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What you'll do: You will develop algorithms, FPGA firmware, and data acquisition systems for CMS online luminosity measurement, beam monitoring, and Tracker calibration for the High Luminosity LHC, and coordinate such developments. This involves Integrating and commissioning back-end systems for luminosity and tracking detectors, enabling real-time data processing and precision luminosity measurements. Your responsibilities: - Develop, deploy, and maintain firmware and real-time algorithms for back-end electronics across multiple CMS board platforms, including systems for the Fast Beam Conditions Monitor (FBCM), Inner and Outer Tracker online luminosity, to support luminosity measurement, beam monitoring, and lumi-trigger generation. - Validate front-end detectors (including FBCM and Tracker modules) and back-end electronics through laboratory testing, ensuring end-to-end system performance from detector to data output. - Execute detector functional tests during detector integration at the Tracker Integration Facility, ensuring system readiness prior to installation. - Organise and lead test campaigns, including preparatory activities, on-site coordination of participants, and systematic validation of hardware, firmware, software and detector response. - Lead studies of detector efficiency, calibration quality, and operational stability, through measurements and simulations. - Coordinate technical interfaces across detector, trigger, timing, and data acquisition domains to ensure system integration. - Supervise and mentor students and fellows, including recruitment and structured technical guidance. - Anticipate upcoming technical and operational needs, structuring workflows, preparing infrastructure, and engaging with collaborating institutes to ensure continuity of operations. Your profile: - Hands-on experience with detector laboratories, electronics prototyping, and test beam operations. - Strong experience in FPGA firmware development (VHDL or similar HDL) and real-time data processing, ideally in particle physics detectors. - Demonstrated ability to integrate and troubleshoot complex systems spanning firmware, software, and detector hardware, from the detector frontend through to the data output. - Experience with data analysis, detector efficiency and calibration studies, and the statistical methods relevant to performance evaluation. - Experience in supervising or mentoring students or junior colleagues, including selecting candidates and adapting guidance to individual strengths. - PhD or equivalent relevant experience in the field of Physics or a related field. You are asked to provide at least one reference letter as part of your application. Your skills: - Simulation, design and development of trigger, data acquisition chains: including FPGA-based electronics. - Simulation, design and development of (parts of) detectors. - Testing and validation of detector, accelerator and beam line components. - Analysis and optimisation of detector performance: through the interpretation of simulation and experimental data. - Solid understanding of electronics. - Strong organisational and planning skills, with the ability to anticipate needs, coordinate across teams, and lead activities under time pressure. - Effective communicator across multidisciplinary teams, able to maintain constructive working relationships and coordinate technical interfaces with diverse contributors. - Has a structured and organised approach towards work; is able to set priorities and plan tasks with results in mind. - Contributes to promoting a positive atmosphere in the team through an optimistic and constructive attitude; addresses issues. - Sets ambitious, challenging but realistic goals; is ready to take initiatives and calculated risks in the interest of CERN. - Makes timely decisions that balance systematic analysis with decisiveness; deals with difficulties in a timely manner. - Spoken and written English, with a commitment to learn French. Medical hazard: Exposure to electromagnetic fields under certain exposure conditions. Given the occupational health risks associated with this position, the selected candidate must obtain medical clearance before a contract offer is confirmed. Employment conditions: - A valid driving licence. - Work in Radiation Areas. - Interventions in underground installations. - Work during nights, Sundays and official holidays, when required by the needs of the Organization. Ideal start date: 01/10/2026 Contract duration (in months): 48 Grade range: 6 Benchmark job: 200140 - Applied Physicist
What you'll do: As a member of the CMS Safety Office, you will participate in all safety-related activities at the CMS experimental sites during the Long Shutdown 3, when both the detector and the infrastructure will undergo major upgrades. In particular, you will take a leading role in the technical review of all CMS fire extinguishing systems and safety monitoring systems to assess their design, coverage and suitability for the CMS upgrade. You will contribute to the review, testing, and commissioning of the CMS Alarm Action Matrix in collaboration with all the relevant stakeholders, as well as organise regular reviews of the systems and activities and guide risk assessments for the collaboration's teams. Your responsibilities: - Coordinate and supervise the installation, integration, and commissioning of safety-related infrastructure for CMS across its underground experimental and surface facilities on the French and Swiss sites. - Organise and follow up on the assembly, deployment, and commissioning of the CMS environmental monitoring system based on sniffers. - Lead the technical review, consolidation, maintenance, and follow-up of the CMS fire protection systems. Contribute to the definition, review, testing, and validation of safety system logic, in particular the CMS Alarm Action Matrix. - Interface with CMS Technical Coordination, subdetector teams, and safety link persons to ensure coherent implementation of safety requirements and proper integration of systems across multiple domains. - Support the preparation and follow-up of safety-related deliverables, including environmental monitoring systems and alarm management, ensuring traceability and consistency throughout the project lifecycle. - Participate in and guide activity reviews and related risk assessments within CMS. - Proactively contribute to the continuous improvements to the safety framework at the CMS experimental site, ensuring a safe working environment while streamlining safety processes and documentation to support the efficient execution of experimental activities. Still here? Let's make a quick check about: Your profile: - Experience with fire