Senior Software Engineer

Arqit; Belfast; On-site; GBP 50,000 - 70,000; Full time

Benefits offered by this job

25 days paid holiday

Private Medical Insurance

Pension

Bonus Scheme

Job summary

A leading cybersecurity firm located in Belfast is seeking a Senior Python Developer to enhance their Encryption Intelligence technology. The ideal candidate will have significant commercial experience and a deep understanding of Python programming. Responsibilities include developing robust software solutions and collaborating across teams. This full-time role offers comprehensive benefits including 25 days paid holiday, private medical insurance, and a bonus scheme.

Qualifications

• Significant commercial experience developing complex enterprise software and services.
• Extensive experience of Python programming and best practices.
• Experience with database development, both SQL and NoSQL.

Responsibilities

• Develop software for our Encryption Intelligence technology.
• Work closely with other engineers to implement full-stack software changes.
• Analyze deployment metrics to ensure high resiliency.

Skills

Python programming

Software development

Cloud service development

Problem-solving skills

Agile development

Tools

SQL

NoSQL

Rust

AngularJS

CI/CD tools

Job description

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 Engineering
Location: 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