Web & Mobile Developer

This is an excellent opportunity for a capable web developer who enjoys solving real business problems and owning work end-to-end in a modern, forward-thinking financial services business.

We develop and operate proprietary back-office and client-facing applications, with our CRM at the centre of the business. You will work across mobile and web development, CRM configuration, reporting, automation and application support.

You will be involved throughout delivery, from understanding requirements and designing solutions through to development, testing, deployment, documentation and support. You will work closely with users and use our established AI-assisted development framework to deliver practical improvements across the business.

Development

• Develop client-facing web applications using React, TypeScript and .NET Web APIs.
• Develop mobile applications using React Native and TypeScript.
• Configure and extend our proprietary CRM using T-SQL, C#, WebForms and BPM/workflow tools.
• Build services, APIs, automations and integrations across our systems.
• Help modernise legacy functionality into clean services and modern user interfaces.
• Develop reusable, maintainable components with appropriate security, logging and error handling.
• Contribute to CI/CD pipelines and automated testing.
• Conduct thorough testing and participate in peer reviews.
• Support development across mobile and web technologies as business requirements evolve.

Azure and AI

• Develop and support applications using Microsoft Azure.
• Work with App Service, Functions, Azure SQL, Storage, Key Vault, App Configuration and Application Insights.
• Apply secure authentication, managed identity and configuration practices.
• Contribute to AI-enabled applications and internal automation.
• Use AI-assisted development tools while testing and critically reviewing generated output.
• Help improve prompts, evaluations, workflows and supporting technical controls.

Data, Reporting and Automation

• Build and maintain management information reports and dashboards.
• Use SQL to investigate business questions, reconcile results and resolve data-quality issues.
• Write clear and performance-conscious T-SQL queries.
• Work with users to identify manual processes, recurring issues and opportunities for improvement.
• Implement improvements through reporting, CRM configuration, automation and software development.
• Contribute to wider data and reporting solutions as required.

Application Support

• Triage and resolve issues affecting the CRM, reporting and other in-house applications.
• Investigate problems using SQL, Application Insights and application logs.
• Own issues through diagnosis, resolution, testing and communication.
• Turn recurring incidents into preventative fixes, automation or documentation.
• Support users with system changes and adoption.

This is business-application support rather than a general IT helpdesk role.

Requirements and Documentation

• Work directly with stakeholders to establish clear problems, requirements and expected outcomes.
• Translate requirements into maintainable technical solutions.
• Raise risks and dependencies early and communicate progress clearly.
• Produce proportionate technical designs, release notes, data-flow diagrams and runbooks.
• Contribute to data governance, secure development and technical-control documentation.

Accountability and Working Relationships

• Part of a small, highly motivated development team.
• Works closely with the hands-on CTO and existing developers.
• Collaborates directly with operations, advice, compliance and administration.
• Accountable for delivering reliable solutions through to production and support.
• Contributes to both planned development and business-as-usual improvements.

Working Environment and Hours

• Office-based in Doncaster, with occasional remote working where appropriate.
• Monday to Friday, 09:00-17:30.
• Reasonable flexibility around working hours, aligned with delivery requirements.
• Full-time, permanent position.

• Commercial web-development experience.
• Strong React and TypeScript fundamentals, including reusable components and state management.
• Practical mobile application development experience, ideally using React Native.
• Working knowledge of C#/.NET and Web APIs, or strong transferable back-end experience.
• Good Microsoft SQL Server/T-SQL and relational-data skills.
• Experience integrating applications with REST APIs.
• Understanding of authentication and application-security fundamentals.
• Hands-on experience with Microsoft Azure.
• Experience with Git, testing, debugging and controlled releases.
• Strong analytical and stakeholder-communication skills.
• Willingness to work across mobile and web development, CRM, data, automation and application support.
• Effective and responsible use of AI-assisted development tools.

Skills - Desirable

• Experience releasing mobile applications through the Apple App Store and Google Play.
• Microsoft Foundry/Azure AI Foundry, Azure OpenAI or other AI-orchestration experience.
• Power BI, Power Query or data modelling.
• Data warehousing, ETL, Microsoft Fabric or Azure Data Factory.
• .NET Framework 4.x and WebForms.
• CRM configuration, BPM workflows, forms, validation rules or templates.
• Entra ID and OAuth2/OIDC.
• Mobile CI/CD, push notifications, deep linking and crash monitoring.
• Azure networking, private endpoints and secure cloud configuration.
• Financial-services experience, particularly retirement or custodial platforms.
• Knowledge and experience working with the Seccl API.
• ISO 27001, ISO 9001 or data-governance exposure.

Development Path

Candidates may be stronger in some areas than others. You may come from a React-based mobile and web development background and want to broaden into .NET, Azure, data and business systems, or from a wider web-development background with practical mobile application experience.

Candidates lighter in one area will be considered where they demonstrate strong fundamentals, relevant delivery experience and the ability to learn quickly. Over time, the role will develop into broader ownership across our applications, data, automation and AI capabilities.

Pulled from the full job description

• Annual leave
• Free parking
• Company pension
• Company events
• Flexible schedule
• On-site parking, * Salary of £35,000-£40,000 dependent on experience.
• 24 days’ annual leave plus bank holidays.
• Pension scheme.
• Flexible working hours where practical.
• Opportunity to own meaningful projects end-to-end.
• Experience across mobile and web development, Azure, data and AI.
• Clear progression into broader development responsibilities.