CW

Open to opportunities

Caleb Wafula

@calebwafula

Senior software engineer building cloud-native fintech and distributed systems with end-to-end feature ownership.

What I'm looking for

I’m looking for mission-driven teams where I can own end-to-end backend and payments features—building reliable distributed systems on AWS, with strong observability, automation, and a collaborative, remote-friendly culture.

I’m a Senior Software Engineer with 7+ years building production-grade systems across fintech, IoT, and SaaS platforms, with hands-on experience in payment rails, high-volume transaction processing, and cloud-native backend architecture. I’m proven at owning features end-to-end—from architecture through deployment, monitoring, and incident response—and I bring a collaborative mindset across product, ops, and data teams.

Most recently at Polariks, I owned full-stack development for a platform surfacing real-time data from 1,000+ IoT devices at 99.9% uptime, built PostgreSQL/InfluxDB models with Redis caching, and created observability from the ground up. At Digital Sacco, I integrated the M-PESA API with real-time transaction state tracking and reduced payment failure rates by 25%, while also cutting deployment time by 60% and introducing TDD to reduce production bug reports by 30%. I’m especially motivated by mission-driven work—building financial infrastructure for underserved communities in East Africa—because it turns distributed systems and payments engineering into real impact.

Experience

Work history, roles, and key accomplishments

ET

Senior Full-Stack Engineer

Enaton Tech

Mar 2022 - Jul 2022 (4 months)

Architected and delivered a multi-tenant SaaS platform from 0→1 in under 5 months, serving 50+ institutions and 10,000+ concurrent users. Reduced PostgreSQL query times by 50% and helped achieve LCP under 2.5s via SSR, while leading a remote team of 6 engineers to ship 4 major releases with zero critical production bugs.

React Next.js PostgreSQL Kubernetes C++

ET

Project Lead Full Stack

Enaton Tech

Mar 2022 - Jul 2022 (4 months)

Architected and delivered a 0-to-1 multi-tenant SaaS using Next.js SSR, Node.js, and PostgreSQL, serving 50+ institutions and 10,000+ concurrent users within 5 months. Reduced PostgreSQL query times by 50% using indexing and data modeling while leading a remote team of 6 engineers.

Next.js React TypeScript PostgreSQL AWS Docker Multi Tenant SaaS Models

OL

Software Engineering Intern

Onfon Media Limited

Jan 2018 - Nov 2018 (10 months)

Built internal automation tools reducing manual data entry by 50% and contributed to legacy system modernisation, improving response time by 25%.

Automation Tools Workflow Optimization Legacy System Modernization Performance Improvement Internal Tooling Development

Education

Degrees, certifications, and relevant coursework

JT

Jomo Kenyatta University of Agriculture and Technology

Bachelor of Science (BSc), Business & Information Technology

Earned a BSc in Business & Information Technology from Jomo Kenyatta University of Agriculture and Technology.

EI

eMobilis Mobile Technology Institute

Diploma, Software Development

Completed a Diploma in Software Development at eMobilis Mobile Technology Institute.

CL

CyberWarfare Labs

Certified Cyber Security Analyst, Cyber Security

Certified Cyber Security Analyst (completed in October 2024) through CyberWarfare Labs.

AU

APISEC University

API Security Fundamentals, API Security

Completed API Security Fundamentals (completed in October 2024) via APISEC University.

JT

Jomo Kenyatta University of Agriculture and Technology

Bachelor of Science, Business & Information Technology

Completed a BSc in Business & Information Technology at Jomo Kenyatta University of Agriculture and Technology (JKUAT).

Availability

Open to opportunities

Location

Kenya

Authorized to work in

Skills

M Pesa API Integration Node TypeScript Python C++.NET REST APIs GraphQL Microservices Serverless AWS Lambda Event Driven Architecture Async Processing Pipelines PostgreSQL Redis MongoDB MySQL InfluxDB Schema Design Indexing Stored Procedures AWS EC2 AWS S3 AWS RDS AWS IAM Docker Kubernetes Terraform CI CD Pipelines GitHub Actions Gitlab CI Structured Logging Systems Metrics Alerting Performance Profiling Incident Response React Angular Next.js Jest Cypress React Testing Library TDD Unit Testing Integration Testing E2E Testing Kafka LangGraph LLMs (LangChain OpenAI Anthropic OpenTelemetry Claude Code Cursor GitHub Gitlab Gmail Payment Rails Remote Team S3 Lambda NodeJS Lang Chain TailwindCSS Javascript (ES6)HTML5 CSS3 Tailwind UI Redux Tanstack Query Zustand MobX JavaScript (Node.Js NestJS Custom Authentication Backends JWT OAuth Data Modelling AWS Azure Debugging Git API Integration WebSockets SSE Serverless Architecture Agile Scrum Jira Code Review Technical Documentation Mentoring Remote Collaboration Cross Functional Collaboration Webpack Module Federation ES6 Figma JavaScript React Query Webpack Remote

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