protection systems or environmental monitoring systems. - Extensive experience in the installation, integration, and commissioning of safety-related technical systems, preferably in a complex or multidisciplinary environment. - Experience in field-supervision, including installation follow-up, testing, and commissioning of complex systems. - Track record in activity safety supervision, risk assessment, and coordination of multiple stakeholders. Initial experience working with control and/or safety systems (e.g. monitoring systems, alarms, interlocks, or similar). - Knowledge of safety regulations and standards in an international environment. - Proven ability to work successfully within multinational and multicultural teams of scientists, engineers and technicians. - Master's degree or equivalent relevant experience in the field of Mechanical Engineering, Health, Safety and Environment Engineering or a related field. Certificates in Safety Management (e.g. Nebosh) would be an advantage. Your skills: - Safety conformity assessment. - Occupational safety and risk management. - Knowledge of design codes and compliance verification of mechanical equipment. - Maintenance management. - Process analysis, definition and improvement. - Operation and support of experimental facilities. - Drives work / projects along and sees them through to their conclusion. - Contributes to promoting a positive atmosphere in the team through an optimistic and constructive attitude; addresses issues. - Takes initiative beyond regular tasks and makes things happen. - Adapts quickly and resourcefully to shifting priorities and requirements. - Ensures that information, procedures and decisions are appropriately documented. - Spoken and written both English and French. Medical hazard: Exposure to electromagnetic fields under certain exposure conditions. Given the occupational health risks associated with this position, the selected candidate must obtain medical clearance before a contract offer is confirmed. Employment conditions: - A valid driving licence. - Work during nights, Sundays and official holidays, when required by the needs of the Organization. - Interventions in underground installations. - Work in Radiation Areas.
About 1st Formations At 1st Formations, we empower entrepreneurs to start, run, and grow their businesses with confidence. Running a business shouldn’t be slowed down by company formation, statutory compliance, accounting, or payroll. From day one, these essentials should be seamless, reliable, and intelligently handled — freeing founders to focus on building and scaling. We’re a leading UK provider of company formation and compliance services, building a modern, fully integrated technology platform that supports founders at every stage of their journey. Our platform brings together formation, compliance, accounting, payroll, and ongoing business support in one cohesive experience. No stitched-together services. No legacy workflows disguised as software. Just a single, scalable platform built for ambitious founders who want to move fast, stay compliant, and grow with confidence. Why Join Us Now? You’ll be joining a business with strong momentum, clear direction, and real opportunity for progression. * £18m annual revenue, including £9m ARR * Over 1 million companies formed * Certified B Corp and Carbon Neutral Business * Forecast to grow 5x–10x over the next three years The Role We're seeking a Senior Frontend Engineer who combines technical excellence with a sharp eye for detail and a passion for delivering beautiful, pixel-perfect user interfaces. In this role, you'll play a critical part in shaping the user experience of our product by transforming high-fidelity designs into seamless, responsive, and accessible web applications using React and Next.js. You'll work closely with our product and design teams to shape the architecture of our frontend systems at the UK's leading company formation agent — 1 million+ companies formed since 2014. Key Responsibilities · Develop, maintain, and optimise high-quality, responsive, and performant web applications using React and Next.js, ensuring a consistent experience across devices and browsers * Collaborate closely with product designers to translate Figma mock-ups into seamless, visually polished interfaces that meet both aesthetic and functional requirements * Write clean, maintainable, and efficient code adhering to modern development standards, accessibility guidelines, and industry best practices * Contribute to frontend architecture — defining scalable patterns, reusable components, and maintainable structures to support long-term product growth * Participate in code reviews and technical discussions, sharing knowledge and upholding code quality and consistency across the engineering team * Continuously improve application performance through profiling, optimisation, and modern tooling and techniques * Stay current with the latest trends and advancements in frontend development, particularly within the React / Next.js ecosystem What we are looking for * 10+ years building modern web applications, with deep production expertise in React and Next.js * Expert-level JavaScript and TypeScript, plus strong HTML and CSS — including responsive layouts, accessibility, and cross-browser compatibility * In-depth experience with Payload CMS * Proven ability to translate Figma designs into pixel-perfect, maintainable frontend code * Experience with analytics, A/B testing, and data-driven methods to understand user behaviour and inform feature development * Solid understanding of frontend performance — able to identify bottlenecks and implement effective solutions * Proactive, self-driven, and highly accountable — you take initiative, follow through, and hold yourself to a high standard * Grit and drive — comfortable diving into complex problems, experimenting, and iterating to find the best solution * Collaborative team player who thrives in a fast-paced, high-growth environment What We Offer * £90- £110k and comprehensive benefits package * Hybrid working model * Real opportunities for progression as the business scales * The chance to influence both customer experience and product development * A culture that values ownership, impact, and continuous learning Equal Opportunities 1st Formations is an equal opportunity employer and is committed to creating a diverse and inclusive workplace. We consider all applicants for employment without regard to race, colour, religion, sex, national origin, sexual orientation, age, citizenship, marital status, criminal history, disability, or gender identity. We encourage individuals from all backgrounds to apply. If you have a disability or special need that requires accommodation, please let us know.
