Manning Global, a premier global staffing and managed services provider, specializing in worldwide leading Industry sectors such as ICT, AI, Technology, Digital Media, Engineering, Automotive and Energy, is recruiting for a Principal Kernel Engineer on behalf of one of their top-tier international clients to join their organization in the UK.
Job Title
Principal Kernel Engineer
Employment
Full time
Start Date
July, 2026
Country
Cambridge, UK - Office based
Salary range
Dependant upon Experience
Key Responsibilities
- 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.
- Collaborate with CPU microarchitects on HW-SW co-design: exploit microarchitectural features in the kernel and shape future hardware through kernel-driven requirements.
This job description is only an outline of the tasks, responsibilities and outcomes required of the role. The jobholder will carry out any other duties as may be reasonably required by his/her line manager. The job description and personal specification may be reviewed on an ongoing basis in accordance with the changing needs.
Experience/Qualifications
- 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.
- 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.
Desired Skills
- Mobile power engineering: DVFS governors, cpuidle, per-workload energy attribution.
- Upstream Linux kernel contributions (mm, sched, locking, or related subsystems).
- Familiarity with HarmonyOS or Android common kernel.
- Exposure to CPU microarchitecture and cycle-accurate modelling (gem5).
- Experience with LLM/agentic tooling applied to systems software.
Principal Kernel Engineer in Cambridge employer: Manning Global AG
Manning Global AG is an exceptional employer that fosters a dynamic and collaborative work culture, perfect for those passionate about e-commerce and marketing. With a focus on employee growth, we offer comprehensive training and development opportunities, ensuring our team members thrive in their careers. Located in a vibrant area, our company provides unique advantages such as flexible working arrangements and a supportive environment that encourages innovation and creativity.
