X4 Technology

About the Company

X4 Technology focus on helping you succeed by connecting the right people and providing the data and insights to help execute your strategic priorities.

Our consultants will help you align your people strategy to your business objectives, and guide you with simplicity through the process.

Core industries: Consumer Markets, Financial Services, Healthcare, Life Sciences & Technology

Get in touch to find out more: Contact@x4-technology.com

United Kingdom:
T: +44 2078 127 700

United States:
T: (718) 360-0570

Germany:
T: +49 301 6638 9697

Listed Jobs

Company Name

X4 Technology

Job Title

Full-Stack Node.js/React Developer

Job Description

Job Title: Full‑Stack Node.js/React Developer Role Summary: Lead the development of a modern web platform using Node.js, React (Next.js preferred), and an API‑first architecture for a regulated FinTech. Responsible for rebuilding client‑facing applications, integrating with legacy Ruby services, and implementing secure, multi‑tenant authentication. Expactations: * Deliver high‑quality, scalable full‑stack solutions with minimal supervision. * Communicate technical decisions clearly to product managers and business stakeholders. * Maintain a security‑first mindset, ensuring compliance with regulatory standards for handling sensitive financial data. Key Responsibilities: * Design, develop, and deploy the new Node.js/React client stack (Next.js experience a plus). * Build APIs and middleware to integrate with existing Ruby services. * Implement OIDC/OAuth based secure authentication for multi‑tenant environments. * Create polished, accessible financial UIs and contribute to overall frontend UX design. Required Skills: * 3–5 years of full‑stack web development experience. * Strong backend expertise in Node.js, middleware, and API design. * Deep React.js proficiency, modern state‑management patterns, and component architecture. * Solid understanding of frontend usability, accessibility, and polished UI styling. * Hands‑on experience with OIDC/OAuth flows in multi‑tenant systems. * Security‑aware mindset for sensitive data handling and regulatory constraints. * Excellent communication and stakeholder presentation skills. Required Education & Certifications: * Bachelor’s degree in Computer Science, Software Engineering, or equivalent professional experience. * No mandatory certifications specified, but relevant credentials (e.g., Certified Scrum Developer, AWS Certified Developer) are a plus.

London, United kingdom

Hybrid

Junior

04-11-2025

Company Name

X4 Technology

Job Title

Lead Embedded Software Engineer

Job Description

Job Title: Lead Embedded Software Engineer Role Summary: Lead the development and enhancement of firmware for smart home devices, ensuring seamless integration of embedded systems with cloud and mobile platforms. Expactations: Own end‑to‑end product lifecycle from prototype to production, drive technical strategy, and deliver high‑quality, OTA‑capable firmware in a fast‑paced, cross‑functional environment. Key Responsibilities • Design, implement, and extend drivers for STM32 microcontrollers. • Integrate BLE/Wi‑Fi connectivity and OTA firmware update mechanisms. • Interface low‑level firmware with cloud services and mobile applications. • Validate and test firmware in prototype and production hardware. • Collaborate with hardware, QA, and cloud teams to meet product milestones. Required Skills • Strong proficiency in Embedded C/C++ and Embedded Linux. • Experience with STM32 or similar microcontrollers. • Hands‑on BLE and Wi‑Fi stack implementation. • Knowledge of OTA firmware update processes. • Familiarity with telemetry data syncing and cloud integrations. • Comfortable using AI‑assisted development tools (e.g., AI Cursor/Codex). Required Education & Certifications • Bachelor’s degree in Electrical Engineering, Computer Science, or related field. • (Preferred) Certifications in embedded systems or real‑time operating systems.

Birmingham, United kingdom

On site

Senior

12-11-2025

Company Name

X4 Technology

Job Title

Contract Test Leads (Energy Trading)

Job Description

Job Title: Contract Test Lead – Energy Trading Transformation Role Summary: Lead testing initiatives for a global energy trading and risk management (ETRM) transformation programme, ensuring end‑to‑end quality across functional, user acceptance, and non‑functional delivery. Expectations: - Deliver high‑quality testing outputs on schedule, supporting a multi‑year platform transformation. - Innovate testing practices, enhancing manual, functional, and automation capabilities. - Collaborate with programme and business teams to translate requirements into testable artefacts. - Drive non‑functional testing strategy, including performance and disaster recovery testing. Key Responsibilities: - Own end‑to‑end test planning, design, execution, and defect management for the portfolio. - Develop and maintain test scripts, scenarios, and execution schedules for functional and UAT cycles. - Define and implement non‑functional testing approaches, including performance, scalability, security, and resilience tests. - Lead and mentor testing teams, ensuring adherence to quality standards and continuous improvement. - Coordinate with stakeholders to verify that requirements are fully testable and to resolve ambiguities. Required Skills: - Proven experience leading functional and UAT testing in complex, regulated environments (e.g., finance, energy, telecom). - Strong knowledge of test management tools, defect tracking systems, and automation frameworks. - Excellent analytical, problem‑solving, and communication skills. - Ability to drive innovation in testing practices and to influence cross‑functional teams. - Experience with performance testing tools (e.g., JMeter, LoadRunner) and disaster recovery testing methodologies. Required Education & Certifications: - Bachelor’s degree in Computer Science, Engineering, Information Systems, or related field. - Professional certifications such as ISTQB Advanced Test Manager, CSM, or equivalent preferred.

London, United kingdom

Hybrid

13-11-2025

Company Name

X4 Technology

Job Title

Contract AI Engineer (Energy)

Job Description

**Job title:** Contract AI Engineer (Energy) **Role Summary:** Senior AI Engineer contracted to deliver AI‑driven solutions across upstream and downstream energy operations, including reliability, corrosion, well and reservoir management, IIoT sensing, ERP, and trading platforms. Focus on designing, building, and deploying high‑performance AI systems that produce measurable business impact. **Expactations:** - Deliver end‑to‑end AI projects from concept through production. - Demonstrate leadership in AI architecture and scalable deployment. - Influence cross‑functional teams and stakeholders with data‑driven insights. - Keep knowledge current on cutting‑edge AI research, especially LLMs and generative models. **Key Responsibilities:** - Design and develop AI/ML models (deep learning, GNNs, object detection, sensor fusion, embeddings, RAG, generative AI). - Deploy models on cloud platforms ensuring scalability and high performance. - Provide architectural guidance for autonomous, self‑learning systems. - Collaborate with engineers, data scientists, and business units to optimize decision‑making. - Lead technical discussions and deliver thought leadership on AI advancements. **Required Skills:** - Advanced Python programming and experience with AI/ML libraries (PyTorch, TensorFlow, etc.). - Proficiency in cloud services for training, deployment, and scaling of models. - Strong communication and influence skills. - Ability to translate business problems into AI solutions. **Required Education & Certifications:** - Bachelor’s or Master’s degree in Computer Science, Engineering, Mathematics, Statistics, or related STEM field. - 5+ years of industry or engineering experience delivering AI solutions.

London, United kingdom

Hybrid

Mid level

16-11-2025