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Principal Frontend Developer React jobs in London· Page 6

Results 101–120 of 1,515 for “Principal Frontend Developer React” in London.

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Turner Townsend logo
Full-time|On-site|London

Role Overview Turner Townsend is seeking a Principal Consultant with deep experience in Consents Management to join the London team. This position leads projects where expert navigation of consent processes is essential. The role calls for strategic thinking and a strong grasp of regulatory frameworks. What You Will Do Lead consents management on complex pro…

Apr 16, 2026
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AECOM logo
Full-time|On-site|London

The Principal Consultant for Social Value will be an integral member of the Economics & Economic Development (EED) Team at AECOM, contributing to our Advisory business. This team operates across various sectors, such as energy, nuclear, transportation, water, residential, commercial development, and regeneration, having successfully engaged in prominent infrastructure initiatives like High Speed Two, Heathrow Airport, Sizewell C, and A303 Stonehenge.Key ResponsibilitiesAct as the Social Value Lead on diverse infrastructure projects.Design and implement social value strategies to fulfill client objectives.Create monitoring and evaluation frameworks to help clients measure performance against social value goals.Oversee the generation of professional social value reports for clients.Manage daily client interactions and coordinate with third-party contractors and stakeholders as necessary.Provide insights and guidance to clients to enhance social value outcomes on projects and promote best practices.Understand the procurement processes associated with large-scale infrastructure projects and identify social value opportunities.Identify and pursue new business development opportunities related to social value, including proposal preparation.

May 5, 2026
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Docker logo
Full-Time|On-site|London, UK

Join us at Docker, where we revolutionize app development, allowing developers to concentrate on what truly matters. Our remote-first global team thrives on innovation and enhancing the developer experience. With over 20 million monthly users and 20 billion image pulls, Docker stands as the premier tool for building, sharing, and running applications—trusted by both startups and Fortune 100 companies. As we rapidly expand, we're just getting started. Come aboard and enjoy this exciting journey!We are seeking a Principal Software Engineer (Docker Agents) to join our AI engineering team to shape the future of containerized AI agents. Docker containers provide the ideal environment for hosting and executing AI agents, ensuring isolation, portability, and reproducibility. You will work on our open-source project, cagent (https://github.com/docker/cagent), and enhance it to empower developers in building, deploying, and scaling intelligent agents utilizing Docker’s container technology.This is a unique opportunity to influence how developers harness containers for AI agents on a large scale. You will establish the technical vision, spearhead architectural decisions, and collaborate with engineers and leaders across Docker to integrate containerized agent capabilities into the developer experience.

Jan 20, 2026
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HubSpot logo
Full-time|Hybrid|Flex - London, United Kingdom

POS-23538Join HubSpot in our mission to empower organizations globally to achieve better growth. Our platform, trusted by businesses around the world, integrates marketing, sales, service, and operations in a flexible, secure, and user-friendly environment. We value autonomy, curiosity, and a thriving workplace culture.Meet the Team: Messaging Strategy Frontend (Messaging Product Group)The Messaging Product Group is responsible for the applications and infrastructure that support our marketing Email, SMS, and WhatsApp services. We operate at a significant scale, facilitating billions of messages each month. Our focus is on crafting reliable systems while innovating our product offerings to enhance customer outcomes.The Messaging Strategy Frontend team develops the essential customer-facing experiences that marketers engage with daily to create, manage, and publish marketing communications. This is the platform where marketers strategize campaigns, refine content, and make impactful decisions as they grow with HubSpot.As a Technical Lead II, you will act as both a leader and a mentor within this dynamic space, guiding the technical direction, influencing product execution, and supporting a small team in delivering high-quality user experiences that marketers depend on regularly.

