Bootloader/ U-boot Porting Engineer

X4 Technology; Polska; Remote; PLN 421,000 - 722,000; Full time

Job summary

X4 Technology is seeking a Contract Embedded Engineer to port U-Boot and Trusted Firmware-A on new Cortex-A SoCs. This fully remote role is open to candidates across Europe, with a start target in January and a single Teams interview.

You will own porting work across the full boot chain, from SPL to OS, including EL3/PSCI/SMC handling and TrustZone integration. Real hands-on porting is essential; CVs without hands-on porting will not match.

Qualifications

• Proven hands-on U-Boot porting and bring-up on a new SoC.
• Extensive TF-A experience on Cortex-A platforms.
• Strong C and ARMv8 low-level debugging skills.
• Upstream contributions to U-Boot or TF-A are a plus.
• Based in Europe and eligible for a remote contract.

Responsibilities

• Port U-Boot to new silicon including SPL and DDR init.
• Bring up the boot chain from SPL to the OS.
• Port TF-A (BL1/BL2/BL31) on Cortex-A MPU incl EL3/PSCI/SMC.
• Assist secure-world integration and chain-of-trust.

Skills

U-Boot porting

TF-A

ARMv8

C programming

Security/TrustZone

Job description

Contract Embedded Engineer: U-Boot / TF-A Bootloader Porting (Remote, Europe, Outside IR35)

We're recruiting for a global semiconductor leader that needs a hands-on bootloader engineer to port and bring up U-Boot and Trusted Firmware-A on new high-end Cortex-A SoCs.

The essentials

• Contract starting around early January
• Fully remote, anywhere in Europe
• One stage only: a single technical interview on Teams

What you'll be doing

• Porting U-Boot to new silicon: SPL, DDR initialisation and board bring-up, not just config changes
• Working across the full boot chain, from first-stage loader through to the OS
• Porting and maintaining TF-A (BL1/BL2/BL31) on a Cortex-A MPU, including EL3, PSCI and SMC handling
• Secure-world integration (TrustZone, OP-TEE) and chain-of-trust work

What we’re looking for

• Genuine U‑Boot porting and bring‑up on a new SoC. We want to hear which SoC and which parts you personally owned
• Real TF‑A experience on a high‑end Cortex‑A platform (not Cortex‑M)
• Strong C and ARMv8 low‑level debugging
• Upstream contributions to U-Boot or TF-A are a big plus
• Based in Europe

This is a specialist role and the bar is high. Application‑level work, board‑config‑only changes, MCU‑only experience and keyword‑only CVs won’t be a match, so please apply only if you have done the porting yourself.

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