Senior Full Stack Software Developer (UK) in England

We’re looking for a Senior Software Developer to join our Team! We have an exciting opportunity for an experienced Senior Full Stack Software Developer to join our Development Team. At Keyzo, we take pride in planning, designing, and delivering high-quality technology solutions for our global clients. We offer unique product features and first-class service that set us apart in the marketplace. This role is suited to an established senior developer who has spent several years working on live, production systems in a commercial environment, and who is comfortable owning features end-to-end.

Working within our Development Team, the successful candidate will work both independently and collaboratively to support the development, enhancement and long-term stability of our core software solutions Induct & Train and Read & Sign. This is a hands-on senior role for a genuinely full-stack developer who can contribute high-quality code, support the wider team, and help drive technical excellence across our products.

What you’ll be doing

• Software Development

• Take ownership of designing, developing and maintaining full-stack features using PHP, JavaScript, NodeJS, React, HTML5, CSS3 and SQL
• Own the ongoing development, enhancement and stability of Induct & Train and Read & Sign
• Work as a senior contributor within the team, shaping solutions and influencing technical direction
• Participate in sprint planning and delivery within Agile methodologies using Jira
• Write clean, secure, maintainable and well-tested code suitable for long-term production use
• Improve performance, scalability and reliability across our systems
• Troubleshoot and resolve complex technical issues across the full stack
• Lead or contribute senior-level input into technical scoping and architectural discussions

• Provide technical guidance and mentoring to junior and mid-level developers
• Participate in and lead code reviews, promoting best practices and consistent coding standards
• Share technical insight to help shape solutions, documentation and specifications
• Work closely with QA, UI/UX and Product Owner to ensure high-quality, well-considered delivery

• Work closely with internal stakeholders to refine requirements and shape practical, scalable solutions
• Support the Commercial Team with technical input where required
• Occasionally support customer investigations through deep product and system understanding
• Contribute to a culture of continuous improvement, knowledge sharing and high engineering standards

Experience, Qualifications and Skills

Essential

• A degree in Computer Science, Software Engineering or a related discipline, or equivalent professional qualifications and sustained commercial experience clearly demonstrating software development as a long-term career
• Significant commercial experience working as a full-stack developer on live production systems
• Strong, hands-on experience across both frontend and backend development - this role is not suitable for candidates with a heavily skewed background toward only frontend or only backend
• Strong commercial experience working extensively with PHP and JavaScript-based systems, including React, NodeJS and SQL
• Solid understanding of software engineering principles, performance optimisation, security and testing
• Demonstrable experience owning and maintaining production features end-to-end
• Ability to estimate work accurately and deliver to agreed timescales
• Comfortable working autonomously while contributing effectively within a team
• Excellent communication skills with the ability to explain technical concepts clearly
• High attention to detail and a strong commitment to quality
• Self-motivated, proactive and committed to continuous learning
• Alignment with company values and a positive, team-first approach

Desirable

• Experience working within a SaaS or product-led software environment
• Experience with AWS or cloud-based deployments
• Familiarity with CI/CD pipelines, Git workflows and automated testing
• Understanding of usability, accessibility and modern UX principles
• Strong analytical and problem-solving skills when working with complex systems

Why work for us?

At Keyzo we aim high and plan to be a Global Technology Leader and an employer of choice. We are a Living Wage Employer and a proud supporter of the Armed Forces Covenant, achieving the Bronze and Silver Awards under the Employer Recognition Scheme. We also maintain a 4.8 rating on Glassdoor and consistently achieve an Engagement Multiplier score above 80. We believe that at the heart of every great company is a team of brilliant, driven professionals. As a values-led organisation, we work hard to ensure our employees feel supported and motivated to achieve their best.

Benefits

• Competitive salary £45,000 to £55,000 (dependent on experience)
• 25 days annual leave (increasing annually to year 5)
• £50 Amazon voucher on your birthday
• Loyalty Bonus Scheme (eligible after 12 months)
• Excellent pension scheme (5% employer contribution)
• Social events
• Personal learning budget
• Holiday purchase scheme
• Life assurance (4× salary)
• Flexible/hybrid working (typically one day in the office per week)
• Enhanced Occupational Sick Pay (after qualifying service)

Location

Headquartered in Kirmington (North Lincolnshire) with a modern office in Hull (East Yorkshire), we embrace hybrid working while valuing regular in-person collaboration. This role is suited to candidates already based within reasonable commuting distance of Hull or Kirmington (for example East Yorkshire, North Lincolnshire or North East Lincolnshire). You will be comfortable working remotely while also attending collaboration days, training sessions and meetings in person.

*Our vacancies are not open to recruitment agents. *Applicants must have the Right to Work in the UK and must not require visa sponsorship now or in the future.