Senior Fullstack Engineer (Applied AI) at Contentsquare | London

Join Contentsquare, a pioneering experience intelligence platform, where we empower organizations to gain deep insights into their customers' digital journeys. Our innovative and scalable platform is designed for users across various expertise levels, making it easier to navigate the complexities of online interactions.As a global leader in experience analytics, we operate from 15 offices worldwide, committed to making a significant impact in the industry. We are seeking enthusiastic team members who are ready to contribute to our growth and success.At Contentsquare, we foster an inclusive work environment where every individual can thrive. Our community is built on values of courage, empathy, and intentionality, aimed at simplifying challenges for our clients, their customers, and each other.Note: Please be cautious of scam attempts impersonating Contentsquare. We do not request money or communicate through unsolicited messages. For further details, check our careers blog.Important Information:1. This is a software engineering position requiring a minimum of 5 years of relevant experience, particularly in TypeScript. While we utilize Large Language Models (LLMs), this is not a machine learning-focused role.2. The role is available as remote (in France, Spain, Italy, Poland, or Germany) or can be hybrid in our offices located in Barcelona, Paris, Milan, Munich, or Cairo.We are on the lookout for a Senior Fullstack Engineer (Applied AI) to engage in various innovative projects that harness the power of AI, especially leveraging LLMs. One of the key initiatives involves enhancing our AI CoPilot tool (currently exclusive to Heap) to broaden its application, allowing users with no prior experience in product or digital experience analytics to easily find answers through simple inquiries.Our rapid advancement in utilizing LLMs aims to streamline insights generation and simplify setup processes, among other enhancements. As our next Senior Software Engineer (Applied AI), you will play a significant role in product development and initial product iterations, participating in user interviews to validate product hypotheses.This position offers a unique opportunity to operate within a “startup-like” environment, where we swiftly transition from concept to proof of value, ensuring that our solutions deliver real benefits to our clients.

Join us as a Senior AI FullStack Engineer at a rapidly expanding AI FinTech company, where your expertise will help shape the future of finance.About Us:We develop and deploy AI-powered tools and intelligent agents throughout their entire lifecycle, from conception to production.Our systems are designed with AI at their core, not as an afterthought.Transform experimental concepts into production-ready features that impact real users.Take ownership of projects from problem identification to user adoption.Collaborate closely with engineering and product teams to seamlessly integrate AI into daily operations.Establish effective methodologies for implementing AI in production environments.We are on a mission to create an AI-native bank tailored for ambitious businesses.Your Contribution:Train and refine large-scale audio and multimodal models.Design and execute experiments focused on architecture, data mixtures, and training strategies.Develop and enhance audio data pipelines.Optimize inference speed, latency, and overall production readiness.Deploy models in end-to-end, low-latency settings.Create meaningful evaluation metrics that go beyond standard benchmark scores.Work collaboratively with both research and engineering teams.This role is hands-on, bridging the gap between research and real-world application.Technical Environment:PythonLarge Language Models (LLMs) and AI toolsPostgreSQL, BigQueryTypeScript, ReactAWS, GCPDocker, Terraform, GitHub(Detailed technical stack will be shared during the interview process)Your Expertise:5+ years of experience in building and deploying production systems.Full-stack or deep backend/platform engineering skills.AI-native mindset: you leverage AI in your daily work and think in terms of agents, workflows, and automation.Product-focused: your priority is user adoption over mere output.You excel at transforming complex challenges into scalable solutions.Bonus Skills:Experience in financial technology.Familiarity with cloud services and infrastructure.Contributions to open-source projects.

Role overview The Senior Applied AI Engineer at Taktile will play a central part in building and refining AI-driven solutions for the company's product suite. This position requires direct involvement with AI models and regular collaboration with colleagues across different teams. The work will help guide both the technical and product direction at Taktile. What you will do Design, develop, and implement applied AI models to enhance Taktile’s products. Collaborate with engineering, product, and other teams to take AI features from initial idea to production deployment. Participate in shaping product and AI strategies through active contribution to team discussions and decision-making. Location This is an in-office role based at Taktile’s London location.

