Principal Product Experience Engineer

Massive; Atlanta (GA); On-site; USD 120,000 - 180,000; Full time

Job summary

Massive is seeking a Product Engineer to help define how product development works in an AI-first world. This cross-functional role combines frontend engineering, product judgment, and UX sensibility, using AI as a core element in thinking, building, and iterating.

You'll work across problem framing, experience design, and implementation to deliver new user experiences end to end, with ownership and close collaboration with product, design, and QA to shape intent, quality, and direction.

Qualifications

• Proven frontend engineering track record with React and TypeScript.
• Ability to ship end-to-end frontend experiences with polish.
• Strong product judgment and UX sensibility.
• Experience using product analytics tools to define signals.
• Comfort with uncertain problems and ownership.

Responsibilities

• Own product initiatives from hypothesis to shipped experience.
• Use AI extensively to prototype and iterate UX ideas.
• Design and build complete user experiences from interaction to production frontend code.
• Start small bets and ship early versions to learn.
• Iterate based on real-world usage and feedback.
• Partner with product, design, and QA to clarify problems and maintain coherence.

Skills

Frontend engineering

React

TypeScript

UX design intuition

AI integration

Product judgment

Ownership and delivery

Analytics (PostHog/Amplitude)

Tools

PostHog

Amplitude

CSS/Accessibility

Frontend architecture

Job description

About The Role

We are looking for a Product Engineer to help define how product development works in an AI-first world.

This is a cross-functional role for someone who combines exceptional frontend engineering skill, strong product judgment, and a solid UX sensibility, and who uses AI as a core part of how they think, build, and iterate.

You will work across problem framing, experience design, and implementation to create new user experiences end to end. Rather than moving work through traditional product, design, and engineering phases, you will operate with a high degree of ownership while collaborating closely with product, design, and QA to shape intent, quality, and direction.

This role is about turning ideas into real, testable experiences quickly and learning from what happens next.

Responsibilities

• Own product initiatives from hypothesis to shipped experience, with clear intent and validation signals.
• Use AI extensively to accelerate prototyping, implementation, iteration, and exploration of UX ideas.
• Design and build complete user experiences, from interaction models to polished, production-ready frontend code.
• Start with small, explicit bets and ship early versions to learn and refine rather than over-planning upfront.
• Iterate based on real-world usage and feedback, deciding when to continue, adjust, or stop.
• Partner with product, design, and QA to clarify problems, define quality bars, and maintain coherence without heavy handoffs or queues.

Skills & Qualifications

• Exceptional frontend engineering skills with deep mastery of modern frontend development including React, TypeScript, modern CSS, browser APIs, performance, and accessibility.
• Proven ability to design and implement complex, high-quality interfaces with excellent interaction and polish.
• Strong architectural instincts for frontend systems that scale in complexity without becoming brittle.
• Comfort owning the frontend end to end, from initial prototype to long-lived production code.
• Strong product judgment with the ability to frame work as hypotheses and evaluate outcomes using real signals.
• Strong instincts around scope, sequencing, and tradeoffs.
• Practical UX sensibility—you can execute thoughtful UX without relying entirely on mocks.
• AI-native workflow where you already use AI tools meaningfully in your day-to-day work and treat AI as leverage for thinking and building.
• Ownership and follow-through—comfortable carrying work across definition, build, release, and evaluation.
• Experience using product analytics tools such as PostHog, Amplitude, or similar to define signals, evaluate bets, and guide iteration.
• Founder mentality with comfort making decisions under uncertainty and taking responsibility for outcomes.
• Experience working in fast-moving environments where direction is shaped through execution rather than detailed plans.
• Background in financial markets, market data, or data-intensive products is a plus.

About Massive

At Massive we are on a mission to help developers build the future of fintech. We are committed to democratizing access to the world's financial market data and enabling developers to build the future of fintech. Join us and be part of a team that is revolutionizing the way we interact with money and value.