Middle Software Engineer

3 days ago


Warszawa, Czech Republic Absolutelvizion Full time

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. ,[Develop and integrate cryptographic procedures for ELRS: bind phrase encryption, KDF implementation, ECDH/session key replacement, and secure frame handling., Implement and test FHSS / frequency hopping algorithms — manual and automatic frequency change modes, with adaptation for SX127x / SX128x / LR1122 / LLCC68 and other RF chips., Adapt and extend Betaflight: add custom MSP/CLI commands, modify flight constraints (arming, angle limits), implement additional AUX modes, and enhance OSD telemetry., Configure and improve OpenIPC: optimize video streaming (RTSP/OSD), REST/API endpoints, Wi-Fi STA/AP profiles, watchdog systems, and logging mechanisms., Develop firmware for custom MCU control boards (STM32/ESP32): manage relays/SSRs/indicators, implement safety interlocks and fail-safe logic., (Safety disclaimer - no instructions or activities related to harmful or explosive devices.), Conduct comprehensive testing (soak tests, replay/fuzz testing, RF performance analysis), prepare documentation and patches, and manage CI pipelines for firmware builds. ] Requirements: Embedded C, OpenWRT, Git, Switches, SMD, Cryptography, C++, Testing, Embedded system, Prototyping



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