Feb 12, 2026
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Elliptic logo
Full-time|On-site|London, United Kingdom

In the role of Principal Solutions Consultant, you will become a key technical strategist and a trusted advisor for Elliptic's most significant and intricate partners. Your mission will be to assist institutions in securely adopting digital assets and doing so with confidence.Key Responsibilities:Guide enterprise clients on matters of risk, compliance, investigations, cyber threat intelligence, and digital asset management solutions.Facilitate discovery and solution design sessions, converting business objectives, compliance needs, and system architectures into bespoke solutions from Elliptic.Oversee technical and business validation throughout the sales process, crafting and presenting engaging demos, proofs of concept, and executive presentations.Deliver hands-on technical direction regarding API integrations, data workflow design, architecture, troubleshooting, and best-practice implementations, all supported by comprehensive documentation.Collaborate with regional commercial teams—including Sales, Customer Success, GPRG, Intelligence, and Product Management—to assist customers in their evaluation, onboarding, and adoption processes.Act as a bridge between commercial and technical leadership by capturing and prioritizing customer insights that guide product features, integrations, and market strategies.Represent Elliptic at industry events and partner forums, showcasing thought leadership in blockchain analytics, compliance, and cryptocurrency risk management.Mentor colleagues within the Solutions Consulting community, aiding in complex deals and refining best practices.Contribute to shaping global processes and automation initiatives to enhance pre-sales and delivery excellence.

Feb 11, 2026
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Omnicom Health Group logo
Principal Medical Writer

Omnicom Health Group

Full-time|On-site|London, UK; Manchester, UK

Join our dynamic team at Omnicom Health Group as a Principal Medical Writer. In this pivotal role, you will lead the development of high-quality medical communications and publications that resonate with healthcare professionals and stakeholders. Your expertise will be instrumental in crafting engaging content that informs and educates, ensuring alignment with the latest scientific advancements and regulatory standards.As a Principal Medical Writer, you will collaborate with cross-functional teams, guiding junior writers and contributing to strategic project planning. Your ability to distill complex medical information into clear, impactful narratives will be key to our success.

Mar 15, 2026
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Beamery logo
Full-time|On-site|London, UK

Join Beamery as a Principal EngineerAt Beamery, we are at the forefront of revolutionizing the HR technology landscape with our cutting-edge transformational AI platform. Our mission is to empower enterprise organizations to make informed and equitable talent decisions. By streamlining recruitment processes, enhancing internal mobility, fostering effective upskilling initiatives, and enabling agile workforce planning, we help our clients successfully manage the hiring and redeployment of over a million individuals each year.We are excited about our future as we deepen our integrations with major platforms such as SAP, Workday, Microsoft, and LinkedIn, enhancing our skills intelligence and allowing our customers to plan more effectively for the future. We leverage proprietary LLMs and knowledge graph technology to broaden talent access, make fairer decisions, and create opportunities at scale. Our company culture, built on trust, empathy, and transparency, ensures that every team member can bring their authentic selves to work.What You'll DoAs a Principal Engineer at Beamery, you'll tackle complex challenges that have significant impact across the organization. Collaborating with fellow engineers, you will help establish the architectural standards necessary for executing Beamery's strategic vision.Design and develop architectural solutions while drafting RFCs for initiatives that affect Engineering and beyond.Maintain your hands-on expertise by assisting teams in delivering scalable and high-performance software.Collaborate with Product and Engineering Directors to plan, scope, and size large-scale projects and features that span multiple teams.Partner with other Principal Engineers to refine and evolve the architectural vision that aligns with Beamery's strategy.

Feb 12, 2026
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Intercom logo
Full-time|On-site|London, England

