Full Stack Engineer

About the Role

We are looking for a Senior Full Stack Engineer with strong backend expertise and solid frontend capabilities to help build and scale our payment platform.

This role is approximately 70% backend and 30% frontend, making it ideal for engineers who enjoy designing scalable systems, APIs, and services while also contributing to modern, user-centric web applications.

You will work within cross-functional agile teams alongside Product Managers, Designers, Architects, and Engineers to deliver secure, scalable, and high-performance solutions that power payment experiences for merchants globally.

As a Senior Full Stack Engineer, you will be responsible for designing, developing, testing, and maintaining both backend services and frontend applications while ensuring adherence to engineering standards, architectural principles, and best practices.

Key Responsibilities

Backend

• Design, develop, and maintain scalable backend services using C# and .NET Core
• Build and enhance RESTful APIs and microservices supporting payment processing and merchant platforms
• Apply SOLID principles, design patterns, and clean architecture practices
• Write clean, maintainable, and testable code with comprehensive unit and integration tests
• Optimize application performance, reliability, and scalability
• Participate in technical design discussions and architectural decisions
• Collaborate with Technical Project Managers on planning, estimation, and risk management
• Support CI/CD pipelines, build automation, and deployment processes
• Troubleshoot and resolve complex production issues

Frontend

• Develop responsive, secure, and high-performance web applications using React (preferred), Angular, or modern JavaScript frameworks
• Collaborate closely with Product and Design teams to deliver intuitive user experiences
• Build reusable UI components and contribute to frontend architecture and design systems
• Integrate frontend applications with backend APIs and real-time transaction data
• Optimize applications for usability, accessibility, and performance across devices
• Participate in code reviews and drive frontend engineering best practices

Team & Delivery

• Participate in Agile ceremonies including sprint planning, standups, demos, and retrospectives
• Contribute to technical documentation and engineering standards
• Collaborate effectively with cross-functional teams across multiple locations
• Mentor junior engineers and promote engineering excellence across the team
• Continuously identify opportunities to simplify systems, improve quality, and accelerate delivery

What We're Looking For

Required Skills & Experience

• 6+ years of professional software engineering experience
• Strong hands-on experience with C# and .NET Core
• Experience designing and building REST APIs and distributed systems
• Strong understanding of SOLID principles, design patterns, and software architecture
• Experience with SQL Server and relational database design
• Strong proficiency in JavaScript/TypeScript, HTML5, and CSS3
• Commercial experience with React (preferred) or Angular
• Experience integrating frontend applications with backend APIs
• Experience with Git, BitBucket, JIRA, and Agile delivery methodologies
• Strong debugging, analytical, and problem-solving skills
• Experience with automated testing and TDD practices
• Bachelor's degree in Computer Science or equivalent practical experience

Nice to Have

• Experience within FinTech, payments, banking, or financial services
• Experience with cloud platforms (AWS, Azure, or GCP)
• Knowledge of WebSockets, GraphQL, or micro-frontend architectures
• Experience with Redux or other state management libraries
• Familiarity with Material UI, Tailwind CSS, or design systems
• Experience working in high-volume transactional environments
• Knowledge of CI/CD, containerization, and DevOps practices