Must have

• Embedded C

• OpenWRT

• Git

• Switches

• SMD

• Cryptography

• C++

• English

Nice to have

• Testing

• Embedded system

• Prototyping

Requirements description

• 3+ years of experience in embedded C/C++ development (STM32, ESP32, or similar MCUs).
• Hands-on experience with RF modules (LoRa/SX127x) and understanding of FHSS/PRNG principles for hopping.
• Solid knowledge of modern cryptography, including: AEAD (ChaCha20-Poly1305 or AES-GCM), KDF (HKDF, PBKDF2, Argon2), ECDH (Curve25519/X25519)
• Experience with Betaflight (forking/patching) or ArduPilot, including code modification and target builds.
• Familiarity with Linux / embedded Linux (OpenWRT, Buildroot) and experience working with gstreamer / ffmpeg for streaming applications.
• Proficiency with Git and CI/CD for embedded builds.
• Understanding of radio regulations (duty cycle, permitted frequency bands) — or readiness to learn and comply.
• Basic understanding of hardware schematics: power switches, isolation, relays, and basic SMD soldering for rapid prototyping.
• Technical English — Intermediate+ (able to read documentation and work with upstream projects).

Preferred Qualifications

• Experience developing for OpenIPC or working with camera SoCs.
• Background in creating MSP/CRSF/Telemetry integrations for flight controllers.
• Practical experience in RF link testing (spectrum, BER/RSSI analysis).
• Experience with libsodium, mbedTLS, or OpenSSL on embedded systems.

Your responsibilities

1. Develop and integrate cryptographic procedures for ELRS: bind phrase encryption, KDF implementation, ECDH/session key replacement, and secure frame handling.
2. Implement and test FHSS / frequency hopping algorithms — manual and automatic frequency change modes, with adaptation for SX127x / SX128x / LR1122 / LLCC68 and other RF chips.
3. Adapt and extend Betaflight: add custom MSP/CLI commands, modify flight constraints (arming, angle limits), implement additional AUX modes, and enhance OSD telemetry.
4. Configure and improve OpenIPC: optimize video streaming (RTSP/OSD), REST/API endpoints, Wi-Fi STA/AP profiles, watchdog systems, and logging mechanisms.
5. Develop firmware for custom MCU control boards (STM32/ESP32): manage relays/SSRs/indicators, implement safety interlocks and fail-safe logic.
6. (Safety disclaimer - no instructions or activities related to harmful or explosive devices.)

show all (7)