Fullstack Engineer

Weaver Fintech is a purpose-driven, data-centric FinTech company revolutionizing financial services for more than 3 million South Africans. We simplify financial journeys empowering customers to shop, lend, insure, and thrive. Our Data Engineering & Analytics team plays a critical role in building scalable, modern data solutions that drive innovation and enable data-driven decision-making across the business. Join us in a collaborative, high-growth environment where your work makes a real impact. Role Overview As a Senior Full-Stack Engineer, you'll help build and scale our fintech platform on AWS, owning secure, high-performance features for payments and marketplace operations that serve millions of transactions. You'll drive architectural choices, deliver event-driven serverless systems, take end-to-end ownership of features, and mentor the team in a fast-moving, high-impact environment. If you enjoy solving complex distributed problems at real financial scale and want to make a tangible difference, this is your role. Responsibilities Influence architectural decisions with a focus on security, scalability, reliability, and high availability across distributed systems Select and implement technologies that optimize for performance and cost efficiency, ensuring seamless scaling across PayJustNow services Design and ship scalable, event-driven, serverless systems on AWS, using clear API contracts between services Own the end-to-end development of features for fraud-resistant payment systems and high-throughput marketplace, ensuring they are well-designed, maintainable, and highly performant Develop and maintain observability systems, including monitoring, metrics, and alerting for complete visibility Mentor other engineers through pairing, knowledge sharing, and technical guidance to elevate the entire team’s capabilities Experience Hands-on experience developing applications on AWS using serverless components such as Lambda, API Gateway, DynamoDB, S3, and EventBridge/SQS/SNS Solid foundation in event-driven, serverless systems on AWS using CDK for infrastructure as code Strong experience building backends in Node.js / TypeScript that supported millions of monthly transactions. Experience building reusable components in React or Vue.js Competent profiling and optimizing serverless workloads at scale — cold-start mitigation, provisioned concurrency, memory/timeout tuning, cost/latency trade-offs — using tools like Lambda Power Tuning, X-Ray, CloudWatch Insights Proven track record shipping full-stack features across web and mobile Benefits Competitive, market-aligned salary for an intermediate-level data engineer. Performance-based bonuses. Flexible or remote work options. Professional development opportunities and training support. Comprehensive benefits package.