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Enforce data correctness at the database level using constraints, triggers, and domain types so invalid data can never enter the system.

Designs database constraints and validation rules that prevent invalid data at the storage layer.

Design optimal index strategies using B-tree, partial, composite, covering, and expression indexes to accelerate queries without bloating writes.

Produces an optimal indexing strategy that accelerates reads while minimizing write overhead and storage.

Design correct, safe transactions with proper isolation levels, locking strategies, and deadlock prevention for concurrent database access.

Produces correct transaction designs with proper isolation levels, locking, and deadlock prevention.

Master window functions for ranking, running totals, moving averages, and gap analysis without collapsing rows like GROUP BY.

Produces advanced SQL using window functions for ranking, running totals, and row-level analytics.

Diagnose and fix slow SQL queries using EXPLAIN plans, index analysis, query rewriting, and statistics-aware optimization techniques.

Diagnoses slow SQL queries and delivers optimized rewrites backed by EXPLAIN plan analysis.

Write clean, maintainable SQL queries using CTEs, proper joins, subquery patterns, and set-based thinking instead of procedural workarounds.

Produces clean, maintainable SQL queries using CTEs, proper joins, and set-based design patterns.

Profile and optimize Swift code for speed and memory using Instruments, compiler flags, and data structure choices backed by benchmarks.

Identifies performance bottlenecks and delivers measurable optimization with Instruments-backed benchmarks.

Master Swift generics with constrained types, opaque returns, primary associated types, and conditional conformances for type-safe abstractions.

Produces well-constrained generic Swift code that maximizes type safety while keeping APIs ergonomic.

Design robust error handling using typed throws, Result types, and recovery strategies that make failure modes explicit and recoverable.

Produces comprehensive error handling with typed errors, recovery paths, and user-facing error presentation.

Build reliable, fast, and maintainable test suites using XCTest and Swift Testing with proper isolation, mocks, and assertion patterns.

Produces well-structured, deterministic Swift test suites with proper isolation, naming, and assertion patterns.

Eliminate retain cycles, reduce allocations, and manage object lifetimes correctly using ARC, weak/unowned references, and value semantics.

Identifies and fixes memory leaks, retain cycles, and excessive allocations in Swift applications.

Design flexible, composable Swift systems using protocols, associated types, protocol extensions, and existentials instead of deep class hierarchies.

Produces well-designed protocol hierarchies that enable composition, testability, and type-safe abstraction.

Design correct, performant concurrent Swift code using structured concurrency, actors, async/await, and task groups without data races.

Produces data-race-free Swift concurrent code using structured concurrency, actors, and task groups.

Write Swift code that follows Apple conventions, leverages value types, and uses the language features the way they were designed to be used.

Produces clean, idiomatic Swift code that follows Apple platform conventions and Swift API design guidelines.

Design reactive JVM applications using Project Reactor, RxJava, or Kotlin Flow with proper backpressure and error handling.

Produces reactive JVM code that handles backpressure, errors, and cancellation correctly across async boundaries.

Design dependency injection for JVM applications using Spring, Dagger, Koin, or manual wiring with proper scoping and testing.

Produces well-structured JVM dependency graphs that are testable, scopeable, and free of circular dependencies.

Design type-safe Kotlin DSLs using lambda-with-receiver, builder patterns, and scope control with DslMarker.

Produces Kotlin DSLs that are intuitive, type-safe, and provide excellent IDE support with auto-completion.

Design structured concurrent Kotlin programs using coroutines, flows, channels, and proper cancellation handling.

Produces Kotlin coroutine code that is structured, cancellation-safe, and handles backpressure correctly.

Write clean, idiomatic Kotlin using null safety, extension functions, data classes, scope functions, and Kotlin conventions.

Produces Kotlin code that is concise, null-safe, and follows official Kotlin coding conventions and community idioms.

Master Java Streams API with proper collector design, parallel streams, and functional patterns for data processing.

Produces Java stream pipelines that are readable, efficient, and correctly handle parallel execution and edge cases.