At Intercom, we're revolutionizing customer service through our advanced AI solutions. Our flagship AI agent, Fin, empowers businesses to deliver exceptional customer experiences, ensuring they're always available to assist users. When combined with our Helpdesk, Fin forms the Intercom Customer Service Suite, a comprehensive solution for addressing complex customer queries that require a personal touch.Since our inception in 2011, we have gained the trust of nearly 30,000 businesses globally, setting the standard for customer service excellence. Our commitment to innovation drives us to push boundaries and deliver unparalleled value to our clients.What’s the opportunity?As a Principal Engineer at Intercom, you'll take the lead in defining and executing key strategic initiatives. This role offers you the autonomy to impact the engineering organization significantly. You'll be responsible for developing both back-end and front-end systems, collaborating closely with designers, product managers, researchers, and data analysts. Additionally, you'll mentor and coach fellow engineers while partnering with Group Engineering Managers on technical strategy and leadership.What will I be doing?In this role, you will:Utilize your domain expertise to lead pivotal projects within our R&D organization.Provide insights on project progress, risks, and challenges to guide resource allocation and prioritization effectively.Contribute to our technical architecture, ensuring our systems scale to meet growing customer demands.Prioritize agility alongside scalability and availability, with a focus on continuous deployment and incremental releases.Engage in all software development phases, including ideation, prototyping, design, and implementation, balancing hands-on development with architectural leadership.Leverage state-of-the-art tools to enhance productivity and streamline problem-solving.

Jan 28, 2026
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Delta Capita logo
Full-time|On-site|London, Greater London, United Kingdom

PRINCIPAL CONSULTANT Location: London Employment Type: Permanent Role OverviewJoin our dynamic Consulting Business at Delta Capita, where you will collaborate with top-tier financial institutions, ensuring they receive unparalleled consulting services. As a Principal Consultant, your role will encompass direct client engagement as the primary liaison between customers and Delta Capita's Global Consulting team. Your extensive experience in change management, alongside a proven track record as a Principal Consultant or in a change management role within financial services, will be crucial. To explore our Consulting services further, click here.

Feb 24, 2026
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ifs1 logo
Full-time|On-site|London

ifs1 seeks a Lead or Principal DevOps Engineer based in London. This position centers on strengthening infrastructure to help deliver reliable systems and streamline operations. Key responsibilities Build and refine infrastructure solutions that support the team’s goals Design, implement, and maintain continuous integration and delivery pipelines Drive improvements in operational efficiency and system reliability Location This role is located in London.

Apr 22, 2026
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Capco logo
Full-time|On-site|UK - London

Join Capco as a Principal Architect specializing in Amazon Web Services (AWS) to lead transformative cloud initiatives. In this pivotal role, you will leverage your expertise to architect, design, and implement AWS solutions that meet our clients' evolving needs. Collaborate with cross-functional teams to enhance cloud strategies, ensuring alignment with business objectives.

Mar 12, 2026
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Egis Group logo
Full-time|On-site|London

Join our dynamic team as a Principal Electrical Engineer, where you will play a pivotal role in leading innovative electrical engineering projects. Your expertise will drive the development of cutting-edge solutions that enhance our infrastructure and contribute to sustainable engineering practices.As a Principal Electrical Engineer, you will collaborate with multidisciplinary teams, ensuring that all engineering designs meet the highest quality standards while adhering to safety regulations. Your leadership will inspire junior engineers and foster a culture of excellence within our engineering department.

Mar 12, 2026
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Galaxy Digital Services logo
Lending UI Developer - London

Galaxy Digital Services

Full-time|$160K/yr - $190K/yr|On-site|London

Galaxy Digital Services is searching for a Lending UI Developer to join the London team. This role sits at the intersection of finance and technology, focusing on digital assets and blockchain innovation. The company is known for its institutional digital assets platform, which covers trading, investment banking, asset management, staking, self-custody, and tokenization technologies. Galaxy also invests in and operates data center infrastructure that supports artificial intelligence and high-performance computing. The team brings together deep crypto expertise and institutional knowledge, working to shape the future of Web3 and AI under the leadership of CEO Michael Novogratz. What you will do Develop and maintain user interfaces for lending products within the digital assets platform Collaborate with teams across trading, asset management, and technology to build effective solutions Contribute to products that support blockchain and digital asset innovation Requirements Experience building UI for financial or digital asset platforms Comfort working in a collaborative, high-achieving team Based in or able to work from London Our values Strive for excellence Be selective for greater impact Maintain high alignment and allow for flexibility Encourage transparent disagreement Support independent decision-making Foster collaborative teams Galaxy Digital Services has offices in New York City and across North America, Europe, the Middle East, and Asia. Learn more about the company's products and businesses at www.galaxy.com.

