Senior Software Engineer (Java)

At Coinme, we’re redefining access to financial services in a digital world. By combining the cutting-edge power of blockchain technology with everyday simplicity, we make digital currencies accessible and usable for all.

As the world's largest network of cryptocurrency kiosks with over 40,000 locations nationwide, we're breaking down barriers to crypto adoption through our seamless mobile app, secure digital wallet, and DeFi integrations. Beyond our consumer offerings, we're also the infrastructure powering the crypto revolution for businesses.

Through our enterprise Crypto-as-a-Service (CaaS) platform, we enable businesses to launch crypto capabilities in weeks, not months. Our modular, API-first infrastructure provides everything from KYC and payment processing to liquidity and custody solutions—all fully licensed and compliant.

We’re big enough to lead the charge in decentralized finance but small enough that your ideas will make waves. Every role at Coinme contributes to building a financial future where everyone has the tools to thrive. At Coinme, your growth fuels our mission. Together, we RISE.

Position Description:

As a Senior Software Engineer, your mission will be to enable Coinme and customers to manage their flow of funds by designing and developing scalable software solutions for handling crypto custody and blockchain transactions. You will accomplish this by working alongside your engineering team to build software and integrations for accepting, disseminating, and liquidating funds needed to fulfill customer transactions, including capabilities to custody, send and receive crypto funds. 

Responsibilities:

• Design solutions for complex technical and business problems
• Develop software systems and components for our rapidly growing business
• Write performant, maintainable code while iterating and shipping rapidly
• Work within our backend architecture and technology stack based on:
• Java 17 or higher with Project Reactor (Reactive Java)
• Spring Boot
• Command and Query Responsibility Separation (CQRS) architecture and Event Sourcing (ES)
• Full microservice environment
• RESTful APIs for synchronous flows
• Event-driven design (powered by CQRS and ES) for async flows
• Webhooks and Server-sent events
• Axon Framework for intra-domain event-driven design
• Kafka for inter-domain event-driven design
• Kubernetes, Helm charts, Argo platform
• MySQL DB
• Mongo DB
• AWS solutions (EC2, RDS, etc.)
• Author and maintain unit and integration tests
• Work with your Scrum team to plan sprints and delivery of features
• Drive engineering excellence, operational stability and security into all layers of the  platform
• Participate in design and architecture discussions and planning
• Drive the execution and delivery of features by collaborating with cross functional stakeholders
• Work with Engineering Leadership to drive best practices in software development, testing, and production operations
• Mentor other engineers, helping them grow in their careers
• Contribute to recruiting efforts to continue to build your team

Qualifications:

• Bachelor's degree in Computer Science, Software Engineering, or equivalent experience
• 5+ years of experience as a software developer
• Experience building scalable services and distributed systems in Java or similar object-oriented language
• Experience driving technical designs within a team
• Experience writing code that is readable, scalable, and instrumented
• Experience working in a fast-paced Agile development environment
• Experience in communicating with users, other technical teams, and product to understand requirements, describe software product features and technical designs
• Passion for cryptocurrency and blockchain technology
• Good understanding of blockchain technology, including cryptocurrency protocol knowledge with hands-on experience integrating multiple blockchain networks (Bitcoin, Ethereum, etc). Must understand UTXO vs account-based models, transaction lifecycle management, and gas optimization strategies
• Fireblocks (or similar custody provider) API integration experience with REST and webhook APIs for transaction management, vault operations, and policy engine configuration. Must understand callback mechanisms and transaction status workflows
• Required technology skills
• Java & Spring Boot expertise
• Experience with a microservice environment
• Kafka, RabbitMQ, ActiveMQ or similar tech
• RESTful APIs for synchronous flows
• MySQL DB
• Mongo DB or similar NoSql database
• Experience with Kubernetes or any cloud development platforms

Not Required, But Nice to Have:

• Experience working in the financial services industry 
• Experience or working knowledge of CQRS architecture and Event Sourcing concepts
• Experience with Event-driven design
• Reactive Java, Project Reactor
• Webhooks, Server-sent events, Websocket or any async notification technology
• Axon Framework 
• Experience with AWS solutions

This is a fully remote position. Must be willing to work some overlap between EST. English is our global team’s common language, so strong verbal and written communication skills in English are required.