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# Marcus Decius

Rubicon Heights, Colorado | 303-555-0112 | marcus.decius@example.com | marcus.example.com | github.example.com/mdec

## Front-End Software Engineer

Front-end engineer with six years of experience building accessible, performance-sensitive web applications and shared design-system infrastructure. Works across product discovery, TypeScript and React implementation, automated testing, observability, and incremental migration of high-traffic interfaces.

## Technical Profile

**Languages:** TypeScript, JavaScript, HTML, CSS, SQL

**Applications:** React, Next.js, Vite, TanStack Query, Node.js, REST, GraphQL

**Quality:** Playwright, Vitest, Testing Library, Storybook, axe-core, Web Vitals, OpenTelemetry

**Delivery:** GitHub Actions, feature flags, canary releases, incident review, performance budgets

## Experience

### Senior Front-End Engineer | Forum Works | Rubicon Heights, CO

*October 2023-Present*

- Lead front-end delivery for a multi-tenant operations workspace used by 18,000 monthly active users, partnering with product, design, API, and support teams from discovery through rollout.
- Replaced duplicated form implementations with typed field primitives, schema adapters, and accessibility tests adopted by five product teams; reduced median form-feature delivery time by 31% across two quarters.
- Split a 1.4 MB initial JavaScript bundle by route and interaction priority, reducing p75 mobile interaction latency from 420 ms to 238 ms on production traffic.
- Designed a resumable upload workflow with explicit state transitions, idempotent retries, and user-visible recovery; support cases for interrupted uploads fell 44% after release.
- Added browser traces, Web Vitals dashboards, and release annotations that shortened diagnosis of front-end regressions during on-call response.

### Front-End Engineer | Cassia Commerce | Sardis Crossing, Oregon

*June 2020-September 2023*

- Built checkout, account, and catalog experiences in React and TypeScript for a regional commerce platform serving 240 merchants.
- Migrated 37 legacy screens into a shared component library without a stop-the-world rewrite, retaining route behavior behind visual regression and contract tests.
- Worked with design to establish keyboard, focus, error-message, contrast, and reduced-motion requirements; remediated 73 audited issues and added checks to pull requests.
- Implemented product-image responsive loading and cache policy changes that reduced p75 largest contentful paint by 0.8 seconds on mid-range mobile devices.

## Selected Engineering Work

### Stateflow Inspector | Maintainer

- Created a fictional open-source browser tool that visualizes reducer and state-machine transitions from recorded JSON without sending application data to a server.
- Published typed adapters, privacy-preserving sample fixtures, contributor documentation, and 96 automated tests; reviewed 14 community pull requests.

## Education

**B.S., Computer Science** | Brutus Valley University | 2020

## Working Practices

Accessible interfaces | Progressive enhancement | State modeling | API contracts | Performance profiling | Design systems | Test strategy | Technical writing | Mentoring