Senior Software Engineer

Arqit Quantum Inc.; Belfast; Hybrid; GBP 60,000 - 80,000; Full time

Job summary

A leading cybersecurity company is seeking a Senior Software Engineer in Belfast. You will develop software for advanced encryption technology and collaborate with DevOps engineers in an innovative environment. The ideal candidate has significant experience with enterprise software and Python programming. This role offers hybrid/remote work options and includes various employee benefits such as paid holidays, medical insurance, and a bonus scheme.

Benefits

25 days paid holiday

Private Medical Insurance

Bonus Scheme

Qualifications

• Significant experience in developing complex enterprise software.
• Extensive Python programming and best practices.
• Experience in building scalable software systems.

Responsibilities

• Develop software for Encryption Intelligence technology.
• Collaborate with a team of software and DevOps engineers.
• Participate in Agile development activities.

Skills

Developing complex enterprise software

Extensive experience in Python programming

Problem-solving skills

Cloud service development

Building horizontally-scalable systems

Tools

Python

Rust

SQL

NoSQL

Job description

Senior Software Engineer

Department: 480 - Software Engineering

Employment Type: Permanent

Location: Belfast

Description

Arqit is a global cybersecurity company delivering quantum-safe encryption to secure data and communications for enterprises, governments, and critical national infrastructure (CNI). Powered by its advanced symmetric key cryptography, Arqit offers scalable encryption that is resilient to quantum threats, ensuring robust data protection across sectors such as telecoms, defence, and finance.

Arqit has recently welcomed aboard the talented team from Ampliphae. This brings together Ampliphae’s industry-leading Encryption Intelligence products with Arqit’s quantum-encryption technology and global reach, delivering a comprehensive proposition to identify and mitigate cyber‑risk exposure from both current and quantum threats.

Our combined company now has a new opportunity for a self‑motivated and enthusiastic Senior Python Developer to join our friendly team based in Belfast. We can offer you fun and interesting work in both cloud and on‑prem cybersecurity, and we have a great culture that gives you the opportunity to innovate, take ownership, and scale new heights in your career.

On offer is a hybrid/remote way of working and the challenge of being involved in an innovative and complex environment where no two days are the same.

What you’ll be doing

• Developing software for our Encryption Intelligence technology, working under the guidance of our software architects and other senior colleagues.
• Transforming architectural models into component designs ready to be incrementally developed, tested and deployed.
• Collaborating closely with our team of software, automation and DevOps engineers to implement, review, test and deploy full‑stack software changes.
• Working extensively with Python; you will have the opportunity to train on Rust and AngularJS.
• Analysing the metrics of your deployment changes, ensuring high resiliency and performance is maintained and resolving issues if they arise.
• Fixing issues found internally and by our customers.
• Actively participating in Agile development activities and rituals, supporting the growth of the team and its members.
• Being open to receiving feedback and offering constructive feedback and support to others.
• Working closely with the Product Management team to help further refine requirements.

What we’re looking for

You’re an intelligent innovator who thinks outside of the box with a record of delivering great results against the most complex of problems. You take ownership without being asked, work with autonomy, and are a team player with a relentless desire to help your team succeed. You are open, honest and respectful, appreciate the value of diversity, and enjoy the challenge of working in an ambiguous environment where no two days are the same. You recognise the need to work at pace but are also laser‑focussed to ensure that what’s delivered delights the end‑user.

We would like you to have most of the following skills:

• Significant commercial experience of developing complex enterprise software and services.
• Demonstrable experience in building horizontally‑scalable, mission‑critical enterprise software and services, preferably in a startup environment.
• Experience of cloud service development (public/hybrid/private cloud PaaS or SaaS).
• Extensive experience of Python programming and best practice.
• Demonstrable passion for software development through self‑learning, personal projects, competitions, etc.
• Experience of triage, RCA and fix for software issues within a distributed system.
• Competence in multiple programming languages.
• Experience of database development (SQL and NoSQL).
• Experience with design patterns, refactoring, OO design and related areas.
• Strong analytical, problem‑solving and organisational skills.
• Demonstrate accountability for results whilst working with high autonomy.
• The right to live and work in the UK without restriction.

Desirable (but not essential!)

• Experience working in cyber security.
• Experience in a start‑up/scale‑up.
• Agile or Kanban experience.
• Experience of consuming cloud services from the big‑three providers (Azure, AWS, Google).
• Both Linux and Windows development experience.
• Rust, AngularJS, C++.
• CI/CD deployment experience (Azure DevOps, Helm, Flux).
• Experience of mentoring and training junior members of staff.

Benefits

• 25 days paid holiday
• 8 bank holidays
• Pension
• Private Medical Insurance
• Life Insurance
• Income Protection
• Employee Assistance Programme
• Coaching
• Parental Leave
• Personal Travel Insurance
• Subsidised Season Ticket Loan
• RSU Equity Package
• Bonus Scheme
• Ride to Work Scheme
• Benefit Hub