# Daryll Cheng > Senior Software Engineer | Payments, Checkout & Merchant Platforms | React, TypeScript, Kotlin | Block (Afterpay / Cash App) Location: San Francisco Bay Area, United States Profile: https://flows.cv/daryll Software engineer focused on payments, checkout, and merchant platforms. I began my career as a behavior therapist, and that background still shapes how I think about people, friction, and product design. I like building systems that make complex experiences feel simple. ## Work Experience ### Software Engineer @ Block Jan 2022 – Present | San Francisco Bay Area Worked across merchant onboarding, checkout, and payments infrastructure at Block, across Afterpay and Cash App. • Built and expanded Merchant Hub, including self service signup and onboarding experiences across multiple regions • Contributed to checkout and platform systems across merchant onboarding, bank account verification, eligibility, and risk related flows • Shipped internal tools and platform improvements that made merchant and payment experiences more scalable, reliable, and easier to operate ### Software Engineer @ Afterpay Touch Jan 2019 – Jan 2022 | San Francisco Bay Area Worked across consumer growth, checkout integrations, merchant platforms, and payments systems at Afterpay. • Co created and later owned the Afterpay Button, a lightweight JavaScript checkout integration, and expanded it across regions with support for Express Checkout, Cash App Pay, and Customer On File payments • Built the Online Card experience across admin and merchant portals, including settlements, exports, configuration, invoices, interchange fee management, and Clearpay support • Contributed to the Cash App Pay launch by integrating PayKit into AfterpayJS and enabling Cash App Pay across checkout, merchant, and admin experiences • Shipped merchant platform and tooling improvements across onboarding, order expiry, refund windows, configuration flows, and internal operational tools • Built consumer growth and analytics integrations including marketing pixels, referral landing pages, Amplitude instrumentation, and compliant rollout patterns ### Software Engineer @ 5miles LLC Jan 2018 – Jan 2019 | Beijing City, China Introduced new features/improvements for both the www.5miles.com Webapp and its Progressive Web App (PWA) platforms built with Angular and Sails.js: listings, reviews + ratings, product categorization & tagging, search auto completion, and many more ### Software Engineer @ CyberMiles Jan 2018 – Jan 2019 | Beijing City, China Designed and created the CyberMiles Explorer Webapp with Vue & Vuex + Egg.js, fetched and dissected blocks & transactions from our Mainnet (www.cmttracking.io) & TestNet (testnet.cmttracking.io) through Web3-cmt.js, and displayed every aspect of our CyberMiles DPOS model to CMT stakeholders Enforced SEO for www.cybermiles.io in September, resulting in reduction of site load speed by over 2 seconds, and increases in users (+67%), organic traffic (+94%), and click through rate (+20%) before the MainNet launched in October Migrated cybermiles.io from WordPress to a JAMstack architecture with Gatsby.js (React + GraphQL), Contentful (Headless CMS) and Netlify (Host) to increase speed, security and scalability ### Full Stack Developer @ Freelance Web Development Jan 2017 – Jan 2019 | San Francisco Bay Area Leveraged the speed and flexibility of Hugo to generate multiple fully customized websites (www.litylang.org & www.noomiwallet.com) for clients with tight deadlines Built full stack applications using: JavaScript (ES6), React, Redux, Angular, Node.js, Express, MongoDB, HTML5/CSS3, Sass, Golang, MySQL, JQuery, D3.js, PostgreSQL, Webpack, Grunt, Git, Firebase, Mocha/Chai, Heroku, Digital Ocean, AWS Please refer to the Projects section below for details or visit www.daryll.io for demo ### Software Engineer @ Thryveinside Jan 2018 – Jan 2018 | San Francisco Bay Area Migrated Thryve’s conversion funnel to a fully customized Shopify e-commerce platform (www.thryveinside.com) using Liquid template Language, JavaScript, and Sass, resulting in a +300% uplift in revenue. Acquired significant growth in customer base and retention through the introduction of various features (kit activation, onboarding interactive survey, individually tailored user reports, etc) using React and Flask. (app.thryveinside.com) ### Parent Training Consultant @ Behavioral Support Partnership Jan 2016 – Jan 2016 | San Francisco Bay Area Taught ABA principles and trained parents in behavior management skills and Pivotal Response Treatment strategies. Designed and guided parents through the implementation of Positive Behavior Support Plans. Submitted progress reports for parents in accordance with regional centers and insurance guidelines and timelines. Set up data collection procedures for each client and monitored progress on child behavior goals, replacement behavior goals, and parent goals. ### Behavior Therapist @ Behavioral Support Partnership Jan 2015 – Jan 2016 Administered 1:1 direct intervention services to children with Autism Spectrum Disorder and other developmental disorders through principles of Pivotal Response Treatment and ABA strategies. ### Research Assistant @ The University of Hong Kong Jan 2014 – Jan 2014 | Hong Kong Assessed participants with insomnia and depression with various cognitive and psychological tasks. Hooked up participants with polysomnography and monitored sleep stages through EEG, EOG and EMG readings. Entered and updated assessment and participant data for SPSS analysis. Assisted in the formulation of new psychological tasks. Conducted literature reviews. Designed recruitment and conference posters. ### Intern @ Napa State Hospital Jan 2013 – Jan 2014 | Napa, CA Facilitated psychosocial rehabilitation for patients with severe mental illness, age-related cognitive decline and criminal history who were under civil or forensic commitments. Shadowed therapeutic processes conducted by professional psychologists and social workers. Stationed at transitional (highly functioning), geriatrics (low functioning, age-related cognitive decline) and Q9 (newly admitted patients varying in functioning) units on a weekly rotation basis. ### Undergraduate Research Assistant @ UC Berkeley Jan 2013 – Jan 2014 | Berkeley, CA Assessed children’s language proficiency, emotion regulation, executive function, and socio-emotional development through standardized questionnaires, assessments, and parent-child interaction tasks. Recruited participants from Head Start Preschool Program Centers in Oakland. Phone screened and interviewed parents to select eligible subjects. Translated and transcribed parent-child interactions from Chinese to English. ### Summer Intern @ The Heroic Imagination Project Jan 2013 – Jan 2013 HIP translates research findings of social psychology and related fields into workshops accessible to individuals from various academic and corporate settings. Assisted the non-profit research-based organization to assimilate the existing curriculum into the Hong Kong education system. ## Education ### Bachelor of Arts (B.A.) in Psychology University of California, Berkeley ### Advanced Software Engineering Immersive Program Hack Reactor ### International Baccalaureate Diploma Programme Shatin College (High School) ### Singapore International School (Hong Kong) ## Contact & Social - LinkedIn: https://linkedin.com/in/daryllcheng - Portfolio: https://daryll.io - Portfolio: https://daryllresu.me --- Source: https://flows.cv/daryll JSON Resume: https://flows.cv/daryll/resume.json Last updated: 2026-03-30