Staff Software Engineer, Backend (m/f/d)

Affinidi; London; On-site; GBP 125,000 - 150,000; Full time

Job summary

A technology company in London is seeking a Staff Software Engineer focused on backend development. The successful candidate will design and build high-quality systems, work with global teams, and improve product performance. Candidates should have strong cloud computing skills, experience in REST APIs, and a solid understanding of cryptography. Offers competitive compensation and unlimited vacation policy.

Benefits

Unlimited vacation policy

Competitive compensation package

Learning budget

Work within an international environment

Qualifications

• Proven experience diagnosing and preventing performance issues.
• Deep expertise in cloud computing, preferably AWS.
• Understanding of design patterns with microservices deployment.

Responsibilities

• Build secure features with TypeScript & React.
• Partner with cross-functional teams to drive quality.
• Lead and mentor peers in code reviews.

Skills

Performance issue diagnosis

Expertise in AWS

Technical documentation

Hands-on experience with REST APIs

Cryptography knowledge

Experience with authorization/authentication

Building systems with cryptographic requirements

Knowledge of microservices

Collaboration in global teams

Job description

Staff Software Engineer, Backend (m/f/d)

London, England, United Kingdom

About the Company

Affinidiis a technology company dedicated to changing data ownership for good. We empower businesses and individuals with control and ownership of their data, with a comprehensive approach to managing their holistic identity – accounting for all aspects of their digital footprint while ensuring privacy and security.

Affinidi’s technology enables users to benefit from decentralised digital identity solutions. We believe that everyone has the right to own and control their data, and we are committed to creating a trusted digital credentials ecosystem that empowers businesses and individuals to securely exchange data and services across borders and industries.

About the role:

We are in search of a solution-oriented and experienced Staff Software Engineer (Backend)to join our Affinidi Elements team. In this role, you will work with global peers on teams dedicated to areas of the product portfolio, from the product, design, infrastructure, architecture, and back/front-end engineering teams. You will be responsible for the continued enhancement and development of a multi-component platform, where your expert skills in designing, architecting, and building quality systems will intersect with your hands-on coding, performance testing, and integrating experience.

Our work culture at Affinidi is shaped by the following tenets:

• We are unapologetically customer-focused
• We invest in cultures and teams to enable high performance
• Embraces experimentation and builds fast
• We have the courage to be misunderstood
• We work together to unlock data

What’s in it for you:

• Build secure, high-quality features and improvements for Affinidi Elements using TypeScript & React
• Turn complex data into actionable product decisions
• Partner with product, security, and architecture teams to drive quality in a fast-paced, iterative environment
• Champion improvements in product quality, security, and performance
• Tackle large, challenging technical problems with confident ownership
• Write and review code that sets the bar for style, maintainability, and scalability
• Lead and collaborate on major features and projects—minimal hand-holding required
• Mentor peers; drive process and tooling improvements across the team

You will be a great match if you:

• Have proven experience diagnosing and preventing performance issues
• Have deep expertise in cloud computing (AWS preferred) and native environments
• Understand design patterns and have a track record of deploying microservices in the cloud
• Are skilled in technical documentation (C4 Model, ADRs)
• Are hands‑on withREST APIsand applyTest‑Driven Development (TDD)
• Have a solid understanding ofcryptography
• Bring experience inauthorization/authenticationdomains
• Thrive in autonomous, fast‑moving startup environments and global teams
• Experience working across functions, locations, and time zones
• Expertise indecentralized identity solutions
• Experience building systems with advanced cryptography requirements

What can you expect from us:

• Unlimited vacation policy
• Competitive compensation package
• Work within international environment
• Learning Budget

Sounds like you? Apply now!

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We believe in hiring different and diverse talent and providing a safe space where everyone can share their views without fear, where differences are celebrated, and where no one is left out. Inclusive cultures are the foundation for collaboration and innovation within our team.

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