diff --git a/justfile b/justfile
new file mode 100644
index 0000000..af2d0e2
--- /dev/null
+++ b/justfile
@@ -0,0 +1,212 @@
+# justfile for dagx crate
+# High-level development and CI workflows
+
+# =============================================================================
+# Configuration
+# =============================================================================
+
+# Treat all warnings as errors
+rustflags := "-D warnings"
+
+# Code coverage target percentage (fail if below this threshold)
+coverage_target := "80"
+
+# Timeout for coverage analysis in seconds
+coverage_timeout := "600"
+
+# Benchmark timeout in seconds
+bench_timeout := "300"
+
+# =============================================================================
+
+# Default recipe - show available recipes
+default:
+    @just --list
+
+# =============================================================================
+# Primary Development Workflows
+# =============================================================================
+
+# Quick development loop: format + lint + fast tests
+dev:
+    #!/usr/bin/env bash
+    set -e
+    echo "🔄 Running development checks..."
+    cargo fmt
+    RUSTFLAGS="{{rustflags}}" cargo clippy --all-targets --all-features &
+    RUSTFLAGS="{{rustflags}}" cargo nextest run --lib --all-features &
+    wait
+    echo "✅ Development checks passed"
+
+# Pre-commit checks: format-check + lint + typecheck
+check:
+    @echo "Running format check..."
+    cargo fmt -- --check
+    @echo ""
+    @echo "Running clippy..."
+    RUSTFLAGS="{{rustflags}}" cargo clippy --all-targets --all-features
+    RUSTFLAGS="{{rustflags}}" cargo clippy --all-targets --no-default-features
+    @echo ""
+    @echo "Verifying compilation..."
+    RUSTFLAGS="{{rustflags}}" cargo test --lib --all-features --no-run
+    RUSTFLAGS="{{rustflags}}" cargo test --lib --no-default-features --no-run
+    @echo ""
+    @echo "✅ All checks passed"
+
+# Run all tests
+test:
+    @echo "Running all tests..."
+    RUSTFLAGS="{{rustflags}}" cargo nextest run --lib --all-features
+    @echo "✅ All tests passed"
+
+# Before pushing: check + test + coverage
+pre-push: check test coverage
+    @echo ""
+    @echo "✅ Pre-push checks passed - safe to push!"
+
+# Comprehensive pre-release validation
+pre-release: check test coverage audit examples bench-check
+    #!/usr/bin/env bash
+    set -e
+
+    # Verify documentation version matches crate version
+    echo ""
+    echo "📋 Verifying documentation version..."
+    VERSION=$(grep '^version = ' Cargo.toml | head -1 | sed 's/.*"\(.*\)".*/\1/')
+    MAJOR_MINOR=$(echo $VERSION | cut -d. -f1-2)
+
+    if ! grep -q "dagx = \"$MAJOR_MINOR\"" README.md; then
+        echo "❌ ERROR: README.md should reference version $MAJOR_MINOR (crate is $VERSION)"
+        echo "   Update installation examples in README.md"
+        exit 1
+    fi
+    echo "✅ Documentation version correct: $MAJOR_MINOR"
+
+    # Package verification
+    echo ""
+    echo "📦 Verifying package..."
+    cargo publish --dry-run
+    cargo package --list > /tmp/dagx-files.txt
+    echo "✅ Package verified"
+
+    echo ""
+    echo "✅ All pre-release checks passed!"
+    echo "  - Code formatted and linted"
+    echo "  - All tests passing"
+    echo "  - Code coverage ≥ {{coverage_target}}%"
+    echo "  - No security vulnerabilities"
+    echo "  - Dependencies verified"
+    echo "  - All examples run successfully"
+    echo "  - All benchmarks compile"
+    echo "  - Documentation version verified"
+    echo "  - Package ready for publication"
+    echo ""
+    echo "📦 Ready to publish! Run: cargo publish"
+
+# =============================================================================
+# Quality & Security
+# =============================================================================
+
+# Run code coverage analysis
+coverage:
+    @echo "Running code coverage analysis (target: {{coverage_target}}%)..."
+    cargo llvm-cov nextest --lib --html --output-dir coverage --fail-under-lines {{coverage_target}}
+    @echo "Coverage report: coverage/html/index.html"
+
+# Mutation testing with cargo-mutants
+mutants:
+    @echo "Running mutation testing..."
+    @echo "⚠️  This will use significant CPU and memory resources!"
+    cargo mutants \
+        --no-shuffle \
+        --test-tool nextest \
+        --jobs 3 \
+        --all-features \
+        -vV
+
+# Security audit + dependency checks
+audit:
+    @echo "🔒 Running security checks..."
+    cargo audit
+    @echo "✅ Security checks passed"
+
+# Run Miri for undefined behavior detection
+miri:
+    @echo "Running Miri tests for UB detection..."
+    cargo +nightly miri test --lib
+
+# =============================================================================
+# Benchmarks
+# =============================================================================
+
+# Verify benchmarks compile
+bench-check:
+    @echo "Verifying benchmarks compile..."
+    cargo bench --no-run
+    @echo "✅ All benchmarks compile"
+
+# Run all benchmarks
+bench:
+    cargo bench
+
+# Run benchmarks and save as baseline
+bench-baseline:
+    cargo bench -- --save-baseline baseline
+
+# Compare benchmarks against baseline
+bench-compare:
+    cargo bench -- --baseline baseline
+
+# Run specific benchmark suite
+bench-suite suite:
+    cargo bench --bench {{suite}}
+
+# =============================================================================
+# Documentation & Utilities
+# =============================================================================
+
+# Build documentation and open in browser
+doc:
+    cargo doc --no-deps --all-features --open
+
+# Format code
+fmt:
+    cargo fmt
+
+# Show project information
+info:
+    @echo "dagx crate - Type-safe DAG execution framework for async Rust"
+    @echo ""
+    @echo "Rust: $(rustc --version)"
+    @echo "Cargo: $(cargo --version)"
+    @echo ""
+    @echo "Dependencies:"
+    @cargo tree --depth 1
+
+# Run all examples
+examples:
+    @echo "Running all examples..."
+    cargo run --example 01_basic
+    cargo run --example 02_fan_out
+    cargo run --example 03_fan_in
+    cargo run --example 04_parallel_computation
+    cargo run --example circuit_breaker
+    cargo run --example complex_dag
+    cargo run --example conditional_workflow
+    cargo run --example custom_types
+    cargo run --example data_pipeline
+    cargo run --example debug_tracing
+    cargo run --example error_handling
+    cargo run --example large_dag
+    cargo run --example parallelism_proof
+    cargo run --example retry_strategies
+    cargo run --example timeout
+    cargo run --example tracing_example
+    @echo "✅ All examples completed successfully"
+
+# Clean build artifacts
+clean:
+    cargo clean
+    rm -rf mutants.out/ mutants.out.old/ mutation_history.json
+    rm -rf target/criterion
+    rm -rf coverage/