Software Engineer

We’re opening the position of a Software Engineer / Software Architect to work on the project of our Client — a German manufacturer of ticket validation and issuing devices for public transport, who is building a standalone, reusable C++ module that implements the etiCORE e-ticketing standard. The module will expose a clearly defined HTTP/JSON API and run on ARM-based Embedded Linux devices, largely independent of the existing device software.

You will join a small team consisting of one internal Client’s Software Engineer and two external Software Engineers. As the Senior Software Engineer, you will lead technical architecture and design while staying hands-on in implementation and testing. The goal is a maintainable solution that the Client can support and extend on their own after the project ends.

Responsibilities:

• Analyze etiCORE specifications and identify the functionality needed for ticket validation and issuance
• Design a modular, maintainable, and testable C++ architecture
• Define the HTTP/JSON API and module boundaries together with the Client
• Implement etiCORE processes, data formats, protocols, and verification mechanisms in modern C++
• Integrate cryptographic functionality and interfaces to security components such as SAMs
• Build robust error handling, diagnostics, and logging for resource-constrained ARM devices
• Develop automated unit and integration tests with traceability to requirements
• Apply secure coding practices, static analysis, and dependency vulnerability scanning, with EU Cyber Resilience Act (CRA) requirements in mind
• Document architecture, interfaces, dependencies, and build process; provide OpenAPI documentation
• Lead code reviews and technical discussions, and guide the mid-level Software Engineer
• Support integration, conformance testing, and handover to the Client’s team

Requirements:

• Extensive professional experience in developing complex systems in modern C++, preferably C++17 or newer
• Proven experience with object-oriented design and modular, maintainable, and testable software architectures
• Strong knowledge of cryptographic principles, digital signatures, certificates, and PKI
• Experience with cryptographic libraries such as OpenSSL and secure key management
• Experience in developing or integrating security-sensitive components and communication protocols
• Experience with Linux development, CMake or comparable build systems, and Git
• Automated testing experience, preferably with Google Test or Catch2
• Knowledge of HTTP-based APIs, JSON, and REST-oriented interfaces
• Experience in processing binary data formats
• Understanding of concurrency, asynchronous processing, robust error handling, and secure software development
• Ability to analyze technical specifications, assess technical risks, evaluate architectural alternatives, and document pragmatic design decisions
• Experience in conducting technical reviews and providing guidance within small Development teams
• Independent, structured working style, strong collaboration skills, and a proactive approach to knowledge sharing
• Very good German or English communication skills
• English level — Upper-Intermediate or higher

Will be a plus (candidates are not expected to cover all desirable qualifications):

• Expertise with VDV Core Application (VDV-KA), etiCORE, or electronic ticketing systems
• Knowledge of smartcards, ISO/IEC 7816, NFC, or ISO/IEC 14443
• Understanding of Secure Access Modules (SAM) or Hardware Security Modules (HSM)
• Ability to work with ASN.1, TLV, or comparable binary data structures
• Skills with Embedded Linux and cross-compilation for ARM platforms
• Experience with Docker, Podman, or comparable reproducible Development and Test environments
• Understanding of SBOM, vulnerability management, and CRA-related security requirements

We offer:

• Remote-first work model with flexible working hours (we provide all equipment)
• Comfortable and fully equipped offices in Lviv and Rzeszów
• Competitive compensation with regular performance reviews
• Referral Bonus Program
• 18 paid vacation days per year
• 12 days of paid sick leave per year
• Extra paid leave (blood donation, marriage, childbirth, etc.)
• Health & wellness support: either a monthly budget for medical insurance and sports activities, or a full medical insurance plan, depending on your cooperation model
• Mental Health Program — company-covered psychologist consultations, with an annual coverage limit
• English, German, and Polish language courses and Speaking Clubs
• Corporate merch gifts for your special dates
• Corporate subscription to learning platforms, regular meetups and webinars
• Friendly team that values accountability, innovation, teamwork, and customer satisfaction
• Maternity leave
• Inclusive environment where everyone feels valued and treated equally. We proudly partner with VeteranHub to support Ukrainian veterans
• We are committed to supporting Ukraine and actively participate in charity initiatives

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