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

Cofinity-X; Köln; Hybrid; EUR 70,000 - 110,000; Full time

Benefits offered by this job

Hybrid working model

Annual training budget 1500 EUR

Free hardware selection

Monthly lunch subsidy

Deutschland Ticket and Job Bike

Workation within EU

Pensions scheme with company sponsor

Regular team events

Modern office with Cologne Cathedral视

Job summary

Cofinity-X in Cologne seeks an experienced backend engineer to design, develop, and maintain core services for identity and wallet components. You will work on secure wallet functionality and API design within a cloud-native platform.

Join a team that values collaboration, modern engineering practices, and ongoing learning while operating in a hybrid work environment with opportunities for professional growth.

Qualifications

• Several years of experience as 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 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 Gaia-X, Catena-X standards is beneficial.
• Analytical and structured working style with a collaborative, team-oriented mindset.

Responsibilities

• Design, develop, and maintain core backend services, with a focus on digital identity and wallet-related components.
• Implement and operate secure wallet functionality 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 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, Catena-X, W3C DID/VC standards and help shape their implementation.

Skills

Backend development

Java

C# .NET

Cloud-native

Docker/Kubernetes

CI/CD

cryptography basics

Tools

Docker

Kubernetes

CI/CD tooling

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

About Us

Cofinity-X GmbH is based in Cologne and was founded in 2023. It is a joint venture of BASF, BMW Group, Henkel, Mercedes-Benz, SAP, Schaeffler, Siemens, T-Systems, Volkswagen and ZF. The vision of Cofinity-X is to run an open marketplace for the provision of own and third-party business applications and further services that enable secured and standardized data transfer along the automotive value chain in accordance with the Gaia-X and Catena-X principles with initial focus on the European market.