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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 — optimized 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 split and payout to providers.
  • Reduced fraud exposure via KYC and webhook verification.
  • Operational visibility with structured logs & metrics.
Launched pilot in South Africa
Architecture

AWS reference implementation

S3/CloudFront hosts the web app and asset delivery. API Gateway fronts Lambda/ECS services. Data spans RDS/DynamoDB with SQS/SNS events. Security via IAM, WAF, KMS and signed URLs. CI/CD via GitHub Actions.

S3 + CloudFront API Gateway Lambda/ECS RDS/DynamoDB IAM/KMS/WAF SQS/SNS CloudWatch OpenTelemetry

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-scoped chat windows, provider/client roles, admin ability to assist and enforce guidelines.

Observability

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

Mobile-first UX

React-Native app 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 (mobile + web), role-based routing & 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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