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Principal Full Stack Engineer at Phia | New York City

PhiaNew York City
On-site Full-time

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Experience Level

Senior

Qualifications

What You OwnLead engineering execution across frontend, backend, and infrastructure. Establish the technical direction and architecture in a fast-paced, zero-to-one setting. Build, manage, and expand high-performing full-stack engineering teams. Collaborate closely with Product and Design teams to transform concepts into high-quality, delivered products. Make critical engineering decisions in ambiguous scenarios and facilitate team progress to ensure sustained velocity. Set engineering standards, processes, and tools that foster rapid iteration and reliability. Balance immediate speed with long-term scalability, security, and maintainability. Remain actively engaged with the work—reviewing designs, guiding technical decisions, and mentoring emerging leaders. Take ownership of product outcomes and drive engineering excellence.

About the job

As a Principal Full Stack Engineer, you will take the helm of a talented team, spearheading the development of Phia's core product and platform from inception. You will oversee engineering execution across frontend, backend, and infrastructure, establishing the technical vision while scaling teams that prioritize speed and reliability in delivery. This is an active leadership role suited for an individual who excels in uncertain environments, collaborates closely with Product and Design, and skillfully balances speed, quality, and sustainable architecture. You will shape the engineering practices at Phia as we evolve from the ground up.

About Phia

Phia has successfully secured $35 million in funding from esteemed investors such as Notable Capital, Khosla Ventures, and Kleiner Perkins to develop the AI alignment layer for commerce. Within a year, Phia’s consumer shopping assistant has attracted over one million users and partnered with more than 6,200 retail brands, representing billions in annual gross merchandise volume. Each month, Phia generates millions in sales for its partners, achieving an impressive 11× revenue growth since its inception.

As AI vertical agents revolutionize various sectors, commerce is on the cusp of a significant transformation. Phia is redefining the shopping experience, shifting from a disjointed and impersonal process to one that is intelligent, trustworthy, and tailored to each user's needs. This foundation of trust positions us to become the all-in-one shopping destination for the next generation of consumers.

Phia operates with a lean, high-accountability team delivering at a rapid pace. If you are eager to push the boundaries of consumer AI and commerce while tackling complex challenges, this is the perfect environment for you.

About Phia

Phia is an innovative company focused on creating the AI alignment layer for commerce. With significant funding and rapid growth, Phia is transforming the shopping experience by making it intelligent, trustworthy, and user-centric. As a key player in the consumer AI space, we prioritize high-speed delivery and complex problem-solving.

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