Role Overview bluefishai is looking for a Senior Applied AI Engineer to help shape how AI is implemented and integrated across the company. This position focuses on driving projects that improve developer productivity, streamline workflows, and introduce new product capabilities. The work is highly cross-functional and centers on delivering measurable business results. Key Responsibilities Lead initiatives that bring structure and clarity to AI adoption, setting standards for teams as they experiment with new approaches. Work closely with engineering, product, and leadership to identify impactful AI use cases and integrate them into the software development lifecycle. Advise on the application of emerging technologies, including agentic capabilities, to both products and internal processes. Mentor engineers, define best practices, and guide teams in adopting AI solutions that scale across the organization. Encourage collaboration and help align teams around practical, measurable solutions that boost productivity. Collaboration and Reporting This role reports directly to the VP of Engineering. Regular collaboration with engineering, product, and leadership teams is expected to ensure AI initiatives are impactful and aligned with business goals. Work Environment bluefishai is in the early stages of its AI journey, with a strong sense of curiosity and momentum. Teams are experimenting with different methodologies, and this role will be central in establishing effective, scalable AI practices across the company. Location This position is based in London or can be performed remotely within the UK.

Join a pioneering journey in AI innovation!We are seeking a Founding Applied AI Engineer to be part of our client’s dynamic team in London. As an early hire in a rapidly growing startup moving from Seed to Series B funding, you will play a crucial role in shaping the future of intelligent systems.

Founded in 2018, Causaly is at the forefront of transforming enterprise-scale scientific research through our innovative AI platform. Our technology empowers researchers to efficiently discover, visualize, and interpret biomedical knowledge, streamlining critical research workflows to tackle some of the most pressing health challenges of our time.We partner with leading biopharma companies and institutions, focusing on diverse use cases including Drug Discovery, Safety, and Competitive Intelligence. Visit our blog to learn how we enhance knowledge acquisition and decision-making: Blog - CausalyCausaly is proudly backed by renowned venture capital firms, including ICONIQ, Index Ventures, Pentech, and Marathon.

About UsAt Lightning AI, we are the pioneers behind PyTorch Lightning, established in 2019. Our mission is to create a seamless end-to-end platform that simplifies the development, training, and deployment of AI systems, effectively bridging the gap between research and production.Following our merger with Voltage Park, an innovative neocloud and AI Factory, we deliver developer-centric software integrated with cost-efficient, large-scale computing. Our solutions empower teams with essential tools for experimentation, training, and production inference while ensuring robust security, observability, and control.We cater to a diverse clientele, including independent researchers, startups, and major enterprises. With global operations and offices located in New York City, San Francisco, Seattle, and London, we are backed by prestigious investors such as Coatue, Index Ventures, Bain Capital Ventures, and Firstminute.

About LawhiveAt Lawhive, we are committed to democratizing access to legal services. Our innovative online platform empowers consumers and small businesses to obtain legal assistance at a fraction of traditional law firm costs. We seamlessly integrate human expertise from regulated lawyers with our pioneering AI lawyer, designed specifically for consumer legal matters.We believe that equal access to legal resources is one of the most significant societal challenges today. Our mission is to level the playing field, ensuring that legal assistance is as accessible as essential utilities.Our AI lawyer, Lawrence, is powered by our proprietary fine-tuned LLM, which has successfully passed the UK bar exam equivalent.Supported by leading venture capital firms in the US and UK, including Google Ventures, Balderton Capital, and TQ Ventures, we recently raised $40M in Series A funding to bolster our international expansion and grow our dynamic team, marking one of the largest Series A rounds in Europe for 2024.The RoleWe are on the lookout for a Senior Applied AI Engineer to become a pivotal member of our AI Engineering & Infrastructure team. In this role, you will be instrumental in deploying our latest AI-powered features and services at scale, enhancing our infrastructure, and ensuring the robustness of our solutions in production. Collaborating closely with AI researchers, software engineers, and product teams, you will bridge the gap between state-of-the-art AI research and its practical applications.

Pleo creates tools that simplify business spending for finance teams and employees. With over 40,000 customers and a diverse team of more than 850 people from 100+ nationalities, the company continues to grow and refine how organizations manage expenses. Curiosity about customer needs, a drive to untangle complexity, and high standards shape the way work gets done at Pleo. Role overview The Staff Applied AI Engineer will play a key part in building the next wave of AI-powered features at Pleo. This position focuses on using rich spend data to deliver meaningful product improvements. Collaboration is central: expect to work closely with software engineers, data engineers, and data scientists to move prototypes into production and create real value for customers. Team structure and collaboration This role is part of the data team, which includes a Staff Data Platform Engineer and a Staff Data Scientist. Each member brings specialized expertise. The Staff Applied AI Engineer’s primary responsibility is applied AI engineering and contextual data analysis. The position reports to the Director of Data Product and works with multiple product squads to help shape and launch AI-driven features across Pleo. What you will do Partner with product engineers and data experts to design and build AI-driven products, including spend intelligence tools, automated processes, and agentic workflows. Work with cross-functional teams to integrate AI capabilities into new and existing products, aiming for smooth adoption and practical value.

