Senior Full Stack Developer

The Opportunity This is not your typical developer role.
As a Senior Full Stack Developer, you'll lead the design and delivery of scalable, secure, and high-performing applications that integrate deeply with their core systems.
You'll work across front-end, back-end, data, APIs, and cloud environments, while also steering high-profile projects unique to the business - from CRM transformation and AI integration to solar data platforms and client onboarding systems.
This role is perfect for an experienced developer who thrives on full stack engineering challenges and wants to apply their skills to projects that have a tangible impact in the energy and sustainability sector.
What You'll Do Full Stack Engineering (Core) Design, build, and maintain scalable full stack applications across front-end and back-end.
Develop modern, responsive interfaces (React, Angular, or Vue) and robust server-side solutions (Node.js, .NET, or Java).
Architect APIs (REST/GraphQL) to connect systems and deliver custom reporting solutions.
Manage databases (SQL Server, PostgreSQL or equivalent), ensuring integrity, performance, and scalability.
Apply best practices in code quality, testing, and DevOps, with security-first thinking.
Security & Risk Management Design and maintain secure applications with best practices in secure coding, data protection, and threat mitigation.
Implement real-time monitoring, logging, and response mechanisms to detect vulnerabilities and cyber threats.
Develop and maintain authentication and authorisation frameworks, including RBAC, MFA, and secure API integrations.
Identify, assess, and manage security risks across application architectures, ensuring compliance with ISO 27001 and the Information Security Management System.
Embed security throughout the software development lifecycle (SDLC), conduct regular security assessments, and ensure regulatory compliance (GDPR, HIPAA, PCI-DSS).
Our Clients Specific Projects (Impact) In this role you'll go beyond traditional development to shape the digital backbone of how the company serve clients and innovate in energy: Lead the CRM transformation - redesign the system, integrate with A2, and explore tools like Drive AI innovation - embed AI into A2, SmartView, and other platforms while guiding secure employee use.
Build smarter onboarding and tender solutions - streamline client onboarding and strengthen IT security responses.
Transform data management - collate, clean, and prepare large datasets for seamless integration and reporting.
Create customer-focused SmartSolar tools - deliver engaging displays of solar and energy insights.
Enhance intranet and portals - improve templates, layouts, and user experience across internal systems.
Unlock A2 data with APIs - deliver powerful, custom-built reports for internal and external stakeholders.
Expand our digital presence - contribute to the evolution of the company website and online platforms.
Required Skills and Experience 5-10 years' experience in full stack development.
Deep expertise in: Front-end: React, Angular or Vue, TypeScript/JavaScript, HTML5, CSS3.
Back-end: Node.js, .
NET, or Java.
Databases: SQL Server, PostgreSQL, or equivalent.
API development and integrations.
Proven experience in secure coding practices, embedding security into the design, development, and deployment of applications.
Experience with security monitoring, logging, and vulnerability management tools, with the ability to detect and mitigate threats in real time.
Familiarity with compliance standards and regulatory frameworks such as ISO 27001, GDPR, HIPAA, and PCI-DSS.
Experience delivering enterprise-grade applications end-to-end.
Proven ability to design clean, secure, and scalable architectures.
Knowledge of cloud platforms (AWS, Azure, GCP).
Strong problem-solving skills and the ability to work across technical and business teams.
Experience and skills with CRM platforms (A2, Salesforce, ACT or ).
Bonus Skills Experience with AI, renewable energy platforms, or sustainability-focused systems.
Exposure to tender/compliance processes.
Why Join Our Client?
Lead end-to-end development projects with real-world impact.
Shape how AI, data, and digital platforms transform the energy and sustainability sector.
Work with a collaborative team where your ideas will influence strategy.
Hybrid flexibility + career growth in a stable, innovative business.