Mariah de Guzman
@mariahdeguzman
Software Engineer focused on React/TypeScript SaaS performance, scalability, and maintainable, responsive user experiences.
SingaporeWhat I'm looking for
I’m a Software Engineer with 6 years of experience building and improving SaaS applications. At Saleswhale (acquired by 6sense in 2022), I migrated the main application to a new frontend focused on mobile-friendly, responsive development using ReactJS and TypeScript, improving long-term maintainability. I also collaborated with the product team to deliver features on a quarterly cadence, driving a 19% increase in ARR while strengthening performance and scalability.
I care deeply about reliability and clean implementation, and I increased code reliability by achieving 80% test coverage through unit and integration tests with Jest and Playwright. I led a website revamp by building reusable modules to enable maintainable page development, and I previously served as a Frontend Developer where I led frontend code reviews as a primary PR approver and set up the Jest testing framework for unit and integration testing. Earlier, I worked as a Web & Graphic Designer, designing and developing product websites and creating brand-aligned graphics that kept campaigns consistent.
Experience
Work history, roles, and key accomplishments
Software Engineer
Saleswhale
Jul 2020 - Present (6 years)
Migrated the main application to a new mobile-focused frontend using ReactJS and TypeScript, improving responsive SaaS developer experience and maintainability. Collaborated with product to deliver features on a quarterly cadence and increased ARR by 19% while improving reliability with unit and integration tests using Jest and Playwright.
Frontend Developer
Sta. Clara International Corporation
Feb 2022 - Aug 2022 (6 months)
Led frontend code reviews as the primary PR approver for the ReactJS and TypeScript codebase. Set up the application’s Jest testing framework to enable unit and integration testing and collaborated on prototypes for new features.
Web & Graphic Designer
Unica Publications
Jul 2017 - Jul 2020 (3 years)
Designed and developed company and affiliate product websites. Developed reusable sales landing page templates, created website graphics with brand consistency, and took charge of layout and design for three monthly magazines.
Web & Graphic Designer
Graphics Zoo
Nov 2018 - Dec 2018 (1 month)
Designed and delivered client websites and print collateral aligned with business branding and goals. Led rebranding initiatives, including logo redesigns and updated brand guidelines, and created branded assets tailored to each client’s identity.
Education
Degrees, certifications, and relevant coursework
Ateneo de Manila University
Bachelor of Science, Communications Technology Management
Activities and societies: Dean’s Lister; Ateneo College Scholar
Earned a B.S. in Communications Technology Management at Ateneo de Manila University, completed in May 2017. Recognized as a Dean’s Lister and Ateneo College Scholar.
Tech stack
Software and tools used professionally
Availability
Location
SingaporeAuthorized to work in
Job categories
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