Software Engineer Fullstack

The Software Engineer - Fullstack plays a key role in building and scaling KAST. This is a high-ownership position where you’ll take responsibility for meaningful work from day one, collaborate closely with cross-functional teams, and help turn ambitious goals into real-world outcomes. Your mission is to move fast and raise the bar. You’ll operate in a dynamic, high-growth environment, navigate ambiguity with confidence, and contribute to systems, products, or processes that scale with the company. Quality matters, speed matters, and ownership is non-negotiable. This role is for builders, people who take initiative, think in systems, and care deeply about doing great work. If you’re excited about working at the intersection of technology, execution, and impact, you’ll feel right at home at KAST. Application Deadline June 24, 2026 Department Engineering Employment Type Full Time Location Colombo Workplace type Hybrid Responsibilities Design and develop back-end components for services using technologies such as Go, Node.js, or Python. Build and maintain RESTful APIs, microservices, and integrations with third-party services. Write performant, maintainable code following best practices in software design. Participate actively in code reviews, providing and receiving constructive feedback. Troubleshoot and resolve technical issues independently. Deploy, scale, and manage applications using cloud platforms like AWS or Google Cloud (GCP). Write and maintain unit and integration tests to ensure application reliability. Collaborate with product and design teams to translate requirements into technical implementations. Maintain technical documentation for developed features and services. Identify and implement improvements to existing backend services and processes. Qualifications & Skills 2–3 years of experience in full-stack or backend-focused development. Proficient in at least one backend technology such as Go, Python, or Java. Experience with modern web technologies and frameworks such as React.js or Next.js is a plus. Solid understanding of RESTful APIs, microservices architecture, and third-party integrations. Experience with relational (e.g., MySQL, PostgreSQL) and/or NoSQL (e.g., MongoDB) databases. Working experience with cloud platforms like AWS or GCP. Experience with Git and modern version control workflows. Familiarity with CI/CD pipelines and automated testing. Understanding of application security fundamentals. Experience with Agile methodologies, including Scrum or Kanban. Bonus Skills: Experience with blockchain development or Web3 technologies. Familiarity with serverless architecture (e.g., AWS Lambda, GCP Cloud Functions). Exposure to GraphQL APIs. Experience with containerization and orchestration (Docker, Kubernetes). AI-first development practices. About KAST KAST is redefining stablecoin banking for global citizens, crypto professionals, Web3-native businesses, and high-inflation markets hungry for USD-backed banking. Backed by top-tier global investors and led by the ex-APAC CEO of Circle, our leadership team spans Circle, Airwallex, Revolut, Wise, Grab, Zoom, AWS, and leading OTC desks. We’ve scaled from zero to nearly a million users at ridiculous speed. Apply Now Our Hiring Process Stage 1:First Technical Interview Stage 2:Second Technical Interview Find out more Not quite right? Register your interest to be notified of any roles that come along that meet your criteria. Register Your Interest