Senior Technical Developer

Senior Developer / Technical Consultant (Contract or Part-Time) – Data and CRM Insight Data is a small, family business providing marketing data and proprietary CRM solutions for the construction and building products industry. Our award-winning platform, Salestracker, powers sales and marketing for hundreds of businesses across the UK, from large manufacturers to ambitious SMEs. We’re now in the final stages of developing Salestracker 4 - a completely rebuilt, next-generation SaaS platform that combines CRM, data intelligence, and marketing automation in one seamless ecosystem. Our internal software team has brought the project a long way, and it’s now in testing. But we’re looking for a seasoned senior developer or technical consultant to help us take it over the finish line - ensuring it’s robust, fast, reliable, secure, and a joy to use. This is a part-time or contract opportunity for someone with deep technical knowledge, strong leadership, and a passion for delivering first-class software. You’ll work directly with our internal dev team to refine, test, and optimise the platform, bringing best-practice insight, hands-on technical expertise, and real-world SaaS experience. Our Current Stack Salestracker 3 (current platform): • CodeIgniter 3 / PHP 8 • MySQL • SendGrid / Mosaico (STEM email module) • Apache • AWS S3 / DataSoap / Google Maps API • Linode (bare-metal deployment) Salestracker 4 (new platform): • NextJS 15 / NodeJS • PostgreSQL • Docker (containerised deployment) • AWS S3 / OpenMapTools / DataSoap • Linode (container pods) We’re Looking For • Proven experience delivering and scaling SaaS or CRM platforms • Strong understanding of NextJS / NodeJS / Docker / PostgreSQL • Experience with performance optimisation, testing, and deployment pipelines • Security-first mindset, with familiarity in data protection and API architecture • Ability to collaborate with an internal team, guide development priorities, and elevate code quality • Optional but valuable: experience with PHP-based legacy systems and migration planning What You’ll Do • Audit and refine our existing codebase and architecture • Support testing and performance tuning • Ensure system stability, scalability, and data integrity • Help us transition confidently from testing to live deployment • Provide hands-on support and mentoring for our in-house devs This is an exciting opportunity to join a respected, fast-growing tech company with real-world impact, working on a live SaaS platform used daily by some of the biggest names in our industry.