Software & Firmware Engineering
4 weeks ago
Magical Toys is a San Franciscobased startup crafting voice-first, connected play experiences. Our current platform centers on an ESP32-S3powered interactive toy with low-power wake-word, full-duplex audio, BLE/Wi-Fi onboarding, OTA updates, and delightful LED interactionsbuilt to be safe, resilient, and fun.
About the Role
Youll be the go-to firmware engineer advancing our ESP32 stack for real-time audio, connectivity, and low-power operation. Youll ship features that make our characters feel alive: reliable wake-word, smooth streaming, robust provisioning, and battery-friendly behaviors. Youll work closely with hardware, audio/DSP, and mobile to iterate rapidly on product.
What Youll Do
Develop and optimize ESP32 firmware (ESP-IDF + FreeRTOS) for connectivity, audio, and power management.
Implement and harden WiFi (802.11) features including provisioning, secure transport, and reconnection logic.
Integrate WebSockets (and related real-time channels) for low-latency device-cloud messaging.
Contribute to real-time audio features: IS pipeline, VAD/wakeword (e.g., WakeNet), buffering, and playback.
Enhance low-power behavior (light/deep sleep, wake sources) while meeting latency and UX targets.
Build and maintain BLE flows (e.g., first-time onboarding, device info, diagnostics).
Own OTA reliability (rollback, versioning, staged rollout) and on-device logging/metrics.
Debug with logic analyzers/J-Link/serial trace; write crisp documentation and code reviews; collaborate cross-functionally.
Required Qualifications
~35 years professional embedded experience (ESP32, STM32, nRF, or similar).
~ Strong C/C++ in RTOS environments; comfort with ESPIDF, FreeRTOS, CMake, and IDF Monitor.
~ Hands-on WiFi development (802.11), plus experience with real-time messaging (WebSockets/MQTT).
~ Familiar with voice/wakeword frameworks (e.g., WakeNet or equivalent) and IS audio basics.
~ Solid grasp of SPI/IC/UART and low-level bring-up.
~ Excellent problem-solving; thrives in a fast-paced, lab-centric, small-team setting.
Preferred Qualifications
IoT security: TLS, certificate provisioning, secure boot, and flash encryption.
Audio/DSP exposure: AEC/NS/AGC, streaming buffers, and clocking on constrained MCUs.
Real-time comms on embedded or at the edge (e.g., RTP/WebRTC on gateway, or similar architectures).
OTA pipelines at scale; factory firmware, self-test, or DFM/DFT collaboration.
Contributions to open source or demonstrable personal prototypes.
Why Join Magical Toys?
Ship tangible, joyful products that blend hardware, firmware, and a touch of wonder.
Tight feedback loops: on-bench testing, rapid iterations, and direct impact on user experience.
Supportive, collaborative team that values craft, balance, and growth.
Medical Insurance Provided to full-time staff
To apply
Send your resume and a brief note on your most relevant ESP32 work (links to repos/demos welcome) to [email placeholder]. Magical Toys is an equal opportunity employerdiversity and inclusion are core to how we build.
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