Matrix are a significant customer of the Outsystems platform, in fact you’ll find our logo on the Outsystems website home page. We’ve been busy re-platforming our core external web facing products over the last few years and already have a number of Outsystems developers, but we’re looking to expand this team further due to the volume of activity underway. We have two core products, one platform that supports recruitment for several large UK employers, and another that delivers employee and volunteer screening services, including right to work in the UK, DBS checks and more. We use Outsystems 11 but are increasingly looking to use ODC in conjunction with our O11 estate, particularly to take advantage of its agentic capabilities.

Our benefits

We are currently working in a hybrid fashion with the ability to work remotely and in our office premises, however, due to the nature of your duties, you may be required to attend the Company's premises for meetings, as and when necessary.

• Standard Pension – 3% Employers, 5% Employee
• 25 days annual leave (plus Bank Holidays)
• Birthday day off
• 2 Volunteer days a year (to volunteer in the local community)
• Employee Health Benefits (Westfield Health)
• Online discounts platform for major retailers (Westfield Rewards)
• Electric Vehicle Salary Sacrifice Scheme (Octopus EV) and Cycle 2 Work Scheme
• Salary up to £65,000 per annum

About the role

We are seeking a highly capable Senior Developer to join our growing development team. This is an advanced intermediate position designed for developers who are ready to take ownership of medium to high complexity tasks with a focus on architecture, integrations, and scalable system design. As a Senior Developer, you will be a key contributor to the team’s technical direction, providing leadership in implementation, code quality, and system improvement initiatives.

You’ll collaborate closely with Technical Leads, Project Managers, and cross-functional teams, ensuring that delivered solutions are performant, secure, and aligned with business goals. Your work will often span multiple sprints and may involve complex migrations, data architecture evolution, and infrastructure-aware deployments.

Duties and Responsibilities

• Design, develop, and maintain robust applications using OutSystems, with a focus on:

o Advanced Client & Server Actions, Screens, and Aggregates

o Complex SQL queries and stored procedures within Microsoft SQL Server

o Secure, reusable, and performance-optimized components

• Independently deliver medium to high complexity features and epics with minimal oversight
• Build and manage system integrations using REST APIs, SFTP, and Integration Studio
• Participate in and lead peer code reviews, providing technical feedback and mentorship to junior and intermediate developers
• Contribute to architecture and infrastructure improvements, aligning with roadmap and enterprise standards
• Deploy solutions within company infrastructure, following proper DevOps and change management procedures
• Troubleshoot and resolve live production issues and lead root cause analysis for long-term solutions
• Collaborate with Project Managers and Tech Leadership

Essential Skills

• 3–5 years of professional experience in software development, with significant exposure to OutSystems and low-code platforms

Strong understanding of:

• System and application architecture design principles
• RESTful APIs, SFTP protocols, and other modern integration methods
• Microsoft SQL Server, with ability to write and optimize complex queries
• Infrastructure and deployment processes, including versioning, environments, and change control
• Proven experience developing and delivering secure, scalable, and performance-optimized components
• Familiarity with Agile methodologies, user story estimation, and iterative delivery practices
• Ability to lead code reviews, explain architectural decisions, and defend technical implementations
• Strong written and verbal communication skills, especially in collaboration with Tech Leads and Project Managers

Desirable Skills

• Experience with CI/CD pipelines and DevOps practices
• Knowledge of Microsoft Power Platform, SharePoint, or other Microsoft business tools
• Experience with data migration, refactoring legacy applications, and system modernization efforts
• Familiarity with monitoring/logging tools and system performance tuning
• Capacity for multi-sprint problem solving and forward-thinking system design

At Matrix, we celebrate what makes us unique. We are passionate about building and sustaining an inclusive and equitable working environment for all staff. If you require any reasonable adjustments to the recruitment process, do reach out to our HR team who will be happy to help - Matrixhrhelp@teammatrix.com

Pay: Up to £65,000.00 per year

Benefits:

• Bereavement leave
• Casual dress
• Company events
• Company pension
• Cycle to work scheme
• Employee discount
• Enhanced maternity leave
• Enhanced paternity leave
• Free parking
• Health & wellbeing programme
• Life insurance
• Private dental insurance
• Sabbatical
• Sick pay
• Work from home

Work Location: Hybrid remote in Milton Keynes MK5 8HJ