Apr 24, 2026
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Newton Europe logo
Full-time|On-site|London, England, United Kingdom

Join our dynamic consulting team at Newton Europe, where we engage in rigorous diagnostics and multi-year transformation programs that promise tangible outcomes for our clients. To achieve this, we prioritize a deep understanding of our clients’ needs, enabling us to identify key improvement opportunities and design effective, sustainable solutions. Our work often requires travel during the week as we immerse ourselves in our clients' environments.As a Principal Consultant, you will spearhead complex transformation initiatives, delivering substantial value to clients, potentially worth around £5 million. You will lead a diverse team of consultants across various workstreams, while also establishing your presence as a thought leader within the organization. This role is also an opportunity to hone your business development skills through identifying prospects for future engagements.Your responsibilities will include:Managing a larger team (up to 8 members) on substantial programs or smaller engagements, including matrix management and designing workstreams in collaboration with your line manager.Guiding senior clients and stakeholders, assuring them of project progress to achieve complete satisfaction.Overseeing program governance, which encompasses reporting, risk management, and stakeholder engagement.Taking ownership of specific account plans and collaborating with other leads to define outcomes for connected workstreams.Leading your team in data analysis and modeling to identify opportunities and create compelling narratives to present to senior clients.Actively contributing to the development of your team, focusing on their career aspirations and supporting their professional growth.Identifying ways your project team can engage with broader market activities to enhance account engagement.Your successful recruitment will place you within one of our specialized Clusters: Defence & Infrastructure, Public, or Consumer. During your onboarding, your chosen cluster will ensure you are integrated into the appropriate client programs, providing the necessary support to align with Newton’s core program delivery approach.

Aug 18, 2025
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loveholidays logo
Full-time|On-site|London

Why Join the Technology Team at loveholidays?At loveholidays, we strive to innovate and lead the way in making travel accessible to all. Our mission is to provide customers with endless choices, unmatched convenience, and exceptional value for their vacations. Our technology team is the driving force behind our position as a personal holiday advisor, ensuring a smart and effortless getaway experience.Our technology is integral to our vision of becoming the global leader in packaged holidays. We are committed to pioneering cutting-edge innovations and achieving technical excellence that secures our future. Our systems manage trillions of holiday offers daily, enabling thousands of requests per second. Here, you can enhance your career by tackling complex challenges and expanding your expertise.Join us to make a meaningful impact in this exciting new chapter where you can take ownership of your success while contributing to our collective goals. We actively engage in discussions about technology and uphold key technology principles that have shaped our journey so far. As we expand our reach across Europe, we are seeking the brightest minds and the best technology to achieve our ambitious goals.The Impact You Will Make:Reporting directly to the Head of Analytics, the Principal Data Analyst will lead a high-performing team dedicated to delivering analytical solutions that address strategic questions, assess performance, and inform daily decision-making.Your Daily Responsibilities:Oversee a team of two analysts collaborating across various stakeholder groups, including operations, commercial, and platform.Serve as the primary analytics partner for the Supply domain, which is the commercial and technical engine that crafts the ideal holiday experience for our customers.Enhance the analytical influence on our strategic and tactical decisions, utilizing data to gain insights on performance optimization for both suppliers and customers.Establish benchmark standards for high-quality visualizations and reports using Looker and Looker Studio.Collaborate with stakeholders to develop measurement frameworks that reveal how our systems deliver value and identify opportunities for improvement.

