I am a versatile tech professional with a passion for building practical tools, engaging websites, and intelligent data solutions. I create seamless software, uncover actionable insights from data, and design AI systems that solve real-world problems, delivering user-friendly, high-impact results.

Julius Matheka Charles

I am a versatile tech professional with a passion for building practical tools, engaging websites, and intelligent data solutions. I create seamless software, uncover actionable insights from data, and design AI systems that solve real-world problems, delivering user-friendly, high-impact results.

Available to hire

I am a versatile tech professional with a passion for building practical tools, engaging websites, and intelligent data solutions.

I create seamless software, uncover actionable insights from data, and design AI systems that solve real-world problems, delivering user-friendly, high-impact results.

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Experience Level

Expert
Expert
Expert
Expert
Expert
Expert
Expert
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
Intermediate
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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
Professional Certification – Software Engineering at ALX Africa
January 1, 2024 - February 1, 2025
Professional Certification – Data Science at Moringa School
January 1, 2023 - November 1, 2023
B.Sc. Disaster Management and International Diplomacy at Masinde Muliro University
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
Getting Started with Data Warehousing and BI Analytics
January 11, 2030 - April 30, 2026
Hands-on Introduction to Linux Commands and Shell Scripting
January 11, 2030 - April 30, 2026
ETL and Data Pipelines with Shell, Airflow, and Kafka
January 11, 2030 - April 30, 2026

Industry Experience

Software & Internet, Professional Services, Education, Media & Entertainment, Other
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