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SysGuru™

Case Study • AWS Microservices • Payments & KYC • React Native

Projects & Case Studies — NNAKKI featured

From concept to production, SysGuru™ designed and built a secure, resilient platform for bookings, payments, provider onboarding and chat—optimised for the African market.

Overview

NNAKKI connects customers with beauty professionals. The platform supports discovery, booking, payments, provider onboarding (KYC) and in-app messaging, with admin oversight and audit trails.

  • Multi-service architecture: User, Payments, Calendar, Catalogue.
  • Role-based access (guest, customer, provider, admin).
  • Secure document uploads to S3 with signed read URLs.
  • Email/SMS notifications and moderation workflows.

Outcomes

  • Fast booking flow with calendar availability & conflict checks.
  • Automated payment splitting and provider payouts.
  • Reduced fraud exposure via KYC and webhook verification.
  • Operational visibility with structured logs & metrics.
Launched pilot in South Africa
Architecture
AWS reference architecture showing users connecting through Amazon S3 and CloudFront to API Gateway, Lambda and ECS, RDS and DynamoDB, with SQS, SNS, CloudWatch, OpenTelemetry, IAM, WAF, KMS, signed URLs and CI/CD services.
SysGuru AWS reference implementation for secure, scalable web, mobile, microservice and event-driven workloads.

Bookings & Calendar

Double-booking prevention, rescheduling, status transitions (PENDING, BOOKED, COMPLETED, DISPUTED) and reminders.

Payments & Payouts

Paystack sub-accounts, split charges, refunds and webhooks. Admin approvals and payout records for audit.

KYC & Documents

Secure uploads to S3, signed read URLs for preview, email notifications and admin review queues.

Chat

Booking-specific chat windows, provider and client roles, and the ability for administrators to assist and enforce guidelines.

Observability

Correlation IDs, structured logs, dashboards and alerts for errors, latency and payment exceptions.

Mobile-first UX

React Native application with web support, image tiles, modals and accessible forms for onboarding and booking.

Tech stack

Selected components

  • Back-end: Java Spring Boot microservices (User, Payments, Calendar, Catalogue)
  • Front end: React Native for mobile and web, with role-based routing and modals
  • AWS: API Gateway, Lambda/ECS, S3 (signed URLs), RDS/DynamoDB, SQS/SNS, CloudWatch
  • Payments: Paystack (sub-accounts, split payments, webhooks, payouts)
  • Security: IAM, WAF, KMS, OAuth/JWT, audit logs, least privilege
  • Tooling: GitHub Actions CI/CD, Infrastructure as Code where applicable

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