Mar 11, 2026
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Capco logo
Full-time|Hybrid|UK - London

About the Role Capco seeks a Managing Principal to lead Finance Transformation within the Finance, Risk, Regulatory & Financial Crime (FRRF) practice in London. This senior position centers on guiding large-scale change for finance and treasury teams at Tier 1 institutions. The role blends strategic vision, client relationship management, and business development, with a focus on delivering measurable results for CFOs, Treasurers, and senior finance leaders. Main Responsibilities Direct end-to-end finance transformation programs, including finance IT, operating model design, and process improvement. Develop and implement strategic initiatives for CFOs and executive stakeholders to strengthen controls, boost efficiency, and enhance financial insights (such as ICAAP, ILAAP, RRP). Oversee regulatory transformation projects (including Basel, IFRS, PRA) to maintain compliance and support operational excellence. Work closely with technology and data teams to embed automation, cloud, and digital tools into finance operations. Support business development by building client relationships, leading delivery teams, and contributing thought leadership. Location London, United Kingdom

Apr 17, 2026
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Methods logo
Full-time|On-site|London, England, United Kingdom

Methods is a leading IT Services Consultancy with a revenue exceeding £100M, dedicated to transforming the public sector in the UK. With over 30 years of experience, we partner with various central government departments and agencies to enhance operational efficiency and effectiveness.Our unique approach combines technology, data, and a human touch, which distinguishes us from other consultancies, system integrators, and software houses. We are committed to delivering sustainable and impactful solutions for our clients, staff, communities, and the environment.At Methods, we cultivate a collaborative atmosphere that fosters skill-sharing and problem-solving while enjoying our work. We embrace challenges, learn from our experiences, and strive for excellence.While primarily serving the public sector, we are actively expanding our portfolio to include significant private sector clients. Methods became part of the Alten Group in early 2022.Role Overview: As a prominent digital transformation consultancy, Methods collaborates with public and private organizations to provide innovative and secure solutions. Our focus on governance, risk, and compliance (GRC) empowers businesses to navigate intricate security landscapes while maintaining regulatory and operational resilience.We are currently looking for a Principal Cyber Security Risk & Audit Consultant to join our dynamic team. This position is perfect for a professional with extensive expertise in cyber security, risk management, and internal audit. Candidates should possess experience in both public and private sectors, ideally with a background in management consultancy. Strong leadership and team-building skills are highly preferred.

Mar 5, 2026
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Capco logo
On-site|On-site|UK - London

Lead Principal Security EngineerLocation: London (Hybrid) | Practice Area: Technology & Engineering | Type: PermanentShape the future of digital finance by spearheading cutting-edge cybersecurity initiativesThe RoleAs a Lead Principal Security Engineer at Capco, you will spearhead the design, implementation, and integration of comprehensive security frameworks across both cloud and on-premise environments. Your primary responsibility will be to collaborate with engineering and client teams to integrate security best practices throughout the Software Development Life Cycle (SDLC), while enhancing our capabilities in vulnerability management, compliance, and secure architecture.What You’ll DoLead enterprise-wide security initiatives utilizing SAST, DAST, SCA, and container scanning tools such as CheckmarxOne and Prisma Cloud.Design and implement secure cloud infrastructures, endpoint protection measures, and data encryption strategies.Champion secure-by-design principles and integrate security tools into CI/CD pipelines.Conduct comprehensive security audits, vulnerability assessments, and threat analyses across all systems.Mentor engineering teams on secure development practices and help build Capco’s internal security knowledge repository.What We’re Looking ForExtensive experience in application and cloud security across AWS, Azure, or GCP.Proven proficiency in integrating SAST, DAST, SCA, and container scanning solutions.In-depth knowledge of data protection methodologies, including encryption and data masking techniques.Familiarity with industry standards and frameworks such as ISO 27001, NIST, and OWASP.Programming skills in languages such as Python, Java, or Go.Bonus Points ForRelevant certifications, including CISSP, CSSLP, or cloud-specific security credentials.Experience in mentoring security engineers or contributing to RFPs and thought leadership initiatives.Exposure to secure DevOps (DevSecOps) practices and compliance frameworks.Experience with tools like Prisma Cloud, CheckmarxOne, or their equivalents.Exceptional stakeholder engagement and communication skills.

