Senior Software Developer

Onyx-Conseil; Cardiff; Hybrid; GBP 51,000 - 65,000; Full time

Job summary

An innovative company is seeking a Senior Developer to join their dynamic Agile Software Development teams. This role involves designing efficient solutions, mentoring fellow engineers, and ensuring high-quality code through rigorous standards. You'll work in a flexible environment that values work-life balance and continuous improvement, contributing to impactful projects that serve millions globally. With a strong focus on employee wellbeing and professional growth, this position offers a unique opportunity to shape the future of digital services while being part of a supportive and inclusive team.

Benefits

30 days annual leave

Civil Service Pension Scheme

Flexible working hours

Employee wellbeing programs

Cycle to work scheme

Generous parental leave

Paid volunteering leave

Recognition schemes

Online financial support

Seasonal flu jabs

Qualifications

• Extensive software engineering experience with strong technical skills.
• Ability to mentor and support others through pair programming.
• Passion for high-quality, well-crafted code and associated tooling.

Responsibilities

• Design efficient and maintainable solutions for software development.
• Mentor software engineers and maximize automated test coverage.
• Ensure code quality through thorough code reviews.

Skills

Java

JavaScript

Node.js

Agile Methodologies

RESTful APIs

Test-Driven Development

Behavior-Driven Development

Communication Skills

Education

STEM Degree

Tools

Version Control

Relational Databases

NoSQL Databases

Golang

TypeScript

Kafka

Elasticsearch

Job description

• Do you have a passion for delivering user focused digital services and using the latest technology to deliver solutions to a global audience of millions?
• Are you enthusiastic about clean code, well designed software and mentoring others to enable them to work at their best?

If the answer to the above is yes, we would love you to join us and be part of our team to help us build the future of our Digital Services!

The majority of our teams are primarily based in our Cardiff head office. The teams are a mix of hybrid and fully remote workers. We are offering this role on a hybrid/remote basis, aligned to the Cardiff office.

Companies House offers a flexible and welcoming culture that promotes a healthy work life balance as well as a proactive approach to wellbeing that allows us to be our best at work. We recognise that people are the key to our success so offer a fantastic benefits package including flexible working with no core hours, 30 days annual leave, 8 bank holidays and 1 privilege day as well as enrolment into the Civil Service Pension scheme with a contribution rate averaging 28%.

Job description

As a Senior Developer you'll join one of our many Agile Software Development teams. A typical team is made up of an agile delivery manager, developers, testers, user researchers, analysts and a product owner.

You'll be responsible for:

• Designing efficient and maintainable solutions
• Contributing and adhering to our technical standards
• Mentoring software engineers in your team and the wider software development community
• Maximising the automated test coverage to help move to continuous delivery
• Ensuring code quality through code reviews

Person specification

We are looking for the following experience and skills which will be assessed at sift and interview.

Experience

• Youll have extensive software engineering experience, with excellent technical skills and the ability to complete detailed design. A degree in computing or similar would be an advantage
• You are patient and have proven experience to help support and mentor others with different degrees of expertise to maximise their potential - including through techniques such as pair programming
• Youll have a passion for high quality, well-crafted code, and associated tooling
• You embrace continuous integration and have a continuous delivery mindset
• You have excellent communication skills and can help explain complicated technical issues to individuals who dont share the same technical experience
• Recent experience as a Java or JavaScript/Node developer in an agile software engineering environment
• Experience of developing software throughout the delivery lifecycle
• You ideally have experience designing and building RESTful APIs and supporting them in a live production environment

Technical experience

• Have a STEM degree with a programming element or equivalent commercial software development experience (well ask for evidence of this)
• Strong knowledge of programming tools, frameworks, and techniques in at least one of the following ecosystems: Java and/or Node (you will be expected to learn the other once in post as required according to business needs)
• Application of good working practices such as test-driven and behaviour-driven development (TDD/BDD), pair programming, version control/branching strategies, and application of design patterns
• Knowledge of all key full stack web technologies, including use of relational and noSQL databases
• Knowledge of any of the following technologies/approaches are beneficial: Golang, TypeScript, Kafka, Deployment pipeline tooling (e.g. Concourse), Infrastructure as Code, Elasticsearch, MongoDB, cloud-first micro-service driven architecture
• Knowledge of WCAG 2.1 accessibility guidelines is desirable

What it is like to work in Companies House

Inclusive and diverse teams are important to us. Wherever possible we offer flexible working arrangements. We'll support you to meet other commitments and help you strike a better work-life balance. We're keen to create an environment that works for everyone, and we particularly encourage applications from different underrepresented demographics.

Half a day a week is devoted to Innovation time where everyone in digital can work on whatever they choose, be that building new applications, trying new technologies or working towards certifications, it's up to you. In addition to this we offer lots of opportunities to have training as and when it is needed. We trust and empower our staff to work in a way which best suits them.

Companies House is an award-winning employer, with an Investors in People Platinum Award we are at the forefront in ensuring our staff reach their full potential in building brilliant services on cutting-edge technology. You'll be joining our Software Engineering Profession at a time of transformation and you will be a part of shaping the future of our department. We use Agile Methodologies and promote a culture of continuous improvement.

Qualifications

Have a STEM degree with a programming element or equivalent commercial software development experience (evidence is required)

Benefits

Alongside your salary of £51,854, Companies House contributes £15,022 towards you being a member of the Civil Service Defined Benefit Pension scheme.

We offer an excellent benefits package that includes:

• a generous 30 days annual leave plus 8 bank holidays and 1 privilege day
• enrolment into the Civil Service Pension Scheme with a contribution rate of averaging 28%
• a range of recognition schemes including instant awards to thank and recognise each others efforts and contributions
• strong ethos of equality, diversity and inclusion
• great work life balance with flexible and mobile working available for many roles
• a pro-active approach to employee wellbeing that allows our employees to flourish and be their best at work and has enabled us to become an Investors In People platinum accredited employer
• online financial support and advice
• seasonal flu jabs
• generous maternity, paternity, adoption and shared parental leave allowances
• a focus on career development and progression
• a number of inclusive network groups to support our colleagues and a great sports and social society
• cycle to work scheme
• staff discount scheme
• holiday play scheme for children
• 3 days paid volunteering leave

Next Steps

Click'Apply Now'to be taken to our main advert Civil Service Jobs where you can see more details regarding the role, the incredible benefits we have to offer and what it's like to work in Companies House.

If you have any questions about the role or process, please reach out to .

This role closes on 26 May 2025.