Senior Software Engineer (C/C++)

United States Digital Space LLC; Stevenage; Hybrid; GBP 70,000 - 90,000; Full time

Benefits offered by this job

Contributory pension

Flexible holidays

Life assurance

Critical illness cover

Private healthcare

Performance bonus

Employee Share Incentive Plan

Job summary

Calnex is seeking a Senior Software Engineer (C/C++) to join our NE-ONE network emulation product family.

You will design, implement, and maintain high‑performance backend solutions with end-to-end ownership, collaborating with product owners to refine requirements and evolve system software for ongoing scalability.

Qualifications

• Degree in Computer Science, Software Engineering, or equivalent.
• 5+ years of software development experience.
• 2+ years developing in a Linux environment using GCC/gdb.
• 2+ years mentoring and supporting other software engineers.
• Strong C++ programming experience and OO design.
• Network programming experience and multithreading experience.
• Python programming experience.
• Ability to decompose complex problems and estimate timescales.
• Proven ability to plan and meet deadlines in a dynamic environment.
• Excellent written and verbal communication skills.

Responsibilities

• Design, implement, and maintain complex back-end solutions with end-to-end ownership.
• Work with product owners to refine high-level requirements.
• Contribute to architecture and evolution of system software for performance and scalability.
• Estimate timescales and deliver quality software accordingly.
• Support quality activities to deliver customer-delighting products.

Skills

C++ programming

Object-oriented design

Multithreaded programming

Linux development

Network programming

Python programming

Analytical thinking

Team mentoring

Education

Degree in Computer Science or Software Engineering or equivalent

Tools

Docker

GitHub Actions

Jenkins

Terraform

AWS

Kubernetes

Job description

the company is an innovative and successful company that develops software enabled, leading edge test & measurement products that test networks and network dependent applications to prove performance and usability.

Our developers work in multi-discipline and dynamic product development teams that work closely with marketing and sales, turning market and customer requirements into innovative, impactful products.

Our R&D team is growing to support our expanding product portfolio. As part of this growth, we have an exciting opportunity for a C/C++ Senior Software Engineer to work on our NE-ONE network emulation product family. This is an ideal opportunity for someone wishing to utilize their experience in highly performant software development. The successful candidate will enjoy working with a small team on the leading edge and be able to innovate and deliver in a fast paced and busy environment.

Key Responsibilities

• Designing, implementing, and maintaining complex back end solutions to deliver new products and features with full end to end ownership.
• Working closely with product owners to understand and refine high level system requirements into deliverables.
• Contributing to the architecture, implementation and evolution of system software to keep it performant, scalable, flexible and maintainable as requirements evolve
• Estimating timescales based on an outline of the implementation and then developing and delivering quality software to those timescales
• Supporting quality-oriented activities necessary to deliver a product that will delight our customers

Essential Skills

• Educated to Degree level in Computer Science, Software Engineering, or equivalent
• At least 5 years experience in software development
• At least 2 years experience developing in a Linux environment, using the GNU suite (gcc, gdb)
• At least 2 years experience mentoring and supporting other software development engineers
• Strong C++ programming experience and Object-oriented techniques
• Strong logical and analytical skills
• Network programming experience
• Multithreaded programming experience
• Python programming experience
• Ability to innovate and think outside the box
• Able to decompose complex problems into smaller, more manageable units and estimate the timescales involved
• Demonstrated ability to plan and meet tight deadlines in a dynamic environment
• Excellent written and verbal communication skills

Desirable Skills

• Practical experience designing automated CI/CD pipelines utilizing Jenkins and GitHub Actions
• DPDK programming experience
• High-performance / real-time systems programming experience
• JavaScript experience
• Proficiency in Docker and container orchestration workflows
• Familiar with Terraform and AWS cloud services

Calnex is an inclusive, supportive, and growing company with a strong focus on employee engagement and wellbeing. We strive to provide a working environment that develops and challenges our employees.

We reward success and offer competitive salaries. Our comprehensive benefits package includes a contributory pension plan, flexible holidays, life assurance, critical illness cover, private healthcare, performance bonus and an opportunity to join the Calnex Employee Share Incentive Plan.

The Calnex team are currently working in a hybrid model at their managers discretion. This flexibility is dependent on job role and supports a positive work/life balance and the needs of the business. This role requires a minimum of 2 working days in the office (Tuesday and Thursday), with the other three days at home when possible. This may vary depending on whats required to fulfil the requirements of the role.

Please take a look at our website to find out more about what we do and what its like to be an employee at Calnex!

Calnex are licensed to sponsor under the Skilled Worker Immigration route (A-rating).

*In consideration of the General Data Protection Regulation (GDPR), please be aware that by applying for a role in the company directly or via an intermediary you are giving permission for us to retain certain personal information for a period of up to two years. That information includes your CV, cover letter or any other correspondence relating to your application and any notes we may take at interview.*