Yelsin Tomas Sepulveda

Software Engineer | Cloud DevOps

Experience

KDE — GSoC’25 Contributor

June 2025 – Present · Remote

• Submitted proposal and was accepted to develop gaming controller support in Plasma Desktop through KWin, addressing a long-standing system suspension issue and adding basic system navigation.
• Implemented the solution using C++, Qt Framework, CMake, KDE Frameworks, and the Linux Kernel Input Subsystem API.
• Collaborate closely with KDE/KWin maintainers and mentors throughout development lifecycles, participate in code reviews, technical discussions on Matrix channels, and publish public blog posts.

Amazon Web Services — SDE DevOps, Innovation Engineering

Sep 2023 – June 2024 · Remote

• Developed and refactored multi-stage CI/CD pipelines, reducing pipeline execution time by 40% (~30 min → ~18 min) and improving infrastructure maintainability using CloudFormation, CDK, CodePipeline, TypeScript, ECS, EKS, and Docker.
• Built 15+ reusable CDK L3 constructs, encapsulating resources such as VPN, S3, EC2, ECS, RDS, and networking for Marshall (internal web platform), significantly reducing configuration complexity and drift.

Amazon Web Services — Solutions Architect (Intern → Associate)

Jan 2021 – Sep 2023 · Arlington, VA

• Created User Acceptance Test documentation, automated tests, and reporting for the AWS Secure Environment Accelerator, validating expected security controls using Python, unittest, and Boto3.
• Developed deep technical expertise across core AWS services including EC2, Lambda, S3, RDS, VPC, CloudFormation, IAM, and CloudWatch, following the AWS Well-Architected Framework.
• Architected AWS environments for public sector and enterprise customers, advising on least-privilege IAM, encryption, backups, networking, and the Shared Responsibility Model.
• Supported executive demos and client workshops, translating complex architectures into actionable business insights.

AthenaHealth — NE1 Intern, Platform Services

June 2020 – May 2021 · Watertown, MA

• Developed new infrastructure for Okta authentication resources, converting imperative JavaScript scripts into a declarative Terraform-based system.
• Created a CI/CD pipeline using Jenkins and Docker, automating code fetch, Puppeteer smoke tests, and deployment to AWS EC2.
• Worked within a Scrum team following Agile workflows, including daily standups, Jira ticketing, bi-weekly sprints, and retrospectives.

• LinkedIn
• GitHub
• GitLab
• yelsinsepulveda@gmail.com

Skills

Languages

Tools

Cloud & Infrastructure

Personal Projects

Open Source Contributor — KDE (2025)

• Contributions to Angelfish, KWin, and Plasma Desktop Technologies: C++, Qt, CMake

Retrodex Miyoo — Pokédex App (2024)

• Pokédex application for Onion-OS on gaming handhelds using the miyoomini-toolchain Technologies: C++, SDL, CMake

Certifications

• AWS Certified Cloud Practitioner — J3W7057DJERE1WSZ
• AWS Certified Solutions Architect: Associate — MMWL2GE2WEBEQH58
• AWS Certified Developer: Associate — MEGK0X01XNREQCWW