Back End Developer
Wonnpay is a crypto-native payment network built for global citizens, high-value individuals, and mobile-first entrepreneurs. Our mission is to make transactions smarter, faster, and more secure by providing innovative payment solutions that streamline financial operations and empower businesses to grow.
Skills
About This Role
Company Description
Wonnpay is a crypto-native payment network built for global citizens, high-value individuals, and mobile-first entrepreneurs.
Our mission is to make transactions smarter, faster, and more secure by providing innovative payment solutions that streamline financial operations and empower businesses to grow.
Focused on adapting to the evolving needs of modern commerce, Wonnpay delivers scalable and efficient digital payment infrastructures.
Driven by technology and a commitment to trust, we help partners succeed in the rapidly changing world of finance.
Role Description
Backend Developer to manage and extend a production backend system built with Node.js and
NestJS.
The backend powers mobile applications involving authentication, financial
transactions, third-party integrations, and secure data processing.
This role requires strong backend fundamentals and careful handling of business-critical systems.
Responsibilities
include implementing software solutions, working with programming languages, ensuring database performance, and collaborating with front-end developers to integrate user-facing elements seamlessly.
You will also ensure code quality and actively troubleshoot production issues as they arise, contributing to scalable and robust software solutions.
Key Responsibilities
- Develop and maintain backend services using Node.js and NestJS
- Design and implement RESTful APIs
- Maintain authentication and authorization mechanisms
- Work with relational databases and ORM tools
- Design, update, and maintain database schemas and migrations
- Integrate and manage third-party services and APIs
- Ensure data consistency and reliability for transaction-based systems
- Handle error management, logging, and monitoring
- Support deployment and runtime issues in production
- Worked crypto/ wallet / card as a program project
- Work with AWS-based infrastructure
- Manage environment configurations and secrets securely
- Write and maintain unit and integration tests
- Use Git for version control and collaborate via pull requests
Preferred Skills and Experience
- Minimum 2+ years of backend development in crypto space
- Strong experience with Node.js and NestJS
- Proficiency in TypeScript
- Hands-on experience with ORMs (TypeORM or equivalent)
- Solid understanding of REST APIs and backend architecture
- Experience implementing authentication systems (JWT, tokens, etc.)
- Familiarity with AWS services and cloud deployments
- Understanding of production backend monitoring and debugging
- Proficiency with Git and collaborative development workflows
- Experience in fintech, payments, or financial systems
- Knowledge of third-party payment or KYC integrations
- Experience working with transaction-heavy or high-reliability systems
- Experience CI/CD pipelines and cloud infrastructure best practices
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