Senior Software Development Skills

Implement a Laravel use case as an application service independent of HTTP and Eloquent.

Use Laravel's service container to invert a concrete infrastructure dependency.

Validate and map boundary input without leaking transport-specific data into the domain model.

Represent expected failures explicitly and map them to consistent HTTP responses.

Define a transaction boundary around a multi-step business operation.

Use PHP static analysis to uncover type and nullability defects.

Refactor a large Laravel controller into cohesive, testable collaborators.

Evaluate a PHP code change using readability, complexity, coupling, and change-risk criteria.

Evaluate a relational schema for cardinality, normalization, and update anomalies, then revise it for a business workflow.

Enforce business invariants with relational constraints.

Interpret a query execution plan to locate an expensive operation.

Create an index matched to a query's filtering, joining, and ordering behavior.

Detect and remove an N+1 query pattern in an Eloquent workflow.

Select an appropriate transaction isolation level for a concurrency scenario.

Prevent a lost update using optimistic or pessimistic concurrency control.

Plan a backward-compatible database migration for a live application.

Design resource boundaries and HTTP semantics for a workflow involving partial updates and conflicting state transitions.

Document an API operation with an OpenAPI contract.

Design a stable machine-readable validation and error-response format.

Implement cursor pagination with deterministic ordering.

Choose an authentication approach for a browser client and justify its security trade-offs.

Enforce object-level authorization with Laravel policies.

Make a state-changing API operation idempotent.

Evolve an API contract without unexpectedly breaking existing clients.

Migrate a TypeScript feature to strict checking and eliminate unsafe assumptions at its boundaries.

Model asynchronous UI states with a discriminated union.

Separate server state, URL state, form state, and local interaction state.

Design component boundaries around stable responsibilities and data flow.

Extract reusable behavior into a custom hook without hiding dependencies.

Implement a type-safe form with schema-driven validation and accessible error reporting.

Define route boundaries that support lazy loading and feature ownership.

Implement a consistent React error boundary and recovery experience.

Implement server-state caching with explicit freshness and invalidation rules.

Implement an optimistic update with rollback after a failed request.

Prevent stale asynchronous responses from overwriting newer UI state.

Use the React Profiler to diagnose an avoidable render bottleneck.

Measure and improve one Core Web Vital in a React page.

Build a keyboard-operable component with correct focus management and accessible naming.

Evaluate SPA, server-rendered, and hybrid rendering against SEO and performance requirements.

Define a reusable component API that preserves accessibility and visual consistency.

Create a threat model for a full-stack feature by identifying assets, actors, trust boundaries, and abuse cases.

Design a deny-by-default authorization matrix covering roles, resource ownership, and tenant boundaries.

Select defenses against XSS and CSRF for a React and Laravel application.

Prevent SQL, command, and template injection at application boundaries.

Design secure session, cookie, and token lifecycles.

Validate and store an untrusted file upload safely.

Manage application secrets without committing or exposing them in runtime output.

Assess a dependency vulnerability and choose an appropriate remediation.

Map application risks to an appropriate mix of unit, integration, contract, and end-to-end tests.

Write a PHP unit test for a domain rule without framework or database dependencies.

Write a Laravel integration test that verifies persistence and transaction behavior.

Verify an API implementation against its documented contract.

Test user-visible React behavior without asserting implementation details.

Create a deterministic end-to-end test for a critical user journey.

Use test doubles according to the boundary and failure mode being simulated.

Configure CI quality gates for tests, static analysis, formatting, and build validation.

Build a minimal multi-stage production image for Laravel with compiled React assets.

Design a CI/CD pipeline with reproducible builds and controlled environment promotion.

Choose a rolling, blue-green, or canary deployment strategy for a release risk.

Implement readiness, liveness, and dependency health checks.

Emit structured logs with request and correlation identifiers across application boundaries.

Define service-level indicators and an actionable service-level objective.

Instrument a critical request path with metrics and distributed tracing.

Create an incident runbook from a realistic application failure mode.

Decide whether a workflow should execute synchronously, in a queue, or through an event.

Implement an idempotent Laravel queued job.

Configure retries with backoff and terminal failure handling.

Use the transactional outbox pattern to publish work reliably after a database change.

Design a webhook consumer that verifies authenticity and handles duplicate delivery.

Represent an eventually consistent operation using HTTP 202, a status resource, and a pending UI state.

Prevent duplicate concurrent processing of a shared resource with an atomic distributed lock.

Trace a failed asynchronous workflow across its producer, queue, and consumer.

Estimate traffic, storage, bandwidth, and concurrency for a proposed feature.

Run a load test and identify the first limiting system resource.

Make an application tier horizontally scalable by removing local process state.

Design a cache hierarchy with explicit ownership, invalidation rules, and failure behavior across browsers, a CDN, and application caches.

Select between database scaling options based on read, write, and consistency requirements.

Design a resilience policy for a remote dependency using appropriate timeout, retry, circuit-breaker, and bulkhead controls.

Identify a system's single points of failure and propose resilience improvements.

Produce a system design that connects requirements, components, data flows, trade-offs, and operational risks.

Decompose an ambiguous product initiative into independently deliverable technical slices.

Estimate a technical slice while making uncertainty, dependencies, and assumptions explicit.

Review a pull request for correctness, maintainability, security, testing, and operability.

Refactor a risky legacy seam while preserving behavior with characterization tests.

Facilitate a design review that surfaces constraints and reaches a documented decision.

Give specific, actionable code-review feedback that supports another developer's growth.

Prioritize technical debt using business impact, engineering risk, and remediation cost.

Present a production-readiness review of a capstone full-stack system and defend its architectural trade-offs to technical and non-technical stakeholders.