About this role.
This is a full-time Senior Software Engineer role focused on SmartCard development at emnify. The position is located in Berlin, Germany, with remote work indicated for Germany. Although the job description contains no substantive responsibilities, the title suggests ownership of secure embedded software and smart-card-related integrations. A successful candidate will likely bring senior-level engineering judgment, security awareness, and experience delivering reliable low-level or device-facing software.
Role DNA
A quick view of the complexity, pace, ownership and collaboration implied by the job description.
Job Complexity
4/5Pace & Pressure
3/5Autonomy Level
4/5Communication Load
3/5Salary analysis
Estimated compensation compared with the broader US market for similar roles.
Core skills
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Cover letter sample
Dear Hiring Team,
I am excited to apply for the Senior Software Engineer (SmartCard Development) position at emnify. My senior engineering background combines secure software development, systems-level problem solving, and a disciplined approach to reliability and testing. I would welcome the opportunity to help build robust SmartCard capabilities while collaborating effectively with product and engineering stakeholders.
Thank you for your consideration; I look forward to discussing how my technical judgment and ownership mindset can support emnify's team.
Sample interview questions
I would explain the card platform, protocols, security requirements, my ownership areas, and measurable delivery results. I would also discuss how I validated interoperability and handled constraints such as memory, performance, and transaction reliability.
I would begin with a threat model, then use established cryptographic protocols and mutual authentication where appropriate. I would protect keys, validate all inputs and APDU responses, manage replay protection, and ensure failures do not expose sensitive data.
I would first create a minimal reproducible transaction sequence and collect APDU traces, device logs, and version details. I would compare behavior across card batches, readers, firmware, and host environments, then isolate the fault with targeted tests before implementing and verifying a fix.
I use clear interface contracts, code reviews, static analysis, automated unit and integration testing, and negative-path testing. For security-critical changes, I also document assumptions, review cryptographic usage carefully, and test against malformed or unexpected inputs.
I identify the non-negotiable security and compliance requirements first, then evaluate options against interoperability, maintainability, and delivery risk. I communicate trade-offs early, document the decision, and use phased implementation or prototypes when uncertainty is high.
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Annual salary information is not provided for this position. Explore salary ranges for similar roles in our Salary Directory ›
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