Principal Software Engineer - Agentic Platform

Pioneering Intelligence; Cambridge (MA); On-site; USD 188,000 - 257,500; Full time

Benefits offered by this job

Healthcare coverage

Annual incentive program

Retirement benefits

Job summary

Pioneering Intelligence in Cambridge, Massachusetts, is seeking a Principal Software Engineer to take charge of the agentic platform, developing intelligent software systems that leverage AI. In this role, you will manage end-to-end workflows and collaborate with teams to align technical standards.

The ideal candidate will have over 10 years of experience in software development and a strong track record in scaling distributed systems. A collaborative approach and excellent communication skills are essential for working within interdisciplinary teams.

Qualifications

• 10+ years of professional software development experience.
• Demonstrated track record in maintaining large-scale distributed systems.
• Strong experience in creating infrastructure-as-code.

Responsibilities

• Own the agentic platform from prototype to production.
• Architect event-driven distributed systems.
• Deliver infrastructure-as-code reference implementations.

Skills

Workflow orchestration

Event-driven architecture

Cloud-native engineering on AWS

SDK and API design

Excellent communication skills

Collaborative working style

Education

B.S. or M.S. in Computer Science or related field

Tools

AWS

Terraform

Docker

Job description

ABOUT PIONEERING INTELLIGENCE
Pioneering Intelligence builds on Flagship Pioneering’s legacy of founding cutting‑edge science and computational ventures, harnessing advances in AI, machine learning, and data to accelerate fundamental research and create a portfolio of AI‑first companies. It transforms breakthrough ideas into world‑changing companies across human health, sustainability, and beyond.

Role

The Pioneering Intelligence group at Flagship Pioneering is building intelligent software systems that integrate agentic AI with scientific reasoning to accelerate discovery and decision‑making. We seek a Principal Software Engineer to own the underlying agentic platform – the durable orchestration layer where long‑running, multi‑agent, multi‑model scientific workflows run reliably. This hands‑on architect role requires a senior engineer who has built and operated distributed systems at scale and wants to take agentic AI from research to production.

Key Responsibilities

• Own the agentic platform end‑to‑end, from research prototype to production, building the durable orchestration layer for long‑running, multi‑stage scientific workflows.
• Architect workflow orchestration, evaluation frameworks, and event‑driven distributed systems that deliver scale, resilience, and reliability.
• Define SDK abstractions and API contracts between model and agent outputs and downstream consumers, decoupling rapid model iteration from product stability and reducing integration friction across teams.
• Deliver infrastructure‑as‑code reference implementations (AWS CDK, Terraform, containerized services) and transform exploratory AI proof‑of‑concepts into hardened, reusable patterns adopted across product domains.
• Own platform cost‑efficiency and scalability while preserving the performance and accuracy that experiments and end users require.
• Explore and template agent design and deployment patterns, and set technical standards, code quality, and architectural direction for the platform.
• Partner across teams (modeling, agent, and product) to align integration points, dependency timelines, and delivery, and mentor engineers and scientists.

Professional Experience & Qualifications

• B.S. or M.S. in Computer Science, Engineering, or a related field, with 10+ years of professional software development experience.
• Demonstrated track record architecting and maintaining large‑scale distributed systems in production at technology companies.
• Deep expertise in workflow orchestration and event‑driven architecture, including stateful execution, idempotency, durable retries, and replay.
• Strong cloud‑native engineering on AWS with infrastructure‑as‑code, containerization, and autoscaling.
• Proven ability to take systems from prototype to hardened, observable, operationally excellent production.
• Experience designing SDKs, APIs, and data contracts that serve multiple downstream teams.
• Excellent communication skills and the ability to build organizational consensus around platform decisions.
• Collaborative and empathetic working style: listens to understand the needs of scientists, engineers, and downstream teams, and leads through influence.
• Proven track record setting technical strategy and direction for a growing engineering organization, and mentoring engineers in a fast‑moving environment.

Preferred Qualifications

• Hands‑on experience with agentic AI and orchestration frameworks (e.g., Pydantic AI, LangGraph, LangChain, CrewAI, AutoGen).
• Experience integrating LLMs and model platforms, including Anthropic, OpenAI, Vertex AI, and Amazon Bedrock, and building evaluation and feedback‑loop frameworks for agentic systems.
• Familiarity with sandboxed code execution and agent harness development.
• Experience with LLM observability, monitoring tooling, and cost‑governance / FinOps for AI infrastructure.
• Background in scientific domains such as biology, chemistry, or complex systems (a plus, not required).

Why Join Us

• Own the platform foundation for a category‑defining autonomous scientific reasoning engine.
• Take frontier agentic AI from research to dependable production at scale.
• Collaborate with visionary thinkers and top‑tier researchers across Flagship’s ecosystem.
• Set the technical standards that the broader platform and product teams build on.
• Shape the future of AI‑powered discovery in a role that combines deep engineering excellence with direct human‑health impact.

EEO Statement

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.

Salary and Benefits

The salary range for this role is $188,000 – $257,500, depending on qualifications, skills, competencies, and experience. Compensation and benefits include healthcare coverage, an annual incentive program, retirement benefits, and additional benefits. Compensation is based on a good faith estimate as of the date of publication and may be modified in the future.