Location
In office (Beijing)
Seniority
Middle · 3+ years exp
Employment
Full-Time
Confirmed on the employer's own hiring board on Oct 19, 2026. First seen by Alion on Oct 16, 2026. StepFun scores B on the Alion truth index.
Overview
Company
Impact
Profile match
StepFun is a Chinese foundation model laboratory building a full range of models from language to speech, image and video. Its Step series includes very large mixture of experts models and multimodal systems, and the company releases open weights alongside commercial offerings. The laboratory was founded by a former senior Microsoft executive and is among the most heavily funded of the Chinese model startups; its models are used in Chinese consumer applications and enterprise deployments across several industries.
Backed by Qiming Venture Partners
岗位职责
- 内核核心子系统研发。 负责调度器(CFS/EAS、调度延迟与优先级)、内存管理(THP、内存分层、回收策略、NUMA balancing)、网络栈(RoCE 与 TCP、拥塞控制、XDP/eBPF)、I/O 栈(io_uring、blk-mq、NVMe 多队列)与文件系统(ext4、overlayfs 及分布式文件系统客户端)的特性开发与缺陷修复。
- AI 与 HPC 场景性能优化。 降低调度与 I/O 的尾延迟抖动,优化大页、内存带宽与 NUMA 亲和; 改进 CPU 亲和与隔离、中断与软中断处理; 优化 RDMA 内核旁路路径与驱动的协同,以及 GPUDirect、NVMe-oF、GPU Direct Storage 等主机侧数据通路。
- 大规模集群稳定性治理。 定位并修复 panic、hung task、soft lockup、OOM、内存泄漏等疑难问题,完成 crash dump 与 vmcore 分析; 建设 kprobe、ftrace、eBPF 工具链,形成线上问题的根因分析与闭环修复机制。
- 版本与发行版工程。 负责内核版本选型、CVE 修复、补丁管理与 backport,参与龙蜥(Anolis)、openEuler 及上游社区贡献,保持内部版本与社区的同步演进。
- 虚拟化与轻量隔离优化。 负责 KVM/QEMU、Kata Containers等虚拟化与虚拟化容器方案的内核侧支撑,优化 vCPU 调度与抢占、内存虚拟化(EPT/NPT、virtio-balloon、DAX 大页)以及 virtio、vhost-net/vhost-user 数据通路,压降虚拟化开销。
- 容器运行时与安全加固。 负责 runc/containerd、cgroup v2、namespace的内核侧支撑,推进 livepatch/kpatch 热升级能力,收敛多租户与不可信代码执行场景下的内核攻击面。
- 硬件平台适配。 支持新服务器平台的 BSP 适配,覆盖 x86、ARM 及国产 CPU 平台,完成网卡、存储、GPU 驱动与 ACPI/BIOS/BMC 固件的联调。
- 技术沉淀与输出。 建设内核知识库与性能调优指南,承担内部培训,推动专利、技术文章与社区影响力建设。
- Agentic 负载内核支撑。 面向 Agent 编排产生的大量短生命周期沙箱与容器实例,优化 fork/exec、namespace 建立、cgroup 挂载等创建与销毁路径,改进 overlayfs、erofs 及按需加载(lazy loading)的镜像挂载效率,缩短沙箱冷启动时间; 治理秒级启停节拍下的 PID 与 inode 泄漏、临时文件系统压力及 page cache 抖动。
- GPU 与加速器虚拟化。 支撑 GPU/NPU 的多租户切分与共享,参与 vGPU、MIG、SR-IOV 及基于 vfio 的用户态驱动直通方案的内核适配; 优化设备直通下的中断亲和、IOMMU 映射与 NUMA 亲和,保障虚拟化环境中的算力供给与 RDMA 通信性能。
- Agentic 沙箱安全治理。 面向 Agent 大规模执行不可信代码的场景,设计并落地沙箱安全策略:按 Agent 类型细化 seccomp 与 LSM 规则集,管控 namespace 逃逸面与内核接口暴露,配合安全团队完成漏洞响应、攻击样本分析与加固基线沉淀。
任职要求
- 3 年以上 Linux 内核或系统级软件开发经验,在调度、内存、网络、存储等子系统中至少一个有深度积累,有合入上游 kernel 或主流发行版的 patch 记录。
- 精通 C 语言与内核编程模型,深入理解并发原语、锁机制、内存序与 RCU; 能熟练阅读 x86_64 或 arm64 汇编。
- 熟练使用 perf、ftrace、bcc/bpftrace、crash、gdb、systemtap 等工具,具备独立定位线上疑难问题的能力。
- 理解计算机体系结构:缓存一致性、NUMA、PCIe、TLB、内存带宽与延迟; 理解 GPU 主机侧交互机制(GPUDirect RDMA、P2P、NVLink 与 PCIe 拓扑识别)。
- 深入理解 Linux 虚拟化栈(KVM、virtio、vhost、IOMMU、EPT/NPT)或容器隔离机制(namespace、cgroup v2)中的至少一个方向,并有生产环境的性能优化或问题治理经验。
- 理解 AI 推理服务与 Agent 编排的负载特征(短生命周期实例、冷启动敏感、请求规模混合),能够把负载特征转化为内核侧的优化目标与验收指标。
- 熟悉 RoCE/InfiniBand 协议栈与内核网络路径,有网络性能调优经验。
- 熟悉 Git 工作流与内核社区协作流程,了解 kernel selftest、0-day 与 syzkaller 等质量保障体系。
- 能流畅阅读英文技术文档与社区讨论,具备书面技术表达能力。
加分项
- 内核子系统 maintainer 或活跃贡献者。
- 有 AI/HPC 场景下的内核优化实战经验。
- 熟悉 eBPF 生态并有生产环境落地案例
- 有 KVM、Kata、或 Serverless 沙箱等轻量虚拟化方向的内核开发经验。
- 有 vGPU、MIG、SR-IOV 或 GPU 直通(vfio)适配和落地经验。
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