{"id":2339778,"url":"https://alion.io/job/apple-embedded-5g4g-cellular-physical-layer-data-path-signal-processing-firmware-engineer-3","title":"Embedded 5G/4G Cellular Physical Layer Data Path Signal Processing Firmware Engineer","company":{"id":12,"name":"Apple","domain":"apple.com","url":"https://alion.io/company/apple","size_band":"5000+","is_staffing_agency":false,"employer_type":"direct","is_intermediary":false,"listed_via":null,"ats_vendor":"Apple Jobs","truth_index":{"grade":"B","score":78,"open_postings":993,"ghost_share":0,"stale_share":0.887,"repost_share":0,"time_to_fill_p50_days":45,"computed_at":"2026-10-15T05:46:00Z"}},"role":"Hardware","role_family":"Hardware","seniority":"staff","employment_type":null,"work_mode":"on_site","remote_scope":null,"remote_scope_basis":null,"remote_working_hours":null,"hiring_geo_confidence":"structured","locations":["San Diego, United States"],"countries":["US"],"hiring_countries":[],"hiring_countries_total":0,"salary":null,"salary_estimate":{"min_usd":244000,"max_usd":442000,"period":"year","method":"role_seniority_country_remote_cell","sample_n":492},"experience_years_min":10,"visa_sponsorship":false,"relocation_package":false,"has_equity":false,"technologies":[{"name":"C++","optional":false},{"name":"Python","optional":false},{"name":"Machine Learning","optional":true},{"name":"RTOS","optional":true}],"status":"live","first_seen_at":"2026-06-10T02:10:56Z","employer_posted_date":"2026-10-12","last_verified_at":"2026-10-15T05:05:04Z","board_verified":true,"closed_at":null,"days_open":127,"trust":{"level":"stale","repost_count":0,"flags":["stale"],"days_open":127},"description":"Apple is where individual imaginations gather together, committing to the values that lead to great work. Every new product we build, service we create, or Apple Store experience we deliver is the result of us making each other’s ideas stronger. That happens because every one of us shares a belief that we can make something wonderful and share it with the world, changing lives for the better. It’s the diversity of our people and their thinking that inspires the innovation that runs through everything we do. When we bring everybody in, we can do the best work of our lives. Here, you’ll do more than join something - you’ll add something.\nAs a Wireless Embedded Physical Layer Data Path Signal Processing Firmware Engineer on this team, you will be at the center of the embedded 4G/5G/6G multimode cellular firmware effort within a silicon design group responsible for crafting and productizing powerful cellular SoCs. This position requires someone comfortable with all aspects of embedded software development, has experience writing firmware, which is tightly coupled to hardware, is not afraid to debate ideas openly, and is flexible enough to shift on constantly evolving requirements.\nDescription\nImplement cellular physical layer algorithms on digital/vector signal processors with tight time, latency, memory and energy budgets by interfacing to specialized cellular ASIC hardware.\nIf you have strong hardware programming understanding, you will implement firmware which implements 3GPP channels and procedures such as: PDCCH, PDSCH, PBCH PUCCH, PUSCH, PRACH UL/DL HARQ.\nIf you have linear algebra and signal processing understanding, you may implement some of the following:\nChannel Estimation\nChannel State Feedback\nInterference Cancellation\nCell Search and Measurement\nBeam Measurement\nWork with systems engineers to refine signal processing algorithms for efficient firmware/hardware execution\nSpecify, design, and implement the firmware architecture for superior power, performance, and cost.\nAnalyze, refine and implement fixed-point firmware and validate bit-exactness to the algorithmic reference\nAssist in the development on pre-silicon emulation systems/virtual platforms and use them for verification.\nEvaluate and implement groundbreaking tools for build, formal verification and test.\nDefine methodologies and standard processes\nMinimum Qualifications\nBS and a minimum of 10 years relevant industry experience.\nExperience either with implementing digital signal processing algorithms using special purpose digital/vector signal processing HW -OR- wireless physical layer channels by interfacing to special purpose hardware.\nDeep understanding of software engineering principles, and core computer science fundamentals.\nFundamental facility with C and C++, compilers, build and source code control tools.\nExperience with silicon prototyping, emulation systems, and 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