15 days ago
Englewood, CO, USASenior
Base Salary
$104k - $118k/yr
Responsibilities
- Design, develop, debug, and maintain embedded C firmware for OpenWrt-based ARM/MIPS residential gateways.
- Develop OpenSync managers and OVSDB-based cloud configuration and telemetry reporting.
- Implement LTE/5G failover, fallback, modem management, route arbitration, WAN health checks, and recovery state machines.
- Configure WiFi radios and troubleshoot Qualcomm, Broadcom, and Atheros wireless drivers.
- Debug Linux kernel, PCIe, USB, networking, driver, crash, and field issues using logs, crash dumps, and remote diagnostics.
- Implement secure TLS/mTLS cloud connectivity, GRE/IPsec tunnels, OpenWrt initialization and configuration handlers, factory reset, firmware upgrade, and persistent storage functionality.
- Write unit tests, participate in GitLab merge requests, and collaborate with hardware, QA, cloud platform, and service provider teams.
Requirements
- At least 5 years of embedded C development experience on Linux-based platforms.
- Strong C programming skills, including pointers, memory management, IPC, and event-driven architectures.
- Experience with OpenWrt build systems, package management, UCI, JFFS2, and SquashFS.
- Experience with OpenSync or similar cloud-managed CPE frameworks, including OVSDB, protobuf, and MQTT telemetry.
- Experience integrating cellular modems using AT commands, QMI, network interface management, USB, and PCIe/MHI.
- Strong understanding of Linux networking, routing, IPv4/IPv6, DHCP, SLAAC, prefix delegation, netfilter, bridges, TLS, X.509 certificates, GRE, IPsec, VPN overlays, and secure encapsulation.
- Experience with event loop frameworks such as libev or libuv and debugging tools including GDB, strace, tcpdump, valgrind, kernel logs, and serial consoles.
- Proficiency with Git, GitLab CI/CD, cross-compilation toolchains, Shell scripting, and Python test automation.
- Understanding of WiFi standards and wireless driver configuration, including 802.11ax/be.
- Preferred qualifications include Qualcomm IPQ or Broadcom BCM SoC experience, DOCSIS, eSIM/eUICC, carrier aggregation, NR5G, TR-069/TR-369, TR-181, Kconfig, flash storage, thermal and power management, hardware bring-up, BSP development, and ISP/MSO/OEM collaboration.
Benefits
- Onsite work arrangement.
- Base salary of $104,000–$118,000 per year plus a cost-of-living allowance and bonus.
- Medical, dental, vision, and life insurance.
- Paid holidays, paid time off, and paid parental leave.
- 401(k) plan and contributions.
- Long-term and short-term disability coverage.
- Employee Stock Purchase Plan.
About Cognizant
Cognizant (Nasdaq: CTSH) is an AI Builder and technology services provider, bridging the gap between AI investment and enterprise value. We build full-stack AI solutions powered by deep industry, process and engineering expertise — embedding an organization's unique context into technology systems that amplify human potential and drive tangible outcomes. From strategy to deployment, we help global enterprises move from AI ambition to AI impact and stay ahead in a fast-changing world. See how at cognizant.ai | Follow us @cognizant