Senior Product Engineer

We're looking for a
Senior Product Engineer, Frontend
to join the team building
Zerion Wallet
.
In this role, you'll own product experiences end-to-end — from understanding the problem and shaping the interaction to implementation, launch, and iteration.
We're looking for someone who combines strong frontend engineering skills with product judgment and an unusually high bar for design and craft. We care not only about whether something works, but how it feels to use — and you should be comfortable challenging a solution when the experience isn't good enough.
We value strong ownership, attention to detail, and the ability to move fast without compromising product quality.
What You'll Do
Own complex product features
end-to-end
— from understanding the problem and shaping the solution through implementation, launch, and iteration.
Work closely with the product team to
shape what we build
, challenge assumptions, and turn ambiguous problems into great product experiences.
Build polished, responsive product experiences using
React and TypeScript
.
Prototype and iterate on interactions quickly, using code, design tools, and AI to find the right solution.
Obsess over the details that make interfaces feel great:
interaction, motion, responsiveness, loading states, transitions, and microinteractions
.
Build and evolve reusable frontend components and our
design system
, improving consistency without sacrificing flexibility.
Proactively identify places where the existing product experience can be improved — and take ownership of improving them.
Maintain a high bar for
performance, accessibility, reliability, and frontend engineering quality
.
What We're Looking For
5+ years of experience building high-quality, customer-facing web products.
Excellent knowledge of
React, TypeScript, modern CSS, and browser technologies
.
A track record of owning and shipping
complex product features end-to-end
, rather than working only on isolated components or implementation tasks.
Strong
product and UX judgment
— you can recognize when an interaction doesn't feel right and propose a better solution.
Exceptional attention to detail and a desire to build interfaces that feel polished, responsive, and intentional.
Experience building sophisticated
animations and interactive UI
.
Strong understanding of modern frontend engineering practices and the judgment to know when and how to apply them.
Comfortable taking an
ambiguous product problem and turning it into a concrete solution
.
Strong ownership mindset — you take responsibility for outcomes, not just tasks.
Strong desire to actively contribute to
product evolution
, not just implementation.
Comfortable operating in a
fast-paced startup environment
and working on multiple problems in parallel.
Clear and proactive communication in a
distributed team
.
Technical Skill Set
Excellent knowledge of
React and TypeScript
.
Strong command of
HTML, CSS, browser APIs, and modern frontend architecture
.
Experience building responsive, high-performance web applications.
Experience with
animation and interaction libraries
and building complex UI transitions.
Experience building reusable component systems and frontend abstractions.
Strong understanding of frontend performance, accessibility, and cross-browser behavior.
AI-native workflow
is your default for product exploration, implementation, debugging, and iteration.
Bonus Points
Experience building or evolving
design systems and component libraries
.
Strong
Figma skills
and the ability to explore interaction ideas independently before implementation.
Experience building highly interactive consumer applications where
performance and perceived performance
matter.
Experience with
Browser Extension
development.
Hands-on
Web3 experience
: wallets, dApps, blockchain interactions, or DeFi.
Prior experience in a startup environment that emphasizes
trust and autonomy
.
Located in time zones close to Europe for smoother collaboration.
Curiosity and willingness to challenge existing solutions when better ones exist.
Why You Should Join
Company Overview
Zerion API
Trusted by
50+
top crypto and fintech brands
Powering
2k+
active clients monthly
Over
10B
total requests processed
A
lean, senior AI-native team
shipping at outsized scale
Zerion Wallet
1.7M+
active funded wallets
27.6M+
transactions
2.5B+
transaction volume
416K+
unique holders of Zerion DNA NFT
Culture
: Our culture shines through in our strong team engagement and impressive retention, showing just how much we value creating a