I am Julius Matheka Charles, a results-driven Software & Data Engineer with hands-on experience across the full data lifecycle — from pipeline design and SQL analytics to Python backend development and BI reporting. I excel at turning complex data into actionable business insights and building reliable, scalable systems. I have experience in both internship and junior professional roles, with a strong foundation in Agile delivery, cloud-native tools, and AI/ML integration. I thrive in collaborative teams and enjoy turning ideas into production-grade solutions.…

Julius Matheka Charles

I am Julius Matheka Charles, a results-driven Software & Data Engineer with hands-on experience across the full data lifecycle — from pipeline design and SQL analytics to Python backend development and BI reporting. I excel at turning complex data into actionable business insights and building reliable, scalable systems. I have experience in both internship and junior professional roles, with a strong foundation in Agile delivery, cloud-native tools, and AI/ML integration. I thrive in collaborative teams and enjoy turning ideas into production-grade solutions.…

Available to hire

I am Julius Matheka Charles, a results-driven Software & Data Engineer with hands-on experience across the full data lifecycle — from pipeline design and SQL analytics to Python backend development and BI reporting. I excel at turning complex data into actionable business insights and building reliable, scalable systems.

I have experience in both internship and junior professional roles, with a strong foundation in Agile delivery, cloud-native tools, and AI/ML integration. I thrive in collaborative teams and enjoy turning ideas into production-grade solutions.

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Skills

Experience Level

Python
Expert
SQL
Expert
Django
Expert
PostgreSQL
Expert
Docker
Expert
JavaScript
Expert
React JS
Expert
Java
Intermediate

Language

English
Fluent

Work Experience

Junior Python Developer at Paystack
August 1, 2024 - June 1, 2025
Built scalable Python backend services and data ingestion scripts for small business clients — automating data collection from APIs and CSV sources into PostgreSQL. Developed Django-based web applications with user authentication, role-based access, and data export functionality tailored to client reporting needs. Integrated LangChain and OpenAI APIs to add AI-powered features including document summarisation, semantic search, and automated content generation. Containerised applications with Docker and set up GitHub Actions CI/CD pipelines, enabling reliable deployments across client environments. Maintained 80%+ test coverage using pytest; resolved bugs and performance bottlenecks identified through production monitoring and client feedback.
Data Analyst Intern (SQL) at Windle International
January 1, 2023 - March 1, 2024
Wrote complex SQL queries across PostgreSQL databases to extract, clean, and analyse business datasets for weekly management reporting. Built and maintained ETL pipelines that pulled data from multiple source systems into a central data warehouse, reducing manual data preparation time by 35%. Created data quality checks using SQL (NULL validation, duplicate detection, row count reconciliation) to ensure pipeline integrity across all reporting tables. Collaborated with senior analysts to design dashboard-ready summary views and aggregation tables consumed by Power BI reports. Documented SQL query logic and pipeline steps, improving team knowledge sharing and onboarding efficiency.

Education

Professional Certification at ALX Africa
January 1, 2024 - February 1, 2025
Professional Certification at Moringa School
January 1, 2023 - November 1, 2023
B.Sc. at Masinde Muliro University
January 1, 2012 - January 1, 2016
B.Sc. Computer Science at Masinde Muliro University of Science & Technology
January 1, 2012 - January 1, 2016

Qualifications

ETL and Data Pipelines with Shell, Airflow, and Kafka
January 1, 2024 - April 21, 2026
Getting Started with Data Warehousing and BI Analytics
January 1, 2024 - April 21, 2026
Hands-on Introduction to Linux Commands and Shell Scripting
January 1, 2024 - April 21, 2026
ETL and Data Pipelines with Shell, Airflow & Kafka
January 1, 2024 - April 21, 2026
Data Warehousing and BI Analytics
January 1, 2024 - April 21, 2026
Linux Commands and Shell Scripting
January 1, 2024 - April 21, 2026
ALX Africa - Full-stack, algorithms, Django/React, Java/Spring Boot
January 1, 2024 - February 1, 2025
Moringa School - ML, ETL pipelines, Python, SQL, TensorFlow, Tableau
January 1, 2023 - November 1, 2023

Industry Experience

Software & Internet, Professional Services, Education
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