About UsAt Percepta, we are dedicated to revolutionizing essential industries through applied AI. Our goal is to harness cutting-edge technology to enhance sectors that drive the global economy, such as healthcare, manufacturing, and energy.To achieve this, we collaborate closely with top-tier clients, facilitating their AI transformation journeys. Our unique strengths include:Expertise in engineering, product development, and research.Mosaic, our proprietary toolkit designed for the swift deployment of intelligent workflows.Strategic alliances with industry leaders like Anthropic, McKinsey, AWS, and more.Our rapidly expanding team comprises Applied AI Engineers, Embedded Product Managers, and Researchers, all driven by the mission to integrate AI into tangible improvements in everyday life.Percepta operates as a direct partnership with General Catalyst, a global transformation and investment firm.Role OverviewWe are seeking Applied AI Engineers to engage with customer executives, operators, and technical teams to devise and implement impactful AI systems. As we expand our footprint in Europe, your role will be pivotal in shaping our strategic direction and success in the region. Unlike many roles that focus on prototypes or laboratory projects, you will be responsible for designing, building, and deploying production-grade AI agents and workflows that generate substantial business value for our clients.Key ResponsibilitiesDefine AI Vision: Partner with client stakeholders to outline their long-term AI strategy and transformation roadmap.Identify Opportunities: Work backward from the long-term vision to highlight and prioritize specific AI applications that translate our ambitions into measurable business outcomes.Deliver Real Products: Quickly develop and deploy AI solutions that operate effectively in real-world scenarios with actual users and data.Enhance Our Core Product: Integrate insights from customer engagements into our Mosaic product, consistently introducing new features, patterns, and frameworks.

About NevisNevis is pioneering the first-ever AI-driven wealth management platform, recently surpassing $50 billion in assets under management and projected to exceed $100 billion by year-end.Backed by prominent investors, Nevis has successfully secured $40 million in funding from Sequoia Capital, ICONIQ, and Ribbit, positioning itself as one of Europe’s most well-funded and rapidly expanding Series A startups.The RoleWe are on the lookout for an innovative and passionate Applied AI Engineer to join our dynamic team at Nevis. In this critical role, you will influence the development of our cutting-edge AI wealthtech product by creating LLM-driven automation solutions to tackle essential challenges faced by our corporate clients.You will engage with state-of-the-art LLM models, partnering with industry-leading vendors to enhance our product’s reasoning capabilities and achieve superior quality in our models’ outputs.Working alongside a distinguished team of engineers and product creators, including the ex-Head of AI at Revolut, you will have a unique opportunity to make a significant impact in one of the world’s largest industries.What You’ll DoDesign and develop LLM and ML-powered features for the Nevis platform.Collaborate with engineers and product teams to transition new AI capabilities from concept to production.Establish best practices for AI development, testing, observability, and reliability.Continuously assess and enhance AI product performance and reasoning accuracy.Work in tandem with product and design teams to prototype and refine new AI features.Stay abreast of advancements in Generative AI, including agentic systems and context engineering.Who You AreHands-on experience with LLMs.Demonstrated ability to solve real-world challenges using AI/ML.Strong statistical and data analysis skills.A STEM degree from a leading university.A passion for transformative AI technologies.A product-oriented mindset focused on practical solutions.

Artificial Intelligence is increasingly essential across all sectors of society. At Scale AI, our mission is to expedite the evolution of AI applications. For the past eight years, we have been at the forefront of AI data innovation, driving some of the most groundbreaking advancements in AI, such as generative AI, defense technologies, and autonomous vehicles. Following our recent Series F funding, we are enhancing the application of frontier data and models by developing sophisticated agents for enterprises globally through our Scale Generative Platform (SGP).The SGP ML team is at the forefront of the AI revolution. We engage directly with clients to design state-of-the-art products utilizing the extensive proprietary research and resources cultivated at Scale. As an Applied AI Engineer, you will collaborate with clients to develop machine learning solutions tailored to their business challenges. Your responsibilities will span from constructing next-generation AI cybersecurity firewalls to transforming AI experiences in journalism and employing foundational genomic models for life-saving drug protein predictions. Daily data-driven experiments will yield critical insights regarding model capabilities and deficiencies, which you will leverage to enhance product performance. If you are passionate about shaping the future of the AI landscape, we are eager to hear from you!

