Full Stack Developer

Full Stack Developer – Unbank (Kalbas Inc.)

Boynton Beach, FL | In-house
Full-Time | Mid-Senior Level
React.js | Node.js | API Integration | Crypto & Fintech

About Us: 

Unbank, powered by Kalbas Inc., is revolutionizing access to Bitcoin and digital assets across the U.S. Through our mobile app and extensive retail partner network—including CVS, Office Depot, and Love’s—users can buy or sell crypto using cash or card, anytime. We're a mission-driven fintech company focused on decentralization and financial inclusion.

As a Full Stack Developer at Unbank, you’ll help build and scale our core application infrastructure. You’ll work across the frontend and backend, building powerful tools and interfaces to support our mobile app, crypto integrations, internal consoles, and customer-facing dashboards.

Responsibilities:

• Build, test, and maintain robust and scalable web applications in React.js and Laravel

• Develop and optimize RESTful APIs and backend services using Laravel and MySQL

• Leverage Laravel Livewire for dynamic, reactive interfaces where applicable

• Work closely with mobile engineers to integrate frontend and backend workflows

• Collaborate with Product, Compliance, and Ops teams to deliver secure, auditable financial features

• Support admin dashboards and internal tools used to manage our crypto ecosystem

• Ensure code quality, documentation, and deployment readiness

• Identify and fix bugs, performance bottlenecks, and security vulnerabilities

• Participate in code reviews, sprint planning, and CI/CD workflows
  
  What You'll Bring: 

• 3+ years of experience in full-stack development

• Proficient in JavaScript, React.js, Node.js, Express, and PostgreSQL/MongoDB

• Experience building APIs and integrating third-party services (e.g., Twilio, crypto APIs)

• Familiarity with cloud infrastructure (preferably DigitalOcean, AWS, or similar)

• Knowledge of authentication flows (OAuth, 2FA) and role-based access control

• Strong understanding of version control (Git) and Agile development

• Experience working in fintech, blockchain, or crypto environments is a major plus

• Excellent problem-solving, communication, and teamwork skills
  
  Nice-to-Haves:

• DevOps experience (Docker, CI/CD, Linux)

• Familiarity with crypto transaction workflows (e.g., Lightning Network, wallet management)

• Experience with WebSocket services and real-time data

• Security-first mindset with experience in PCI, SOC2, or similar environments