Senior Wallet Developer

NMK Global Inc. is a global IT Services & Solutions company specializing in IT Staffing, Technology Consulting, Workforce Solutions, and Application Development Services. We help organizations build high-performing technology teams by connecting them with exceptional talent across a wide range of industries. Our expertise, industry knowledge, and consultative approach enable clients to achieve successful business outcomes while helping professionals advance their careers. 

Job Description:

We are seeking a highly experienced Senior Wallet Developer to design, develop, and maintain secure and scalable wallet infrastructure for digital assets and financial systems.

The role involves backend development, wallet technology, custody integrations, real-time systems, infrastructure, and blockchain-related technologies. You will play a key role in building secure systems that enable the movement and protection of digital assets at scale.

Key Responsibilities:

• Design, develop, and implement secure wallet infrastructure and backend systems.
• Develop scalable backend services, APIs, and wallet applications using C#/.NET, Node.js, and TypeScript.
• Design transaction workflows and integrate with custody and wallet providers such as Fireblocks.
• Work with MPC-based wallet technologies and secure key-management solutions.
• Build and integrate REST APIs, gRPC, WebSockets, streaming, and event-driven services.
• Implement security-focused solutions for key management, access controls, cryptographic operations, and sensitive financial data.
• Participate in system architecture, software development, integration, testing, and deployment.
• Troubleshoot complex production issues and improve system reliability and performance.

Required Qualifications:

• Strong professional experience developing production-grade software.
• Advanced experience with C#/.NET, Node.js, TypeScript/JavaScript, or similar technologies.
• Strong experience developing and integrating:
  • REST APIs
  • gRPC
  • WebSockets
  • Streaming systems
  • Event-driven architectures
• Experience with modern cloud and deployment technologies such as:
  • AWS or Google Cloud Platform
  • Docker
  • Kubernetes
  • CI/CD
• Experience working in financial services, payments, trading, digital assets, or other security-sensitive environments.
• Strong understanding of secure software development and system integration.

Preferred Qualifications

• Experience with Multi-Party Computation (MPC) and MPC-based wallet architectures.
• Knowledge of cryptographic key management and digital asset custody infrastructure.
• Experience with wallet/custody platforms such as Fireblocks.
• Understanding of blockchain transaction flows, including:
  • Deposits
  • Withdrawals
  • Confirmations
  • Reconciliation

 

NMK Global Inc. is an Equal Opportunity Employer. We are committed to creating an inclusive workplace and consider all qualified applicants without regard to age, race, color, religion, sex, national origin, disability, protected veteran status, sexual orientation, gender identity, or any other characteristic protected by applicable law.