Senior Embedded Linux Application Engineer (C++ / Yocto / Web UI)

About the role

Fresh is hiring a Senior Embedded Linux Application Engineer to join a nearshore engineering team in Costa Rica supporting a new product introduction for a global test and measurement leader: an ultra-low pressure primary calibration standard. You will own the architecture of the system software running the instrument on a headless NXP i.MX95-class embedded Linux computer, built on the client's in-house Yocto-based platform, replacing legacy Windows desktop applications. You will work with significant independence, supported by the client's ESW Product Owner and platform engineers.

Key responsibilities

• Set up the product project on the Yocto-based embedded Linux platform: product layer, image recipes, machine files and device tree for the SoM evaluation kit and custom carrier board.
• Integrate platform services (A/B software update, configuration, storage, diagnostics, identity/security) and enable verified (secure) boot.
• Develop C++ system software as separate Linux services (systemd, IPC): test sequences, instrument control, data logging, results and reports, and porting functionality from legacy VB6 desktop apps.
• Build a self-hosted web user interface (HTML, CSS, TypeScript, React or similar) and REST APIs, used locally in kiosk mode and from networked PCs.
• Implement communication with system instruments and customer devices over RS-232 and GPIB via USB adapters, including concurrent multi-device sessions.
• Implement security requirements from the product threat analysis: user accounts and roles, audit logging, HTTPS and mutual TLS, signed updates, service sandboxing, encrypted data, and security tests and fuzzing in CI.
• Implement the remote programming interface used by the client's calibration software.

Required profile

• 7+ years of embedded Linux software experience after a BS/MS in Computer Engineering, Computer Science or equivalent; senior level, able to own an application architecture.
• C++ application development for embedded Linux: services, IPC and systemd.
• Yocto Linux: product layers, recipes and BitBake builds, including building on an existing in-house Yocto platform.
• Web UI development (HTML, CSS, TypeScript) with a modern framework such as React.
• HTTP/REST API design and implementation.
• Secure application practices: authentication, role-based permissions, audit logging, signed updates, TLS/mutual TLS (OpenSSL), privilege separation and service sandboxing.
• English proficiency in speaking and writing.

Preferred qualifications

• Migrating legacy desktop application functionality to an embedded target.
• SWUpdate, dm-verity and secure boot on NXP i.MX processors.
• Instrument communication over RS-232, GPIB or SCPI.
• Secure coding (CERT C++), fuzzing and familiarity with IEC 62443-4-1.
• Experience in test and measurement or calibration software.
• Use of AI-assisted development tools within client policies.

What we offer

• Competitive salary.
• Training and development opportunities.
• Medical plan and English lessons.
• Collaborative work environment with schedule flexibility.