Senior Product Manager – Partner Applications

KAST is redefining stablecoin banking for global citizens, crypto professionals, Web3-native businesses, and high-inflation markets hungry for USD-backed banking. Backed by top-tier global investors and led by the ex-APAC CEO of Circle, our leadership team spans Circle, Airwallex, Revolut, Wise, Grab, Zoom, AWS, and leading OTC desks. We’ve scaled from zero to nearly a million users at ridiculous speed.

By building directly on-chain, we will deliver what traditional rails can’t: instant yield, flexible collateralized lending, and richer investment products. With a premium user focus and a culture built on velocity × excellence, we’re moving fast to outpace legacy players and build the next generation of financial services.

Cards are at the heart of our today’s value proposition. They’re how users experience stablecoins in the real world – paying at 100M+ merchants globally, withdrawing at ATMs, and accessing new forms of credit. Our ambition is clear: make KAST the #1 stablecoin bank globally.

We’re hiring a Senior Product Manager – Partner Applications to build the connective tissue between KAST and the biggest players in the crypto world. You will own the strategy and execution of our partner-facing API product, creating a “light” integration that allows top-tier exchanges and wallets to seamlessly offer KAST’s card products to their users.

Your mission: design a simple, powerful, and secure set of APIs that unlocks massive user growth and transaction volume. You will enable partners to embed core KAST features within their own apps, while ensuring KAST maintains the direct user relationship, brand experience, and high standard of service that sets us apart.

At KAST, ideas are worth zero. Execution at ridiculous speed is everything. This is a role for a deeply technical builder who can translate complex partner requirements into elegant API specs and ship world-class developer tools.

• Design and ship the KAST Partner API suite from the ground up, enabling features like SSO, balance queries, transaction history, and card status retrieval.
• Develop a streamlined KYC/AML process by defining the integration for ingesting partner identity tokens (e.g., Sumsub).
• Write crystal-clear, detailed API specifications and work hand-in-hand with a dedicated engineering team to manage the development lifecycle.
• Create excellent developer documentation and support materials to ensure a frictionless integration experience for our partners.
• Partner with our Crypto Partnerships lead to engage directly with exchanges, understand their technical and user experience needs, and translate them into a prioritized roadmap.
• Define the product-level security and authentication model for our B2B services, ensuring our systems are robust and trusted.‍
• Set and track KPIs laser-focused on the ultimate goal: maximizing end-user transaction volume driven through our partner network.

• 5-8+ years in product management, with a significant portion in a highly technical, API-first, or B2B product role.
• Proven experience shipping API-first products. You are comfortable writing detailed API specifications, debating system architecture with engineers, and managing complex technical integrations.
• Deep knowledge of identity and authentication systems, including SSO, OAuth, and the secure handling of user credentials.
• Experience in fintech, crypto, or payments infrastructure is strongly preferred. You understand the nuances of moving and displaying financial data.
• A balance of technical depth and partner empathy. You can command the respect of the engineering team while effectively communicating with external commercial and product counterparts.
• Entrepreneurial mindset: you live and breathe building API products, obsess over developer experience, and build like a founder.

• Build the Centurion of crypto cards – the most aspirational product in stablecoin banking.
• High ownership, zero bureaucracy, and direct impact.
• Work with a world-class team across crypto, payments, and fintech.
• Competitive comp + meaningful equity.
• Join a no-BS, high-energy team on track to be the next unicorn.

Referrals only. Find your way in.

• Ask someone from the KAST team to vouch for you.
• Show us what you’ve built that proves you’re world-class.
• Or surprise us – the best builders always do.