Full Stack Developer (Fintech)
Optimal Growth Technologies
Date: 8 hours ago
City: Midrand, Gauteng
Contract type: Contractor
Role title: Full Stack Developer (Fintech Systems)
Location: Midrand
Contract duration: 12 months
Key Responsibilities
Application Development & Engineering Excellence
Backend Development & Architecture
Location: Midrand
Contract duration: 12 months
Key Responsibilities
Application Development & Engineering Excellence
- Design, implement, and maintain secure, scalable microservices using Java (Spring Boot), Python, and/or C#.
- Build responsive and reusable frontend components using React, Angular, or Vue.js, aligned with UX/UI best practices.
- Implement asynchronous event handling, messaging queues, and API orchestration for end-to-end flows.
- Write clean, maintainable, and well-documented code with strong unit and integration test coverage.
- Champion modern engineering frameworks such as Microsoft Engineering Playbook.
- Customize and extend open-source core banking platforms like Apache Fineract to support lending, wallets, savings, and payment use cases.
- Integrate with mobile money, card networks, KYC/AML, credit scoring, and regulatory reporting APIs.
- Build and expose financial APIs following open banking and ISO 20022 standards.
- Develop adapters and abstraction layers to bridge legacy banking systems and modern services.
- Drive implementation of CI/CD pipelines using Jenkins, GitLab, SonarQube, JMeter, and GitOps workflows.
- Embed security controls, Telemetry and static/dynamic analysis into the development lifecycle as part of DevSecOps culture.
- Contribute to Agile ceremonies sprint planning, backlog grooming, retrospectives and act as a technical voice in estimation and prioritization.
- Guide technical solution design, aligning with enterprise architecture and standardized engineering frameworks.
- Establish and evolve reusable architectural patterns for APIs, data flows, authentication, and service communication.
- Perform code and design reviews to enforce adherence to engineering standards, performance benchmarks, and security best practices.
- Contribute to platform-wide engineering initiatives such as shared libraries, code generation tools, and build system improvements.
- Enforce code quality through static analysis, code coverage thresholds, and continuous improvement of development standards.
- Maintain clear and up-to-date technical documentation across services, interfaces, and platform configurations.
- Collaborate with QA and security teams to ensure rigorous testing and secure release cycles.
- Participate in production support, incident resolution, and root cause analysis to uphold platform resilience.
- Track and resolve technical debt and prioritize refactoring efforts during regular engineering cycles.
Backend Development & Architecture
- 6+ years of hands-on experience designing and building production-grade backend systems in Java (Spring Boot), with additional proficiency in Python or C# for service-oriented and event-driven architectures.
- Advanced understanding of microservices patterns, including API gateway design, service mesh, circuit breakers, and distributed tracing.
- Expertise in modern JavaScript frameworks including React, Angular, or Vue.js, with strong command of component-based architecture, state management (e.g., Redux, Vuex), and responsive design.
- Experience implementing progressive web applications (PWAs) and web accessibility (WCAG) standards.
- Skilled in integrating frontend interfaces with backend APIs securely and efficiently, including token management and input validation.
- Proven track record customizing and integrating open-source core banking platforms such as Apache Fineract, or proprietary equivalents.
- Experience with financial services workflows like digital lending, wallet transfers, savings automation, and transaction reconciliation.
- Familiarity with ISO 20022, SWIFT, and open banking standards (e.g., PSD2 APIs).
- Proficient in building RESTful APIs, GraphQL endpoints, and gRPC services, with strong understanding of serialization (JSON, Protocol Buffers).
- Experience with event-driven systems, using Apache Kafka, RabbitMQ, or AWS SNS/SQS for decoupling and real-time data exchange.
- Familiarity with API security standards such as OAuth2, OpenID Connect, and mutual TLS authentication.
- Deep understanding of data modelling, schema design, and performance tuning for relational databases (MySQL, PostgreSQL).
- Experience with NoSQL technologies like MongoDB, Cassandra, or Redis for high-velocity or schema-less data.
- Strong command of DevSecOps practices, embedding security scanning and compliance checks throughout the SDLC.
- Skilled in CI/CD pipeline setup and management using Jenkins, GitLab CI, or GitHub Actions, with integrated tools like: SonarQube, Checkmarx, OWASP ZAP, Snyk, Fortify, Nexus, Artifactory
- Familiarity with GitOps workflows, Canary deployments, and blue/green strategies using ArgoCD or Flux.
- Experience deploying and operating applications on AWS, Azure, or Google Cloud, leveraging managed services (RDS, Cloud Functions, S3, IAM).
- Proficient with containerization using Docker, orchestration via Kubernetes, and secure Helm-based deployments.
- Setup and tuning of observability stacks including Prometheus, Grafana, ELK/EFK, and OpenTelemetry for metrics, logging, and tracing.
- Deep knowledge of secure coding standards, OWASP Top 10, and regulated data handling (e.g., PCI-DSS, GDPR).
- Experience implementing role-based access control (RBAC), JWT management, and audit logging.
- Proven ability to work within regulated fintech environments, ensuring systems meet audit, compliance, and risk controls.
- Bachelor's or Masters degree in Computer Science, Software Engineering, Information Systems, or a related field.
- Demonstrated success building and deploying financial solutions in regulated environments preferably involving digital wallets, savings, credit, or cross-border payments.
- Experience contributing to system and solution architecture design, technical decision-making, and adherence to enterprise engineering standards.
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