About 1st Formations At 1st Formations, we empower entrepreneurs to start, run, and grow their businesses with confidence. Running a business shouldn’t be slowed down by company formation, statutory compliance, accounting, or payroll. From day one, these essentials should be seamless, reliable, and intelligently handled — freeing founders to focus on building and scaling. We’re a leading UK provider of company formation and compliance services, building a modern, fully integrated technology platform that supports founders at every stage of their journey. Our platform brings together formation, compliance, accounting, payroll, and ongoing business support in one cohesive experience. No stitched-together services. No legacy workflows disguised as software. Just a single, scalable platform built for ambitious founders who want to move fast, stay compliant, and grow with confidence. Why Join Us Now? You’ll be joining a business with strong momentum, clear direction, and real opportunity for progression. * £18m annual revenue, including £9m ARR * Over 1 million companies formed * Certified B Corp and Carbon Neutral Business * Forecast to grow 5x–10x over the next three years The Role HubSpot is core to how the business runs, spanning customer service, sales, retention, compliance and marketing. We're looking for someone who can both build on the platform and think strategically about it- writing custom code and integrations where standard configuration falls short, while keeping a clear view of HubSpot's evolving feature set to inform what we build next and why. This is a hands-on technical role with a strategic edge, sitting within the Operations Team and working closely with the Director of Operations to turn business problems into HubSpot solutions, and HubSpot capability into business opportunity. Key Responsibilities Technical delivery * Design, build and maintain custom code on HubSpot (workflow actions, serverless functions, custom objects) and API-based integrations with third-party systems (e.g. identity verification, Companies House, billing) * Own technical delivery of HubSpot projects end to end — scoping, build, testing, deployment * Build and maintain integrations with other tools in the stack, ensuring data integrity and reliable sync * Troubleshoot HubSpot workflows, automations and integrations, liaising with vendors and developers as needed * Document all custom builds so solutions remain supportable beyond the original developer Strategy & capability planning * Maintain current knowledge of HubSpot's feature set across all Hubs and licensing tiers, including new/beta features * Translate platform capability into practical opportunity, identifying where HubSpot can replace manual process or unlock new functionality * Feed technical input into the HubSpot roadmap and advise on build vs. buy vs. configure decisions * Track the wider HubSpot ecosystem (App Marketplace, partner integrations, AI features) and flag relevant developments Collaboration & leadership * Partner with the Director of Operations to align technical builds with the CI Programme and business priorities * Act as the technical point of contact for HubSpot across Customer Service, Compliance, CoSec, Retention and Outbound Sales * Manage relationships with HubSpot and third-party development vendors, including scoping and reviewing delivery * Mentor and direct junior technical/CRM resource as the role grows What We Are Looking For * Proven experience building custom code on HubSpot (custom coded actions, serverless functions) and working with the HubSpot API * Strong working knowledge of HubSpot CRM across multiple Hubs, including workflows, automation, custom objects and reporting * Experience integrating HubSpot with third-party systems via API or middleware * Comfortable working independently to scope and deliver technical solutions, while keeping non-technical stakeholders informed in plain language * Strong analytical mindset: able to assess a business problem and judge the right technical or platform-led solution * HubSpot certifications (e.g. CMS for Developers, Platform Consulting) * Experience in a regulated, compliance-heavy, or operations-led environment * Familiarity with identity verification or KYC tooling (e.g. Onfido) * Exposure to Lean / continuous improvement methodology * Front-end development experience (JavaScript, HTML/CSS) for CMS or custom UI work What We Offer * £60-70k and comprehensive benefits package * Hybrid working model * Real opportunities for progression as the business scales * The chance to influence both customer experience and product development * A culture that values ownership, impact, and continuous learning Equal Opportunities 1st Formations is an equal opportunity employer and is committed to creating a diverse and inclusive workplace. We consider all applicants for employment without regard to race, colour, religion, sex, national origin, sexual orientation, age, citizenship, marital status, criminal history, disability, or gender identity. We encourage individuals from all backgrounds to apply. If you have a disability or special need that requires accommodation, please let us know.