Senior Software Engineer

Arqit Belfast, Northern Ireland, United Kingdom

Senior Python Developer – Arqit

Overview

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 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 the talent from Ampliphae, combining their encryption intelligence products with Arqit’s quantum‑encryption technology and global reach to provide a comprehensive proposition that identifies and mitigates cyber risk exposure from both current and quantum threats.

Department: Software EngineeringLocation: Belfast

What you’ll be doing

Developing software for our Encryption Intelligence technology, working under the guidance of software architects and senior colleagues.

Transforming architectural models into component designs ready to be incrementally developed, tested and deployed.

Collaborating closely with software, automation and DevOps engineers to implement, review, test and deploy full‑stack software changes.

Working extensively with Python, with opportunities to train on Rust and AngularJS.

Analyzing the metrics of deployment changes, ensuring high resiliency and performance, resolving issues as 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 willing to offer constructive feedback and support to others.

Working closely with the Product Management team to help further refine requirements.

What we’re looking for

Significant commercial experience developing complex enterprise software and services.

Demonstrable experience building horizontally scalable, mission‑critical enterprise software and services, preferably in a startup environment.

Experience with 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 with triage, RCA and fix for software issues within a distributed system.

Competence in multiple programming languages.

Experience with database development (SQL and NoSQL).

Experience with design patterns, refactoring, OO design and related areas.

Strong analytical, problem‑solving and organizational skills.

Demonstrated accountability for results while 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 consuming cloud services from major providers (Azure, AWS, Google).

Both Linux and Windows development experience.

Rust, AngularJS, C++ knowledge.

CI/CD deployment experience (AzureDevOps, Helm, Flux).

Experience mentoring and training junior 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

Seniority level

Mid‑Senior level

Employment type

Full‑time

Job function

Engineering and Information Technology

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