diff --git a/build/esp32/Makefile b/build/esp32/Makefile
new file mode 100644
index 0000000..75cce14
--- /dev/null
+++ b/build/esp32/Makefile
@@ -0,0 +1,61 @@
+# ========================================================== #
+# Spider Runtime - ESP32 Build System                        #
+# Toolchain: Espressif ESP-IDF (xtensa-esp-elf-g++)          #
+# ========================================================== #
+
+CC          := xtensa-esp-elf-g++
+TARGET      := spider_esp32.elf
+SRCDIR      := ../../src
+BUILDDIR    := bin
+TARGETDIR   := out
+SRCEXT      := cpp
+OBJEXT      := o
+
+ESP_FLAGS   := -DESP32 -DSPIDER_DISTRO_MICRO -DSPIDER_OS_NONE -mlongcalls -ffunction-sections -fdata-sections -fno-exceptions -fno-rtti
+
+CFLAGS      := -Wall -std=c++20 -DSPIDER_COMPILING $(ESP_FLAGS)
+LFLAGS      := -Wl,--gc-sections -mlongcalls
+INC         := -I../../src/
+
+# Exclude desktop-only modules
+EXCLUDE     := $(SRCDIR)/spider/runtime/util/Terminal.cpp \
+               $(SRCDIR)/spider/runtime/debug/LiveDebug.cpp \
+               $(SRCDIR)/spider/SpiderRuntime.cpp
+
+# ESP32 specific entry point (local to this build folder)
+EXTRA       := ./main_esp32.cpp
+
+SOURCES     := $(filter-out $(EXCLUDE), $(shell find $(SRCDIR) -type f -name "*.$(SRCEXT)" 2>/dev/null)) $(EXTRA)
+OBJECTS     := $(patsubst ./%,$(BUILDDIR)/%,$(patsubst $(SRCDIR)/%,$(BUILDDIR)/%,$(SOURCES:.$(SRCEXT)=.$(OBJEXT))))
+
+all: directories $(TARGET)
+	@echo "Build complete: $(TARGETDIR)/$(TARGET)"
+
+remake: cleaner all
+
+directories:
+	@mkdir -p $(TARGETDIR)
+	@mkdir -p $(BUILDDIR)
+
+clean:
+	@$(RM) -rf $(BUILDDIR)
+
+cleaner: clean
+	@$(RM) -rf $(TARGETDIR)
+
+$(TARGET): $(OBJECTS)
+	@echo "Linking $(TARGET)..."
+	$(CC) $(LFLAGS) -o $(TARGETDIR)/$(TARGET) $^
+	@echo "Done!"
+
+$(BUILDDIR)/%.$(OBJEXT): $(SRCDIR)/%.$(SRCEXT)
+	@mkdir -p $(dir $@)
+	@echo "Compiling $<..."
+	$(CC) $(CFLAGS) $(INC) -c -o $@ $<
+
+$(BUILDDIR)/%.$(OBJEXT): ./%.$(SRCEXT)
+	@mkdir -p $(dir $@)
+	@echo "Compiling $<..."
+	$(CC) $(CFLAGS) $(INC) -c -o $@ $<
+
+.PHONY: all remake clean cleaner
diff --git a/build/esp32/bin/main_esp32.o b/build/esp32/bin/main_esp32.o
new file mode 100644
index 0000000..f8c2995
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diff --git a/build/esp32/bin/spider/runtime/Runtime.o b/build/esp32/bin/spider/runtime/Runtime.o
new file mode 100644
index 0000000..3a12a87
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diff --git a/build/esp32/bin/spider/runtime/cpu/CPU.o b/build/esp32/bin/spider/runtime/cpu/CPU.o
new file mode 100644
index 0000000..7ec5a86
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diff --git a/build/esp32/bin/spider/runtime/instr/Instr_00-1F.o b/build/esp32/bin/spider/runtime/instr/Instr_00-1F.o
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index 0000000..2bd1f92
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diff --git a/build/esp32/bin/spider/runtime/math/Quat.o b/build/esp32/bin/spider/runtime/math/Quat.o
new file mode 100644
index 0000000..44f83c4
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diff --git a/build/esp32/bin/spider/runtime/memory/ByteArray.o b/build/esp32/bin/spider/runtime/memory/ByteArray.o
new file mode 100644
index 0000000..9c17633
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diff --git a/build/esp32/bin/spider/runtime/memory/RAM.o b/build/esp32/bin/spider/runtime/memory/RAM.o
new file mode 100644
index 0000000..1ea50fa
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diff --git a/build/esp32/bin/spider/runtime/reel/InstrReel.o b/build/esp32/bin/spider/runtime/reel/InstrReel.o
new file mode 100644
index 0000000..9b89f16
