Looks like you have JavaScript disabled. For the full Twine experience, you will need to re-enable it.

Hi, I’m Mary Kassa Southfield, a rising software developer and problem solver at Yale University. I’m passionate about building practical, user-friendly software and exploring the intersection of frontend interfaces and scalable backend systems. I enjoy collaborating with diverse teams to transform ideas into real-world tools and experiences. I’m especially drawn to full-stack development, machine learning applications, and educational tech. I love learning new technologies, contributing to open-source projects, and mentoring peers to grow together as engineers and innovators.…Hi, I’m Mary Kassa Southfield, a rising software developer and problem solver at Yale University. I’m passionate about building practical, user-friendly software and exploring the intersection of frontend interfaces and scalable backend systems. I enjoy collaborating with diverse teams to transform ideas into real-world tools and experiences. I’m especially drawn to full-stack development, machine learning applications, and educational tech. I love learning new technologies, contributing to open-source projects, and mentoring peers to grow together as engineers and innovators.

Mary Kassa

Full Stack Developer, Web Developer, Back-End Developer, +2





Hi, I’m Mary Kassa Southfield, a rising software developer and problem solver at Yale University. I’m passionate about building practical, user-friendly software and exploring the intersection of frontend interfaces and scalable backend systems. I enjoy collaborating with diverse teams to transform ideas into real-world tools and experiences. I’m especially drawn to full-stack development, machine learning applications, and educational tech. I love learning new technologies, contributing to open-source projects, and mentoring peers to grow together as engineers and innovators.…Hi, I’m Mary Kassa Southfield, a rising software developer and problem solver at Yale University. I’m passionate about building practical, user-friendly software and exploring the intersection of frontend interfaces and scalable backend systems. I enjoy collaborating with diverse teams to transform ideas into real-world tools and experiences. I’m especially drawn to full-stack development, machine learning applications, and educational tech. I love learning new technologies, contributing to open-source projects, and mentoring peers to grow together as engineers and innovators.

Available to hire

Hi, I’m Mary Kassa Southfield, a rising software developer and problem solver at Yale University. I’m passionate about building practical, user-friendly software and exploring the intersection of frontend interfaces and scalable backend systems. I enjoy collaborating with diverse teams to transform ideas into real-world tools and experiences.

I’m especially drawn to full-stack development, machine learning applications, and educational tech. I love learning new technologies, contributing to open-source projects, and mentoring peers to grow together as engineers and innovators.

Skills

Experience Level

Expert

Expert

Expert

Expert

Expert

Expert

Expert

Intermediate

Intermediate

Intermediate

Intermediate

Language

English

Fluent

Work Experience

Software Development Engineer Intern at Amazon

June 1, 2026 - Present

Contributed to backend services and feature development as a Software Development Engineer Intern; collaborated with cross-functional teams to deliver scalable software solutions.

Software Developer at Yale University

September 1, 2025 - Present

Developed and prototyped Yale Exploration app, integrating Google Gemini API to connect undergraduates with new academic and extracurricular activities via a chat bot.

Web Developer Intern at The Next IT Girl

February 1, 2024 - June 1, 2025

Remote web development intern; updated and maintained a WordPress-based site to improve traffic and user engagement.

Python Remote Machine Learning Research Intern at Pioneer Research Institute

June 1, 2024 - September 1, 2024

Introduced advanced star-detection algorithm with 96% accuracy via CNN training using Python, OpenCV, and TensorFlow/PyTorch; authored a 15-page research paper.

Full Stack Development Teacher at Yale Computer Society

September 1, 2025 - December 1, 2025

Led a weekly cohort of 5 undergraduates on frontend and backend development; increased participation by 35% through a 12-week interactive curriculum and milestone projects.