MICROTECH GLOBAL LTD
Kernel Engineer
Cambridge
Posted about 9 hours ago
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Job Title: Principal Kernel Engineer
Our client are an international semiconductor and consumer electronics company.
The Role
- Optimize memory management internals: buddy allocator, slab/SLUB, page reclaim and LRU/MGLRU, memory compaction and defragmentation, transparent huge pages, page-fault and TLB-shootdown paths, copy-on-write behaviour
- Drive scheduler performance: run-queue and load-balancing behaviour, energy-aware scheduling, wakeup latency, task placement on heterogeneous (big.LITTLE/DynamIQ) topologies, cpufreq/cpuidle governor interaction
- Optimize synchronization primitives and lock-heavy paths: futex fast/slow paths, mutexes and rwsems, spinlocks/qspinlocks, RCU, seqlocks, per-CPU data, memory ordering and barriers on ARM64
- Analyse and improve IPC and syscall paths: context-switch cost, binder-style IPC, shared memory, vDSO, interrupt/softirq handling
- Identify bottlenecks on flagship mobile workloads (gaming, day-of-use, camera, AI inference) using PMU counters, ftrace/perf, eBPF, lockdep/lockstat, and power measurement with mA/mAh attribution
- Land production-quality kernel patches from hypothesis through benchmarking to ship, with measured latency and energy impact
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Must-Haves
- 10+ years of OS kernel development in C (Linux or comparable), with patches shipped to production systems at scale
- Expert-level understanding of MM internals: physical/virtual memory management, buddy and slab allocation, reclaim, compaction, page tables, TLB management
- Deep scheduler knowledge: CFS/EEVDF internals, load balancing, preemption, real-time classes, energy-aware scheduling
- Mastery of kernel synchronization: locking primitives, RCU, lock-free techniques, the ARM64 memory model and barrier semantics
- Proven kernel performance-analysis skills: PMU counters, ftrace/perf, eBPF, lock contention and latency analysis
- Strong ARM64 architecture grounding: exception levels, cache hierarchy and maintenance, TLBs, memory ordering
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Skills
Kernel Development
Memory Management
Scheduler Performance
Synchronization Primitives
Performance Analysis
ARM64 Architecture
C Programming
IPC
Syscall Optimization
Bottleneck Identification
Energy-Aware Scheduling
Real-Time Scheduling
Lock-Free Techniques
Benchmarking
Mobile Workloads
Power Measurement