Back End Developer

Shape the Future of Payment Security

Are you passionate about cryptography, security engineering, and building systems that protect millions of transactions every day?

We're looking for an Intermediate Cryptography Engineer to join our growing team and help design, implement, and support secure cryptographic solutions for payment and financial services environments. This is a unique opportunity to work at the intersection of applied cryptography, payment security, HSM integration, and backend engineering, tackling complex security challenges in production environments.

If you enjoy solving difficult technical problems, working with industry standards, and turning cryptographic theory into real-world solutions, we'd love to hear from you.

What You'll Do

As a Cryptography Engineer, you will:

• Design and develop cryptographic services and secure backend solutions
• Integrate applications with enterprise HSMs and cryptographic infrastructure
• Implement key management and key lifecycle processes
• Work with payment cryptography technologies including:
  • PIN Blocks
  • DUKPT
  • CVV/CVC
  • PVV
  • EMV
• Implement and troubleshoot industry standards such as:
  • TR-31
  • TR-34
• Investigate security and cryptographic incidents
• Conduct security-focused code reviews and testing
• Collaborate with clients and technical partners on integration projects
• Participate in architecture, security, and technical design discussions
• Research emerging cryptographic technologies and security innovations
• Create and maintain technical documentation and implementation guides

What You Bring

Cryptography & Security

You have a strong understanding of:

• Symmetric and asymmetric cryptography
• AES, RSA, ECC
• Hashing, HMAC and key derivation
• Cryptographic key management and lifecycle processes
• PKI, TLS and authentication frameworks
• Common implementation vulnerabilities and mitigation strategies

Payment Security

Experience or knowledge of:

• Payment HSMs
• TR-31 and TR-34
• PIN block formats
• DUKPT
• CVV/CVC and PVV generation
• EMV cryptography

Experience with Thales payShield HSMs is highly advantageous.

Software Engineering

Strong proficiency in one or more of:

• Java
• Go
• C/C++
• Python

Along with experience in:

• REST API design and integration
• Git-based development workflows
• Automated testing
• Distributed systems
• Observability, logging, metrics and tracing

Bonus Points For

While not required, we’d love to see experience with:

• Docker and containerisation
• Infrastructure as Code
• Cloud platforms and cloud security
• Secrets management
• Monitoring and observability tooling

Industry & Standards Knowledge

Exposure to the following standards is highly valued:

• PCI PIN / PCI PTS
• PCI DSS
• ISO 9564
• ISO 8583
• ISO 20022
• ANSI X9
• EMV Standards
• PKCS Standards

Research & Emerging Technologies

We encourage innovation and continuous learning. Interest or experience in any of the following is a significant advantage:

• Trusted Execution Environments (TEEs)
• Passkeys & WebAuthn
• Fully Homomorphic Encryption (FHE)
• Confidential Computing

We value curiosity and the ability to independently learn complex concepts just as much as prior exposure.

Bachelor's degree in Computer Science, Computer Engineering, Electrical Engineering, Mathematics, Cybersecurity, or a related field

2+ years of professional experience in software engineering, cryptography, or security-related roles

Experience building and supporting production systems

Strong foundations in computer science, cryptography, and security engineering

Ability to independently solve complex technical challenges

Ideal Candidate

You're an applied cryptographer who enjoys building real-world systems.

You can take a cryptographic requirement, understand the underlying security model, identify the required keys and cryptographic operations, integrate with an HSM, develop supporting backend services, thoroughly test the solution, and troubleshoot issues in production.

Core Skill Profile

Cryptography + HSMs + Payment Security + Backend Engineering + Security Engineering

Additional expertise in Kubernetes, DevOps, and cloud infrastructure is advantageous but not essential.

Why Join Us?

• Work on mission-critical payment and security systems
• Solve highly complex technical challenges
• Collaborate with experts in cryptography and fintech
• Exposure to cutting-edge security technologies
• Opportunities for professional growth and research
• Make a meaningful impact in a fast-growing, security-focused environment

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