Senior Software Developer

Cognibox; Cardiff; Hybrid; GBP 45,000 - 65,000; Full time

Job summary

A leading software company in Cardiff is seeking a Senior Software Developer to work in a collaborative Agile environment. The role involves developing innovative solutions to create safer workplaces globally, as well as improving existing processes. Candidates should have proficiency in microservices and RESTful API development, experience with relational databases like SQL, and expertise in AWS tools. A hybrid workplace policy allows for 3 days in the office, alongside various benefits including enhanced parental leave, healthcare, and a pension scheme.

Benefits

Enhanced Parental Leave

Generous annual leave

Healthcare Plan

Annual Giving Day

Cycle-to-work Scheme

Pension scheme with employer contributions

Life Assurance

Rewards Program

LinkedIn Learning License

Qualifications

• Proficiency in microservices architecture and RESTful API development.
• Good experience of working with relational databases, i.e. SQL and MySQL (including database triggers).
• Hands-on expertise of AWS (ECS, Lambda, API Gateway, ECR, S3).
• Understanding of CI/CD mechanisms such as GitHub Actions.

Responsibilities

• Support development of tools, services and platforms.
• Collaborate with other teams to identify improvements and develop new services.
• Plan, write, test and maintain code for web, mobile and desktop applications in an Agile environment.
• Assist in production releases and updates.

Skills

Microservices architecture proficiency

RESTful API development

Relational databases (SQL, MySQL)

AWS (ECS, Lambda, API Gateway, ECR, S3)

Version control (GitHub)

Agile/Scrum teamwork

Problem-solving skills

Understanding of CI/CD mechanisms

Agile tooling (Jira, Confluence)

Security best practices awareness

Education

Degree in a relevant discipline

Tools

Docker

Microsoft Office Applications

Job description

Senior Software Developer

Application Deadline: 5 January 2026

Department: Technology & Product

Employment Type: Permanent

Location: Cardiff, UK

Reporting To: Manager, Software Development

Description

Building innovative solutions; enabling safer workplaces for everyone.

We’ll create a safer working world, building software to support a global network of responsible buyers, suppliers and partners. At Alcumus we take the pain out of compliance for over 50,000 organisations globally, helping them protect their people, their operations, and the planet. The tech we build today, will create a better tomorrow.

The Senior Developer role will work collaboratively within a multi-functional team of Developers, DevOps Engineers, QA Analysts and Product Owners to enhance and create software application to a high standard. Working within a Scrum squad you will have support and mentorship to flourish while joining and contributing to all the sprint events and help facilitate the team successfully completing the sprint objectives.

What that means day to day

• Be an integral part of the development team, actively supporting development of tools, services and platforms.
• Review and contribute to the ongoing improvement of team practices and Ways of Working with an aim to making the team more effective and improving delivery.
• Collaborate with other teams – both within the Technology department and across the business - to identify improvements to existing processes and services or where new services could be developed.
• Work closely with key stakeholders in the collection and documentation of user requirements and the development of user stories.
• Plan, write, test and maintain code for web, mobile and desktop business applications in accordance with established standards in an Agile environment.
• Troubleshoot and assist with investigation of production escalations and issues.
• Assist and recommend on architectural and technical decisions.
• Participate in peer-reviews of solution designs and related code.
• Assist and participate in production releases and updates that will further enhance our applications.
• Work closely with the quality teams to ensure that standards are maintained.
• Provide third-level support to business users.
• Adapt and learn to work with other languages/platforms where required.
• Keeping up to date with the latest relevant technological innovations.

What you’ll need to be successful

• Proficiency in microservices architecture and RESTful API development.
• A desire to become a lead developer.
• Awareness of AI Tools such as GitHub Copilot.
• Good experience of working with relational databases, i.e. SQL and MySQL (including database triggers).
• Good understanding of modern software architectures (e.g., microservices, event-driven, CQRS).
• Hands‑on expertise of AWS (ECS, Lambda, API Gateway, ECR, S3), Docker · Understand and can write unit tests (TDD, JUnit, Mockito).
• Experience of version control such as GitHub.
• Competent with Microsoft Office Applications (Word, Excel, PowerPoint and Outlook).
• Strong problem‑solving skills, attention to detail, and eagerness to learn · Ability to work effectively within an Agile/Scrum team.
• Good organisational and communication skills.
• Understanding of CI/CD mechanisms such as GitHub Actions.
• Familiarity with Agile tooling (Jira, Confluence).
• Awareness of security best practices (OWASP, ISO 27001, ISO 27032).
• Degree educated in a relevant discipline.

What you'll get in return

Alcumus has a hybrid workplace policy, where you will work from the office 3 days per week. We want you to be able to do your best work here. We emphasize providing many ways to support our team to do their best work and below are some of the perks and benefits we offer.

Personal Health & Wellbeing / Benefits

• 🍼 Enhanced Parental Leave
• 🌴Generous annual leave
• 🏥 Healthcare Plan
• 💟 Annual Giving Day – an extra day to give back to yourself or your community
• 🚲 Cycle-to-work Scheme

Future Planning

• 💰 Pension scheme with employer contributions
• 🧬 Life Assurance – 3X base salary
• 💸 Rewards Program – access to discounts and cashback
• 🏫 LinkedIn Learning License for upskilling & development

Interested but don’t feel you meet all the requirements? Our recruitment team assesses and reviews all applications against the role and business needs. We believe in people having transferable and soft skills and want you to know that we do consider where an individual might not meet all the criteria, but have the aptitude and capability, nonetheless. Our priority is to ensure we set people up for success. We will make a final call based on our determining whether we can offer the necessary support to upskill or provide the developmental support needed for you to get the best out of this opportunity with us!

Bring Your Whole Self to Work.

Alcumus is proudly an equal‑opportunity employer. We are committed to ensuring that no candidate is discriminated against because of gender identity and expression, race, disability, ethnicity, sexual orientation, age, colour, region, creed, national origin, or sex. We are dedicated to growing a diverse team while continuing to create an inclusive environment where everyone feels safe and empowered to be themselves.

What you can expect if you apply:

• A response to your application within 15 working days
• An interview process consisting of:
  • An initial discovery call with the recruiter
  • A first stage interview via Microsoft Teams
  • Additional interview (likely face to face) with the stakeholders you’ll be working with closely in the role

We’re keen to ensure our hiring process allows you to be at your best, so if you need us to make any adjustments, please just let us know.