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.