Steve Castillo
Full-Stack Developer for web apps and business systems
New to Contra
Steve is ready for their next project!
Provided technical consulting for an existing software platform, focusing on code quality, maintainability, architecture, and engineering standards.
I reviewed pull requests and existing implementations to identify technical debt, recurring code issues, architectural risks, and opportunities for improvement.
My work included defining code conventions and development guidelines, evaluating technical trade-offs, supporting architectural decisions, and proposing improvements based on scalability, performance, maintainability, and delivery constraints.
I also contributed to the design of REST API endpoints for transactional business modules, including virtual wallet operations, payment splitting, and mixed-payment flows requiring data consistency and atomic transactions.
This is a confidential case study. Client source code, internal documentation, credentials, proprietary business rules, and sensitive platform information are not displayed.
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Created a complete Figma design for an online marketplace, including a responsive landing page, product discovery sections, authentication flows, favorites, chat, and publishing screens.
The design was structured with reusable components, clear visual hierarchy, responsive behavior, and a consistent design system.
I help businesses transform Figma designs into production-ready landing pages and web applications using Next.js, Astro, React, TypeScript, and Tailwind CSS.
My work covers responsive implementation, clean frontend architecture, forms, animations, API integration, SEO basics, performance optimization, and deployment.
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Developed and improved a responsive institutional platform for managing budget requests, payments, expense reports, POA processes, approvals, documents, and administrative reporting.
I worked across the full stack, implementing frontend interfaces with Next.js and TypeScript, backend APIs with NestJS, role-based access control, and PostgreSQL data management.
The platform includes operational dashboards, advanced filters, Excel exports, document workflows integrated with Google Drive, and performance optimizations for frequently accessed views and queries.
This project is presented as a confidential case study. Sensitive data, credentials, proprietary business rules, and internal information are not displayed.
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Built a secure enterprise web platform for managing organizations, users, configurable forms, operational workflows, and business dashboards.
I contributed to the frontend architecture, backend integrations, database design, role-based access control, and responsive user experience.
The platform centralizes operational information and allows authorized users to manage records, monitor activity, and access structured reports from a single interface.
All visuals, names, and data shown in this case study have been anonymized to protect client confidentiality.
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