Feb 4, 2026
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AECOM logo
Full-time|Hybrid|London

Begin your journey here. Advance your career with us.AECOM seeks an experienced Principal Civil Engineer to lead technical initiatives across a variety of projects for data center clients. These projects encompass site due diligence assessments, master planning, detailed design, and construction support. This role is pivotal in fostering business growth, enhancing client relations, and advancing AECOM's civil engineering capabilities within the data center sector.As part of our Civil Engineering Business Unit, you will collaborate with a diverse team of professionals, including ground engineers, structural engineers, mechanical engineers, electrical engineers, architects, project managers, environmental specialists, and surveyors, both locally and globally, to support our extensive portfolio of data center projects.In the Data Centres Market Sector, you will represent AECOM as a knowledgeable ambassador, delivering expert civil engineering counsel throughout EMEA and in conjunction with global teams. Your contributions will ensure the successful execution of data center projects for major technology clients, emphasizing technical excellence, resilience, and cross-disciplinary integration while reinforcing AECOM's standing in the Hyperscale and Co-location data center market.Your responsibilities will include:Providing strategic civil engineering leadership and technical governance for data center projects, ensuring adherence to AECOM standards and regulatory requirements.Leading, reviewing, and approving civil engineering infrastructure designs and specifications, creating viable solutions for site development, earthworks, drainage, pavements, access, utility infrastructure, and civil engineering works related to data centers.Coordinating with fellow civil engineers and technical experts to ensure the successful delivery of our data center project portfolio, collaborating with ground engineers, electrical engineers, mechanical engineers, structural engineers, project managers, architects, and environmental consultants across the UK and internationally.Enhancing client engagement, driving business development, strategic asset planning, and sector thought leadership, while mentoring and developing civil engineers to improve technical capabilities and delivery excellence within the Data Centres sector.Join us and thrive:At AECOM, we value our employees and offer a variety of core and personalized benefits tailored to support your future and well-being. Enjoy career development opportunities, a flexible hybrid working model to achieve work-life balance, access to technical practice networks, AECOM University, and opportunities for volunteering.

Feb 27, 2026
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ComplyAdvantage logo
Full-time|On-site|London, England, United Kingdom

The RoleWe are seeking a Principal Product Manager to take the lead on our Payment Screening product within the Risk Applications team. This senior individual contributor position entails significant commercial accountability; you will be responsible for driving business outcomes in your domain, focusing not just on delivery but on overall success.Payment screening serves as a critical compliance mechanism, necessitating that financial institutions and other entities screen payments for regulatory and compliance risks in real-time prior to processing. The landscape is well-established, with a mature market and clear requirements. ComplyAdvantage has a loyal customer base for screening and has recently unveiled a new version of its payment screening product, built on our robust, scalable, and AI-driven Mesh platform. As the Principal Product Manager, you will likely engage with this latest offering as it launches, addressing the strong demand for enhanced features from our commercial teams and managing the transition for customers currently utilizing the legacy platform.This position focuses on growth and scalability rather than developing a product from scratch. A modern and sophisticated version of the product is already available, and your role will involve determining the next steps: identifying features that unlock maximum commercial value, overseeing the migration of existing customers to the new platform, and ensuring the product remains competitive against established players while addressing immediate field needs. If you have experience evolving a product through rapid iterations to achieve a competitive market position, this role will resonate with you.You will collaborate within a dedicated squad alongside an engineering manager and technical engineers. As the Principal Product Manager, you will lead product decisions within the team, owning customer requirements, competitive insights, and commercial rationale. Your engineering counterpart will manage architecture, sizing, and implementation, working alongside you as peers, but you will set the product specifications within Risk Applications.Operating within a structured product operating model with clear decision-making authority, you will translate your product area into actionable plans with measurable outcomes. Each squad represents a significant engineering investment, and you are expected to weigh your product decisions in terms of investment versus expected commercial returns. If you have previously worked in organizations where product management is methodical and accountable, this environment will feel familiar. However, if you seek a role with complete strategic autonomy and no governance framework, this position may not be the right fit for you.What You Will DoOwn the payment screening product area with a General Manager mindset.

Mar 11, 2026

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