Senior Fullstack Engineer

A rapidly growing fintech company at the intersection of digital assets, payments, and financial infrastructure is seeking a Senior Full-Stack Engineer to help build secure, scalable products that enable the next generation of global financial applications.

The company provides infrastructure used by financial institutions, fintechs, and technology companies to facilitate digital asset operations, payments, and wallet-based experiences. Their platform enables developers to seamlessly integrate embedded wallet functionality, authentication, and payment capabilities into modern applications.

With tens of millions of wallets already onboarded, the team is focused on building highly secure, reliable, and developer-friendly infrastructure while delivering exceptional end-user experiences.

About the Team

The engineering team develops and maintains developer-focused SDKs, APIs, and wallet infrastructure that power applications across fintech, payments, and digital assets.

Engineers work closely with Product and Design in a fast-paced, collaborative environment, tackling challenges related to security, scalability, reliability, and developer experience. The team values ownership, technical excellence, and customer-centric problem solving.

Responsibilities

• Design and implement modern frontend applications and scalable backend services.
• Own features end-to-end, from architecture and technical design through deployment and optimization.
• Build and maintain APIs and backend services supporting authentication, wallet functionality, and payment workflows.
• Develop user-facing experiences and developer tooling.
• Collaborate with cross-functional teams to deliver impactful product features.
• Improve platform performance, reliability, scalability, and security.
• Contribute to engineering best practices through code reviews, testing, documentation, and mentorship.

• Proven experience building and scaling production-grade software systems.
• Strong full-stack engineering background with ownership of complex products and technical initiatives.
• Ability to make architectural decisions while balancing scalability, security, reliability, and developer experience.
• Experience leading large, ambiguous projects and translating them into actionable technical plans.
• Strong systems-thinking and problem-solving skills.
• Experience establishing engineering best practices and maintaining high code quality standards.
• Track record of mentoring engineers and contributing to team growth.
• Ability to work independently while collaborating effectively across engineering, product, and design teams., * Experience with blockchain technologies, digital asset infrastructure, or wallet systems.
• Experience working with EVM-compatible chains and on-chain integrations.
• Solidity and smart contract development experience.
• Knowledge of smart contract security, testing, and maintenance.
• Experience with React and state management solutions in large-scale applications.
• Background in security-focused products or other highly regulated, high-sensitivity environments.