protected by law.

We recognize that great candidates often bring unique strengths without fulfilling every qualification. If you have some of the experience listed above but not all please apply anyway. We are dedicated to building diverse and inclusive teams and look forward to learning more about your background and interest in Flagship.

Recruitment & Staffing Agencies: Flagship Pioneering and its affiliated Flagship Lab companies (collectively FSP) do not accept unsolicited resumes from any source other than candidates. The submission of unsolicited resumes by recruitment or staffing agencies to FSP or its employees is strictly prohibited unless contacted directly by Flagship Pioneerings internal Talent Acquisition team. Any resume submitted by an agency in the absence of a signed agreement will automatically become the property of FSP and FSP will not owe any referral or other fees with respect thereto.

The salary range for this role is $152000 - $209000. Compensation for the role will depend on a number of factors including a candidates qualifications skills competencies and experience. Extuitive Inc. currently offers healthcare coverage annual incentive program retirement benefits and a broad range of other benefits. Compensation and benefits information is based on Extuitive Inc.s good faith estimate as of the date of publication and may be modified in the future.

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