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emnify

Senior Software Engineer (SmartCard Development)

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Remote from
Germany, Poland
Salary
Undisclosed
Department
Software Engineering
Employment
Full Time
Experience
Senior
Published
Apply before
19 Oct 2026
Listing views
1,181
Application actions
59
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AI Summary

The role, at a glance.

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

4/5
EasyHard

Pace & Pressure

3/5
RelaxedFast-paced

Autonomy Level

4/5
GuidedFull ownership

Communication Load

3/5
IndependentCollaborative
AI insightSmartCard development is a specialized engineering domain involving security-sensitive protocols, constrained environments, and careful interoperability testing. Seniority implies independent technical decision-making and responsibility for robust production outcomes.

Salary analysis

Estimated compensation compared with the broader US market for similar roles.

Estimated job medianMarket rate
$155,000
US market range$135k–$180k
AI insightNo candidate compensation is disclosed in the posting. The figures shown are estimated annual USD base-salary benchmarks for a senior smart-card/embedded software engineer in the US market; actual compensation may vary by technical specialization, company stage, and location.

Core skills

Skills and capabilities most closely associated with this opportunity.

SmartCard developmentEmbedded softwareSecure software engineeringSoftware architectureCryptography fundamentalsAPDU protocolsJava CardC/C++Systems integrationAutomated testing
Sample interview questions
Describe a SmartCard or secure-element project you delivered and the technical challenges involved.

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.

How would you design secure communication between a host application and a SmartCard?

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.

How do you debug an issue that occurs only on a physical card or hardware reader?

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.

What practices do you use to maintain quality in security-sensitive low-level software?

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.

How do you make architectural decisions when balancing security, compatibility, and delivery timelines?

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.

This analysis is generated from the job description. Salary estimates, role characteristics and sample answers are guidance, not employer-provided facts.
Opportunity details

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