(Senior) Self Sovereign Identity and Wallets Engineer (m/f/x)

Cofinity-X GmbH; Köln; Hybrid; EUR 70,000 - 100,000; Full time

Benefits offered by this job

Hybrid work

Training budget 1500 EUR

Hardware freedom

Lunch subsidy

Deutschland Ticket

Job Bike

Workation EU

Pension scheme

Team events

Cologne Office View

Job summary

Cofinity-X GmbH is building scalable backend services for digital identity and wallet components. We are seeking a backend engineer to design, implement, and maintain core services in an agile environment.

You will work on secure wallet functionality, API design, and interoperability with Gaia-X and Catena-X standards, collaborating with architects and product teams. The role emphasizes reliability, security, cloud-native architectures, and a collaborative mindset, with opportunities for growth

Qualifications

• Several years of experience as a backend or software engineer in an agile environment.
• Hands-on experience with identity/credential tech (SSI, DIDs, VC, wallets) is a strong plus.
• Strong programming skills in Java or C# .NET
• Solid understanding of cryptography, secure API design, and data protection
• Experience with cloud-native architectures, containerization, and CI/CD pipelines
• Familiarity with Gaia-X/Catena-X standards
• Analytical and structured working style with strong problem-solving skills and a collaborative mindset

Responsibilities

• Design, develop, and maintain core backend services for digital identity and wallet components.
• Implement and operate secure, standards-compliant wallet functionality within our platform.
• Ensure reliability, scalability, and security of core services that other product components depend on.
• Collaborate with architects and product teams to translate technical and regulatory requirements into robust implementations.
• Contribute to API design and integration patterns for wallet and identity-related services.
• Participate in code reviews, technical design discussions, and continuous improvement of engineering practices.
• Monitor, troubleshoot, and resolve issues in core services, ensuring high availability and data integrity.
• Stay current with Gaia-X and Catena-X standards and help shape their implementation.

Skills

Backend engineer experience

Identity/credential tech

Java/C# .NET

Crypto & security

Cloud-native & Docker/Kubernetes

Gaia-X/Catena-X familiarity

Analytical mindset

Team collaboration

Tools

Docker

Kubernetes

Job description

Our vision - your future

Cofinity-X is a joint venture founded in 2023 by BASF, BMW Group, Henkel, Mercedes-Benz, SAP, Schaeffler, Siemens, T-Systems, Volkswagen, and ZF. Established by industry experts, our company is primed for growth and is intended to be further led by professionals like yourself.

Your mission

• Design, develop, and maintain core backend services, with a focus on digital identity and wallet-related components
• Implement and operate secure, standards-compliant wallet functionality (e.g. credential issuance, verification, and storage) within our platform
• Ensure the reliability, scalability, and security of core services that other product components depend on
• Collaborate with architects and product teams to translate technical and regulatory requirements (e.g. self-sovereign identity, decentralized identifiers, verifiable credentials) into robust implementations
• Contribute to API design and integration patterns for wallet and identity-related services
• Participate in code reviews, technical design discussions, and continuous improvement of engineering practices
• Monitor, troubleshoot, and resolve issues in core services, ensuring high availability and data integrity
• Stay current with relevant standards and specifications (e.g. Gaia-X, Catena-X, W3C DID/VC) and help shape their implementation through participation in working groups, expert groups and committees as required.

Your profile

• Several years of experience as a backend or software engineer in an agile development environment
• Hands-on experience with identity and credential technologies such as SSI, DIDs, verifiable credentials, or digital wallets is a strong plus
• Strong programming skills in (preferably) Java, or C# .NET
• Solid understanding of cryptography fundamentals, secure API design, and data protection principles
• Experience with cloud-native architectures, containerization (Docker/Kubernetes), and CI/CD pipelines
• Familiarity with relevant standards bodies and specifications (e.g. Gaia-X, Catena-X) is beneficial
• Analytical and structured working style with strong problem-solving skills and a collaborative, team-oriented mindset

Why us?

• Hybrid working model
• Work-life balance with flexible working hours
• Annual training budget for continuous professional and personal development (1.500 EUR)
• Free choice of hardware
• Monthly lunch subsidy (up to 115 EUR)
• Deutschland Ticket and Job Bike for environmentally friendly mobility options
• Workation to work remotely from different locations within the EU
• We offer every employee a pensions scheme (bAV) with company sponsorship
• Regular team events to strengthen cohesion and foster a positive working atmosphere
• A modern office with an impressive view of the Cologne Cathedral