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diff --git a/build/esp32/bin/spider/runtime/reel/InstrReelDyn.o b/build/esp32/bin/spider/runtime/reel/InstrReelDyn.o
new file mode 100644
index 0000000..17d3eeb
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diff --git a/build/esp32/bin/spider/runtime/reel/InstrReelFixed.o b/build/esp32/bin/spider/runtime/reel/InstrReelFixed.o
new file mode 100644
index 0000000..060a1f7
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diff --git a/build/esp32/gen_makefile.py b/build/esp32/gen_makefile.py
new file mode 100644
index 0000000..7f7c5b4
--- /dev/null
+++ b/build/esp32/gen_makefile.py
@@ -0,0 +1,69 @@
+tab = '\t'
+dollar = '$'
+
+content = f"""# ========================================================== #
+# Spider Runtime - ESP32 Build System                        #
+# Toolchain: Espressif ESP-IDF (xtensa-esp-elf-g++)          #
+# ========================================================== #
+
+CC          := xtensa-esp-elf-g++
+TARGET      := spider_esp32.elf
+SRCDIR      := ../../src
+BUILDDIR    := bin
+TARGETDIR   := out
+SRCEXT      := cpp
+OBJEXT      := o
+
+ESP_FLAGS   := -DESP32 -DSPIDER_DISTRO_MICRO -DSPIDER_OS_NONE -mlongcalls -ffunction-sections -fdata-sections -fno-exceptions -fno-rtti
+
+CFLAGS      := -Wall -std=c++20 -DSPIDER_COMPILING {dollar}(ESP_FLAGS)
+LFLAGS      := -Wl,--gc-sections -mlongcalls
+INC         := -I../../src/
+
+# Exclude desktop-only modules
+EXCLUDE     := {dollar}(SRCDIR)/spider/runtime/util/Terminal.cpp \\
+               {dollar}(SRCDIR)/spider/runtime/debug/LiveDebug.cpp \\
+               {dollar}(SRCDIR)/spider/SpiderRuntime.cpp
+
+# ESP32 specific entry point (local to this build folder)
+EXTRA       := ./main_esp32.cpp
+
+SOURCES     := {dollar}(filter-out {dollar}(EXCLUDE), {dollar}(shell find {dollar}(SRCDIR) -type f -name "*.{dollar}(SRCEXT)" 2>/dev/null)) {dollar}(EXTRA)
+OBJECTS     := {dollar}(patsubst ./%,{dollar}(BUILDDIR)/%,{dollar}(patsubst {dollar}(SRCDIR)/%,{dollar}(BUILDDIR)/%,{dollar}(SOURCES:.{dollar}(SRCEXT)=.{dollar}(OBJEXT))))
+
+all: directories {dollar}(TARGET)
+{tab}@echo "Build complete: {dollar}(TARGETDIR)/{dollar}(TARGET)"
+
+remake: cleaner all
+
+directories:
+{tab}@mkdir -p {dollar}(TARGETDIR)
+{tab}@mkdir -p {dollar}(BUILDDIR)
+
+clean:
+{tab}@{dollar}(RM) -rf {dollar}(BUILDDIR)
+
+cleaner: clean
+{tab}@{dollar}(RM) -rf {dollar}(TARGETDIR)
+
+{dollar}(TARGET): {dollar}(OBJECTS)
+{tab}@echo "Linking {dollar}(TARGET)..."
+{tab}{dollar}(CC) {dollar}(LFLAGS) -o {dollar}(TARGETDIR)/{dollar}(TARGET) {dollar}^
+{tab}@echo "Done!"
+
+{dollar}(BUILDDIR)/%.{dollar}(OBJEXT): {dollar}(SRCDIR)/%.{dollar}(SRCEXT)
+{tab}@mkdir -p {dollar}(dir {dollar}@)
+{tab}@echo "Compiling {dollar}<..."
+{tab}{dollar}(CC) {dollar}(CFLAGS) {dollar}(INC) -c -o {dollar}@ {dollar}<
+
+{dollar}(BUILDDIR)/%.{dollar}(OBJEXT): ./%.{dollar}(SRCEXT)
+{tab}@mkdir -p {dollar}(dir {dollar}@)
+{tab}@echo "Compiling {dollar}<..."
+{tab}{dollar}(CC) {dollar}(CFLAGS) {dollar}(INC) -c -o {dollar}@ {dollar}<
+
+.PHONY: all remake clean cleaner
+"""
+
+with open('Makefile', 'w', newline='\n') as f:
+    f.write(content)
+print("Makefile generated successfully!")
diff --git a/build/esp32/main_esp32.cpp b/build/esp32/main_esp32.cpp
new file mode 100644
index 0000000..8925e2e
--- /dev/null
+++ b/build/esp32/main_esp32.cpp
@@ -0,0 +1,8 @@
+// ESP32 entry point for Spider Runtime
+// This replaces SpiderRuntime.cpp for microcontroller builds
+#include <spider/SpiderRuntime.hpp>
+
+int main() {
+    // TODO: initialize Spider runtime for ESP32
+    return 0;
+}
diff --git a/build/esp32/out/spider_esp32.elf b/build/esp32/out/spider_esp32.elf
new file mode 100644
index 0000000..c764849
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