Dallon Feldner

• Used intentional time between roles to pursue independent engineering projects and personal interests.
• Practiced and explored AI-assisted engineering and agentic workflows with various projects, including a Discord poll bot, a real-time brainstorming and note-taking app, and porting a playlist management CLI from Python to Go.
• Explored and experimented with embeddings, semantic clustering, and non-trivial PostgreSQL queries in a personal link-tracking application with gamified design for pruning a long backlog.

• Full-stack engineer on a B2B procurement SaaS platform: React/Next.js, Node.js microservices, GraphQL Federation, DynamoDB and Lambda on AWS with SST.
• Established the foundational architecture and shared tooling for a Turborepo monorepo adopted as the standard for new web apps (>12 apps built on it, maintained by ~25 engineers): shared data-fetching, auth, and config packages, GitHub Actions CI/CD, and a Next.js admin portal that became the reference template.
• Mentored junior engineers, including focused, fundamentals-first projects.
• Built full-stack generative-UI charting for an LLM-powered natural-language data-analysis assistant (powered by OpenAI and GPT, Vercel AI SDK, and agentic tool-calling), owning the tool-call schemas, prompt rules, and frontend rendering.

Tools used: React, Next.js, TypeScript, Node.js, HTML, CSS, GraphQL (including Federation), DynamoDB, AWS (Lambda, ECS, SQS), SST, Docker, GitHub Actions (CI/CD), Datadog, Vitest, Testing Library, Testcontainers, Tailwind, styled-components, shadcn/ui, Auth0, Algolia, Turborepo, TanStack Query

• Refactored the React-based Page Builder editor to use idiomatic React state and lifecycle management, decomposing monolithic components and explicitly designing testable shared-vs-local state boundaries.
• Eliminated full reloads of the iframe-preview on every edit (causing flickering and scroll resets) by moving to atomic, block-level re-rendering, materially improving editor responsiveness.
• Architected and implemented a micro-frontend approach that embedded modern React experiences (including the Page Builder) into a legacy classic-ASP platform, packaged as Web Components with Shadow DOM for style and runtime isolation.

Tools used: TypeScript, React, Node.js, REST APIs, CSS-in-JS (Aphrodite), Web Components/Shadow DOM

• Delivered a worker referral and bonus-attribution feature full-stack across a React+Angular.js frontend and Rails REST backend, contributing to a live marketplace product.
• Architected and led a headless-CMS (Prismic) integration for a static marketing site, enabling non-technical stakeholders to build and edit pages independently and removing routine engineering involvement in content updates.
• Worked within a high-coverage testing culture, including a mandatory 100% coverage policy, writing React (with Jest and Enzyme) and Rails tests alongside feature work, and enforcing quality through peer code review.

Tools used: React, AngularJS, TypeScript, Jest, Enzyme, Ruby on Rails

• Co-developed the re-platform of a legacy PHP content-management interface into a single-page application backed by a purpose-built GraphQL API, delivering significant performance improvements for customers.
• Proposed, designed, built, and maintained a Node.js and Apollo Server GraphQL layer consolidating ~6 backend microservices with REST APIs into a single strongly typed API, reducing client round trips and simplifying asynchronous data flow.
• Advocated for and implemented server-side enforcement of authorization and trust-boundary security principles at the GraphQL layer, filling an architectural gap from a migration from legacy server-side PHP to front-end single-page apps (SPAs).
• Created and maintained a forked Create React App toolchain that became the team’s standard project scaffold, codifying shared standards into a reusable core and eliminating per-project CRA ejection.

Tools used: React, GraphQL, Apollo Client, Apollo Server, Jest, Styleguidist, Webpack

• Built the live fleet-tracking dashboard for a satellite-connected IoT logistics SaaS, plotting vehicle position and cargo-access events on an interactive Leaflet map in React, Redux, and TypeScript.
• Worked full-stack on a backend-focused team, contributing Java/Spring REST endpoints that served the dashboard in addition to owning the front end.
• Established the dashboard’s UI design system independently, as the first implementation of visual language from an external design proposal originally for a separate application, partnering closely with the CTO and company leadership.

Tools used: React, Redux, Webpack, TypeScript, Leaflet, Java, Spring

• Collaborated with design to translate mockups into interactive pages, proposing changes that simplified implementation and strengthened UX consistency.
• Partnered with the marketing team to implement A/B experiments in Optimizely, building test variants and triggers, monitoring outcomes, and advising on interpretation.
• Owned greenfield front-end projects end to end, configuring modern build tooling from scratch (using Grunt, Gulp, Babel, and other tools) for task automation, asset bundling, and transpilation.

Tools used: Node.js, Angular, React, Grunt, Gulp, Babel

• Ported a large realtime communication application from Mac OS X and iPhone to Web, Android, and Windows.
• Designed and developed a data visualization portal to view analytics from the company’s iPhone games.
• Assisted in development on several of the company’s iPhone games using an in-house C++ engine and Lua scripting.

Tools used: AngularJS, Android SDK, C#, WPF, WebSockets, MongoDB, Objective-C, C++, Lua

For projekt202, developed a single-page web application for sensor data visualization.

For StrongLoop, prototyped custom editor UI for LoopBack framework; designed and developed a web interface for users to submit support tickets.

For Unicon, developed a single-page mobile web application for tablet devices using AngularJS, supporting uninterrupted work even offline.

Tools used: AngularJS, highcharts, Node.js.

• Built web-based IDE, including database view and code editors, for backend-as-a-service product
• Developed example applications and documentation for various front-end frameworks, including AngularJS, Knockout, and Backbone.js
• Engaged with community to answer questions and triage feedback.

Tools used: Node.js, MongoDB, Knockout.

Developed and maintained projects for various clients, from content updates to full Android apps.

Tools used: HTML5, CSS, jQuery, Backbone.js, Ruby, ASP.NET, Java, PHP.

(Note: Terralever is now known as LaneTerralever)