Conner Frey
Verified Expert in Engineering
Software Developer
Los Angeles, CA, United States
Toptal member since February 4, 2026
Conner is a senior full-stack software engineer with extensive experience building scalable, high-performance web applications. He specializes in TypeScript, React, Next.js, and Node.js, with a strong focus on clean architecture, thoughtful UX, and maintainable systems. Conner has been a founding engineer across multiple startups and was recently the CTO of a music tech AI ads company, where he has shipped reliable features end-to-end, from back-end APIs to polished front-end experiences.
Portfolio
Experience
- JavaScript - 12 years
- React - 12 years
- Node.js - 12 years
- PostgreSQL - 10 years
- React Native - 10 years
- Amazon Web Services (AWS) - 10 years
- TypeScript - 6 years
- Next.js - 4 years
Preferred Environment
React, React Native, Next.js, Docker, Amazon Web Services (AWS), tRPC, Prisma, Figma, PostgreSQL, JavaScript, Tailwind CSS, Application State Management, Full-stack, Web Development
The most amazing...
...thing I've developed is an iOS location scouting and planning application for the film industry called Locatr.
Work Experience
Full-stack Engineer
KALO
- Standardized the front-end design system by migrating legacy components into a scalable TypeScript-based UI library (Radix UI, Tailwind, TanStack), reducing UI regressions and accelerating feature delivery 3x, with Storybook-driven visual validation.
- Built the internal admin interface to reduce the manual work of C-levels for onboarding and managing users and organizations.
- Integrated new authentication into the application.
Chief Technology Officer
SymphonyOS
- Accomplished a full platform rebuild, eliminating technical debt, resolving hundreds of legacy bugs, and stabilizing the codebase.
- Built and launched Website Builder, empowering 1,000+ artists to deploy brand-specific sites with integrated data collection and analytics, driving paid subscription growth and reducing customer churn.
- Architected an external RESTful API allowing partners to embed our AI ads technology within their applications, increasing revenue.
- Managed and mentored a team of four engineers, owning code review standards, pull request workflows, hiring, onboarding, and the production of a CI/CD pipeline to maintain code quality and delivery velocity.
- Accelerated product velocity by 5x and drove MRR growth from $40,000 to $50,000 in one month. Reduced churn by 5%.
Lead Front-end Software Engineer
Afterparty
- Owned the entire front-end architecture, partnering closely with C-level leadership and our designer to evolve the product through multiple pivots and support growth through Series B funding ($12 million raised).
- Built core user-facing products, including a live video streaming service, an NFT marketplace, real-time chatrooms, and an AI chat.
- Trained technical and non-technical team members on our custom CMS, enabling product and marketing teams to update live promotional content independently and increasing iteration speed fivefold.
Lead Front-end Engineer and UI/UX Designer
Music Audience Exchange - MAX
- Designed the UI/UX and built custom websites for brand partnerships and campaigns with major partners, including Canon, Coors Light, and Cricket Mobile, owning the front end end-to-end.
- Built an admin and client data platform unifying artist and brand insights, directly improving campaign matching, execution visibility, and performance outcomes.
- Collaborated closely with design to improve UI/UX, enhancing usability, clarity, and overall user experience.
Lead Front-end Engineer and UI/UX Designer
Red Shepherd
- Designed and built the point-of-sale interface and admin/client dashboards supporting cached processor-specific fees to dynamically route transactions and minimize per-transaction costs for around $1 million in annual recurring transactions.
- Managed a team of two engineers, driving execution through clear deadlines, technical leadership, and detailed product specs.
- Participated in founding-level discussions with executive leadership to shape product direction and technical strategy.
Experience
Locatr App
https://apps.apple.com/us/app/locatr-app/id6749589846Portfolio Website
https://connerfrey.comEducation
Bachelor's Degree in Computer Science and Engineering
University of Southern California - Los Angeles, CA, USA
Bachelor's Degree in Computer Science and Engineering
University of California, Davis - Davis, CA
Skills
Libraries/APIs
React, Node.js, Zod, Stripe
Tools
Prisma, Figma, Sequelize, Agora
Languages
JavaScript, TypeScript, CSS, HTML5, C, C++
Frameworks
React Native, Tailwind CSS, Material UI, Redux, Next.js, tRPC, Express.js
Paradigms
Mobile Development, Object-oriented Programming (OOP)
Platforms
Amazon Web Services (AWS), Vercel, Google Cloud Platform (GCP), Docker
Storage
PostgreSQL
Other
Tailwind UI, AI Tools, Application State Management, Full-stack, Web Development, Large Language Models (LLMs), Artificial Intelligence (AI), Software Development, Algorithms, Software Architecture, Computer Science, Engineering, Turborepo, Web UX, Web UI
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