GM Gathiira Mwangi
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Gathiira Mwangi

Backend Engineer, Reactive Event-Driven Financial Systems

I build reliable, high-throughput services for financial platforms: reactive microservices in Java and Spring WebFlux, event-driven APIs on Kafka and RabbitMQ, designed for idempotency and fault tolerance.

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GitHub activity
Weekly GitHub contribution activity over the last 12 months
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Professional Skills

Core languages, frameworks and infrastructure I reach for daily.

Languages & Runtime
Java Kotlin Python TypeScript
Frameworks & APIs
Spring Boot Spring WebFlux Django Rest Framework Next.js
Messaging & Data
Kafka RabbitMQ PostgreSQL MongoDB Redis gRPC
Cloud & Platform
Docker Kubernetes AWS Azure Digital Ocean Nginx Git OAuth 2.0 Firebase Unix Tailwind CSS
Career

Work Experience

A timeline of the teams and problems I've worked on.

Paycloud Africa
Software Engineer
Jan 2024 - Present · Full-time
JavaSpring BootNext.jsUmiJsGit
  • Design and maintain Java (Spring Boot) microservices powering the Banking App (app.paycloudafrica.com) and Merchant Platform (myduka.ke).
  • Integrate with Choice Bank APIs to enable secure and efficient digital payments.
  • Architect backend services supporting digital banking, merchant onboarding, KYC workflows, wallet operations, and payment processing.
  • Contribute to frontend development using Next.js, delivering responsive, user-friendly interfaces for onboarding and transactions.
Paycloud Banking System
Payments and banking reimagined, for Africa.
Stack: Java, Spring Boot, Next.js
myduka
Store management and digital payments for small businesses in Africa.
Stack: Java, Spring Boot, Next.js
Feb 2025 - Sept 2025 · Contract
KotlinSpring BootOdooSAPDaraja APIsGit
  • Designed and implemented ERP integrations (Odoo & SAP) to unify order placement, automate sales logistics, streamline inventory management, and digitize payment collection via M-Pesa.
  • Integrated with Tanzania Revenue Authority (TRA) via Advatech for tax compliant receipts.
  • Introduced a cashless payment collection module, reducing reliance on manual cash handling, improving transaction reliability, and accelerating reconciliation.
  • Enhanced operational efficiency by reducing reconciliation errors and providing real-time visibility across sales and inventory.
LipaLater
Software Engineer
Feb 2022 - Nov 2024 · Full-time
JavaSpring BootMySQLNext.jsTypeScriptFirebase
  • Architected, built, evaluated, and sustained software solutions for Sky.Garden.
  • Designed, developed, tested, and maintained software applications and systems that facilitate user management, loan allocation, and servicing.
  • Improved the user interface and experience for internal users, such as credit officers and customer service representatives.
  • Developed and maintained customer-facing applications, such as the online loan application portal, to enhance the borrower's experience.
  • Designed and maintained APIs for internal and external use, allowing data exchange and integration with partners and third-party platforms.
  • Identified and addressed software defects and issues to ensure smooth operations.
  • Participated in code reviews to ensure the quality, security, and maintainability of the software.
  • Identified opportunities for process improvement and efficiency, and worked to implement those changes.
Konza Silicon Company Limited
Backend Developer
Sept 2020 - Feb 2022 · Full-time
PythonDjangoDjango Rest FrameworkPostgreSQLDevOpsGit
  • Developed consumable REST APIs as per the BPMN using Python and Django REST Framework.
  • Developed and maintained an Nginx webserver gateway to support load balancing, reverse proxy, and HTTP caching.
  • Adapted REST APIs to match changing user preferences and client demands with regular updates.
  • Developed and managed internal and external system integrations.
  • Conducted unit tests, code reviews, code refactoring, and documentation.
Ardhisasa
An online platform allowing citizens, stakeholders and interested parties to interact with land information and processes held by Government.
Role: Backend Developer · Stack: Python, Django, Nginx, PostgreSQL
Improved accessibility for landowners and streamlined land rent payments across Kenya.
Directorate of Veterinary Services
Application Developer
Jan 2020 - Aug 2020 · Contract
FlaskSQLAlchemyPostgreSQLGit
  • Built product deliverables according to specifications and escalated technical design or specification issues.
  • Identified limitations, capabilities and performance requirements of software designs with pre-development assessments.
  • Resolved errors through close collaboration with the quality assurance team.
  • Determined feasibility of proposed designs within time and cost constraints.
Projects

Portfolio

A selection of personal and side projects.

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Stack: Next.js, Tailwind CSS, TypeScript, Prisma/PostgreSQL, shadcn/ui

Articles

Education & Certification

Bsc. Mathematics & Computer Science
Jomo Kenyatta University of Agriculture and Technology
2014 - 2019
20% of my programming knowledge comes from university, and 80% comes from the internet, books, personal projects and work experience.

Get in Touch

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I can help with the following:

  • Architecting resilient, event-driven backend systems in Java/Kotlin (Spring Boot, WebFlux), Python/Django and Next.js
  • Designing microservice and messaging infrastructure with Kafka/RabbitMQ, containerized and orchestrated on Docker and Kubernetes
  • Auditing and hardening existing platforms for reliability, performance and security
  • Technical leadership — code review, mentorship and CI/CD process improvement across cross-functional teams

Drop me a line at gathiiramwangi@gmail.com