Fullstack Engineer - Crypto Custody & Microservices

BlockchainHQ; United States; Remote; USD 140,000 - 180,000; Full time

Job summary

Payward is building the next generation of crypto custody platforms and digital asset services. This role focuses on secure backend development, scalable APIs, and real-time data flows within a globally distributed team.

You will contribute to custody, staking, and wallet services, while collaborating with product managers, architects, and DevOps to ship high-performance systems. Join a mission-driven group advancing open finance.

Qualifications

• 3+ years of professional experience in fullstack or backend engineering.
• Expert-level proficiency in Node.js and TypeScript.
• Deep understanding of microservices, event-driven architectures, and CQRS/DDD design patterns.
• Proven ability to design and deliver RESTful APIs and asynchronous event-based communication systems.
• Strong experience with SQL databases and schema design for performance and reliability.
• Solid understanding of React and modern frontend best practices.
• Deep knowledge of state management (React Query, Context API, custom hooks).
• Experience with Next.js, Tailwind CSS, and component-driven architecture.
• Hands-on experience with Docker, CI/CD, and observability tools such as Prometheus and Splunk.
• Excellent collaboration and communication skills — capable of working effectively in distributed, cross-functional teams.

Responsibilities

• Collaborate with product managers, architects, and DevOps engineers to design and deliver secure, scalable, and high-performance custody solutions.
• Build and maintain new backend microservices in TypeScript, Node.js, powering custody, staking, and wallet services.
• Integrate with blockchain networks and external systems to support asset movements, transactions, and key management workflows.
• Contribute to frontend applications built with React and Next.js, ensuring clear operational visibility and seamless user experience.
• Develop event-driven systems using Kafka for real-time data processing and inter-service communication.
• Write reusable, testable, and efficient code, maintaining high standards for performance, observability, and fault tolerance.
• Collaborate across teams to design and optimize data models, APIs, and distributed architectures.
• Participate in technical reviews, mentor other engineers, and take ownership of services throughout their full lifecycle - from RFCs and design to deployment and maintenance.

Skills

Node.js

TypeScript

NestJS

Microservices

Event-driven architecture

REST APIs

SQL databases

React

React Query

Next.js

Tailwind CSS

Docker

CI/CD

Observability

Distributed teams

Tools

Kafka

Prometheus

Splunk

CI/CD pipelines

Job description

Payward is building the next generation of crypto custody platforms and digital asset services. This role focuses on secure backend development, scalable APIs, and real-time data flows within a globally distributed team.

You will contribute to custody, staking, and wallet services, while collaborating with product managers, architects, and DevOps to ship high-performance systems. Join a mission-driven group advancing open finance.