Frontend Developer

Ryan Mahoney

Ryan Mahoney

Director of Product, FirstWho

“At this level, the hard part is finding engineers who can own a feature without needing constant handholding. We see plenty of candidates who can build a component in isolation but struggle when requirements are vague or the API breaks. They need to show they can debug complex state issues while communicating clearly with designers and backend teams. Writing clean markup is not enough because they must advocate for the outcome and ensure the work ships without creating debt. Finding someone with both technical depth and independent decision-making skills is rare in the current market.”

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Competency Questions

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Core Frontend Engineering

Foundational frontend development competencies for Frontend Developer II, covering UI implementation, component architecture, performance optimization, testing, and accessibility with focus on independent feature delivery.

Accessibility & Standards

Conducts accessibility audits and fixes compliance issues (t44).

Interview round: Hiring Manager Technical Deep Dive

Recall a situation where you implemented interface requirements for diverse users.

Positive indicators

  • Mentions WCAG
  • Tests with tools
  • Considers motor/vision

Negative indicators

  • Mouse only
  • Ignores screen readers
  • No standards mentioned

Attitude Questions

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Accountability Mindset

The consistent willingness to take ownership of tasks, decisions, and outcomes, including errors, ensuring deliverables meet quality standards and commitments are honored without external enforcement.

Interview round: Hiring Manager Technical Deep Dive

How do you handle a scenario where you realize you won't meet a committed deadline?

Positive indicators

  • Alerts team ASAP
  • Proposes plan B
  • Updates stakeholders

Negative indicators

  • Waits until deadline
  • Makes excuses
  • Hides delay

Progression Framework

This table shows how competencies evolve across experience levels. Each cell shows competency at that level.

Core Frontend Engineering

5 competencies

CompetencyJuniorMidSeniorPrincipal
Accessibility & Standards

Implements basic ARIA attributes and semantic HTML following accessibility guidelines and team conventions.

Conducts accessibility audits and fixes compliance issues (t44).

Integrates accessibility into the design system and workflow, ensuring compliance is baked into development processes rather than retrofitted.

Advocates for inclusive design standards across product lines, establishing org-wide accessibility compliance that meets WCAG guidelines and legal requirements.

Component Architecture & State

Builds basic components with local state following team patterns and established conventions.

Implements complex state management and component composition (t03, t18, t22).

Architects scalable component libraries and state synchronization patterns that support team-level development and cross-project reuse.

Sets strategy for state management across multiple products, architecting scalable component libraries and synchronization patterns that serve the entire organization.

Markup & DOM Manipulation

Implements static UI components from designs using standard HTML/CSS patterns with semantic structure and basic responsiveness.

Develops responsive layouts and handles dynamic DOM updates efficiently (t28, t35).

Optimizes DOM structures for performance and accessibility compliance, focusing on architectural decisions rather than basic implementation.

Defines organizational standards for markup semantics and DOM architecture that enable consistent, accessible, and performant UI implementation across all products.

Performance Optimization

Identifies basic performance issues using standard metrics and profiling tools with guidance.

Implements optimizations like code splitting and lazy loading (t16, t17, t30).

Conducts deep profiling and resolves complex rendering bottlenecks to ensure performance budgets are consistently met across critical user journeys.

Defines performance budgets and optimization strategies for the platform, establishing org-wide Core Web Vitals targets and enforcement mechanisms.

Testing & Quality Assurance

Writes unit tests for basic functions and components following team testing standards and coverage requirements.

Develops integration tests and maintains test coverage standards (t09, t25).

Implements end-to-end testing strategies and CI quality gates that ensure reliability across the team's deliverables.

Defines quality metrics and testing architecture for the organization, establishing CI quality gates and testing standards that eliminate entire classes of frontend incidents.

Platform & Product Operations

5 competencies

CompetencyJuniorMidSeniorPrincipal
Build & Release Engineering

Executes build commands and deploys to staging environments following established CI/CD workflows and team procedures.

Configures build tools and manages dependency updates (t37, t53).

Optimizes CI/CD pipelines and manages release trains, reducing organizational complexity through tooling and process improvements.

Architects the deployment infrastructure and release strategy for the organization, establishing progressive delivery patterns and release governance that enable safe, rapid deployments across teams.

Data Integration & APIs

Fetches data using standard HTTP methods and handles loading states, errors, and basic response processing.

Implements caching strategies and error handling for API calls (t23, t24).

Designs data synchronization patterns and optimizes network usage, co-defining API contracts with backend partners to ensure efficient data flows.

Defines API contracts and data governance standards across the organization, establishing type-safe client patterns and data synchronization strategies that enable efficient front-back collaboration.

Observability & Analytics

Implements basic logging and tracks predefined events using existing instrumentation patterns and analytics platforms.

Configures dashboards and alerts for frontend errors (t54, t55).

Designs tracing strategies and analyzes user behavior data to enable effective incident response and data-driven decision making.

Defines observability standards and data-driven decision frameworks for the organization, establishing unified monitoring, tracing, and analytics that enable proactive incident prevention and informed product decisions.

Security & Privacy

Follows security guidelines for input validation and authentication flows as defined by team standards.

Implements secure data handling and mitigates common vulnerabilities (t27, t34).

Conducts security reviews and integrates security into SDLC, ensuring vulnerabilities are identified before reaching production.

Defines security architecture and compliance strategy for the organization, establishing frontend security postures and data privacy frameworks that protect user data at scale.

Technical Leadership & Strategy

Participates in planning sessions and estimates assigned tasks accurately with guidance from senior team members.

Leads small features and mentors junior developers (t41, t42).

Drives technical decisions and cross-team collaboration, translating business needs into technical plans while influencing without direct authority.

Sets technical vision and aligns engineering strategy with business outcomes, delivering multi-quarter technical roadmaps and representing engineering externally to drive organizational impact.