Devin Sebastian Checa
Verified Expert in Engineering
Software Developer
Los Angeles, United States
Toptal member since July 5, 2026
Devin is a software development engineer with 8 years of experience in building secure and scalable software solutions. His expertise spans front-end and full-stack development, with notable work at Microsoft, EASE, and EvolveNXT. Devin resolved 35 accessibility bugs in 1 month at Microsoft to maintain eDiscovery SLA and has led codebase migrations and mentored junior developers.
Portfolio
Experience
- Node.js - 8 years
- TypeScript - 8 years
- HTML5 - 8 years
- CSS3 - 8 years
- JavaScript - 8 years
- SQL - 6 years
- React - 6 years
- Artificial Intelligence (AI) - 3 years
Preferred Environment
Docker, NGINX, Git, Agile, Angular, React, TypeScript, Node.js, SQL, AWS IoT
The most amazing...
...accessibility work I've done is resolving 35 a11y bugs in 1 month to maintain eDiscovery SLA at Microsoft.
Work Experience
Software Development Engineer – Contract
Microsoft
- Leveraged AI agents to generate code changes and review pull requests for correctness.
- Added React tests with Jest, Playwright, and TypeScript to improve codebase test coverage.
- Optimized web application for accessibility via voice access and screen readers.
- Resolved 35 a11y accessibility bugs in one month to maintain eDiscovery SLA.
- Conducted front-end interviews to assess candidate skills and experience.
- Localized code for various languages and resolved UI/UX bugs.
- Built interfaces from Figma mockups for design implementation and demos.
- Optimized React rendering performance with memorization and refactoring.
Senior Front-end Developer
EASE
- Implemented various front-end JavaScript form logic in Angular with RxJS and NgRx.
- Accelerated JavaScript performance through the use of entities and scroll detection.
- Created reusable UI components and services throughout the platform with TypeScript.
- Adapted the Ionic Capacitor app for the Microsoft Store with Electron and a custom NSI installer.
- Securely implemented connectivity for links to open in the browser via Electron API.
- Configured toast notifications for web and Windows platforms in the application.
Full-stack Web Developer
Behavior Frontiers
- Debugged production bugs for a Heroku application and configured deployment hooks.
- Updated code to the latest React and JavaScript features and migrated from LESS to SASS.
- Built interfaces for data entry to eliminate paperwork for handwritten data.
- Developed a mobile-friendly web application optimized for tablets and desktop screens.
- Incorporated configurable Chart.js graphs into a templated progress reporting system.
Full-stack Web Developer
EvolveNXT
- Deployed a cross-platform iOS/Android mobile application in the App Store and Play Store.
- Mentored and onboarded junior developers to implement a mobile application.
- Led codebase migration to upgrade to Bootstrap 4 with modern CSS and SPA features.
- Architected a back-end API for use throughout the cross-platform mobile application.
- Built interfaces using jQuery, Angular/TypeScript, React, and NativeScript for APIs.
- Integrated services for back-end jobs and system events using ColdFusion and SQL Server.
- Set up cryptographic storage in accordance with OWASP.
- Implemented an authenticated token system for data exchange between external systems.
- Extended the reporting system to provide data exports in PDF, text, CSV, and XLSX formats.
- Engaged with clients on phone calls to ensure reporting queries met their needs.
Experience
TI Manager
https://www.ti-manager.com/Education
Master's Degree in Computer Science
University of Massachusetts Dartmouth - Dartmouth, MA, USA
Bachelor's Degree in Mathematics
California State University Dominguez Hills - Dominguez Hills, CA, USA
Certifications
AWS Certified Solutions Architect Associate (SAA-C03)
Amazon Web Services
AWS Certified Cloud Practitioner (CLF-C02)
Amazon Web Services
Skills
Libraries/APIs
React, Playwright, NgRx, Chart.js, jQuery, Node.js, REST APIs, AWS Amplify, RxJS
Tools
Figma, NGINX, Git, Amazon Simple Queue Service (SQS), Amazon Elastic Block Store (EBS)
Languages
TypeScript, JavaScript, HTML5, Less, Sass, CSS, CSS3, SQL, GraphQL, C#, Python
Frameworks
Jest, Angular, Electron, NativeScript, Redux, Spark
Platforms
Heroku, Adobe ColdFusion, AWS Lambda, Amazon EC2, iOS, Android, Docker, AWS IoT
Storage
PostgreSQL, MySQL, Amazon S3 (AWS S3), NoSQL, Amazon DynamoDB
Paradigms
Agile
Other
Artificial Intelligence (AI), Rxjs, Bootstrap 4, SQL Server, EC2, OWASP, Amazon RDS, Algorithms, IP Networks, Performance, Number Theory, Discrete Mathematics
How to Work with Toptal
Toptal matches you directly with global industry experts from our network in hours—not weeks or months.
Share your needs
Choose your talent
Start your risk-free talent trial
Top talent is in high demand.
Start hiring