About AnthropicAt Anthropic, we are committed to developing safe, interpretable, and steerable artificial intelligence systems. Our mission is to ensure that AI technology is both reliable and beneficial for users and society at large. Our rapidly expanding team comprises dedicated researchers, engineers, policy experts, and business leaders collaborating to create impactful AI solutions.About the Role: As an Applied AI Engineer in our Startups team, you will serve as a vital technical advisor to leading AI-native startups, guiding them in leveraging the Claude Developer Platform as they transition from early-stage products to scalable solutions. You'll engage in deep technical collaborations, working directly with startup engineering teams to assist them in product development, agent design, and pioneering advancements in AI.In close partnership with Applied AI Architects, Account Executives, and Anthropic's Product and Engineering teams, you’ll navigate startups through intricate technical engagements. Utilizing your expertise in AI engineering, you will create custom evaluation frameworks, design scalable architectures, and produce the technical resources necessary for startups to thrive with Claude.

About Our TeamThe Applied Foundations team at OpenAI is committed to ensuring that our state-of-the-art technology remains both innovative and resilient against various adversarial challenges. Our mission is to uphold the integrity of our platforms as they evolve and expand. As a vital part of this team, you will be at the forefront of safeguarding against financial exploitation, large-scale attacks, and other forms of misuse that could jeopardize the user experience and operational stability.The Integrity division within Applied Foundations is tasked with developing scalable systems that identify and respond to harmful activities on OpenAI's platforms. We are establishing a pioneering team in London to design next-generation systems that will enhance and scale the capabilities of experts addressing harms associated with our technology.Key ResponsibilitiesDesign and implement scalable foundational systems for the detection, tracking, and enforcement of harmful activities using our technologies.Collaborate closely with both technical and non-technical specialists to gain insights into the harms we observe stemming from our platforms, guiding your design and implementation processes.Utilize OpenAI’s cutting-edge technologies to automate and enhance our ability to swiftly and accurately detect and analyze complex harms with minimal human intervention.Work alongside policy, trust and safety operations, legal teams, and engineers specializing in harm mitigation to comprehensively address abusive behaviors leveraging OpenAI’s technology.Stay updated on the latest techniques and tools to remain ahead of resourceful adversaries.Ideal Candidate ProfileMinimum of 5 years of software engineering experience focusing on backend and data systems.At least 2 years of experience in trust and safety analysis, investigations, and/or operational roles.Passionate about learning from leading experts on AI-related harms and eager to collaborate within an interdisciplinary team comprising both technical and non-technical roles.Ability to navigate our codebase intuitively, providing insights that strengthen our engineering capabilities.A relentless desire to learn and acquire new skills, coupled with the ability to effectively communicate this knowledge to others.

Join our team at physicsx as a Senior AI Engineer - Applied and be at the forefront of artificial intelligence innovation. This role involves leveraging cutting-edge technologies to develop AI solutions that address real-world challenges. You will collaborate with a talented team of engineers and researchers, contributing to projects that push the boundaries of AI applications.

Join Our Team as a Senior/Staff Fullstack Software Engineer!Location: Fitzrovia, London (Hybrid – 4 days in-office, 1 day remote)About Wizeline:Wizeline is a pioneering global technology solutions provider that harnesses the power of AI to craft innovative digital products and platforms. Our partnerships with clients enable us to leverage data and AI to expedite market entry and catalyze business transformation. Within our vibrant community of innovators, we cultivate a culture that prioritizes growth, collaboration, and impact.At Wizeline, we believe that with the right people and ideas, there are no limits to our achievements.Are You the Right Fit?If you are excited about technology and innovation, we want to hear from you! We are seeking a Senior or Staff Fullstack Software Engineer to contribute to pivotal projects for our esteemed client in London. In this role, you will be responsible for developing scalable, high-performance services that power the next-generation financial platform, which includes applications for deal execution, invoicing, payment distribution, and financial reporting. You will play an essential role in architecting backend systems, integrating with external platforms, and delivering features that streamline complex revenue and transaction workflows throughout the organization.This position operates under a hybrid work model based in Fitzrovia (London), requiring four (4) days in-office and one (1) day remote.Key Responsibilities:Design and implement services to support revenue workflows, payment logic, and invoicing pipelines.Develop robust APIs and full-stack features, utilizing type-safe ORM tooling for schema management and query composition.Manage integration with internal systems (e.g., Salesforce, NetSuite) and external providers (e.g., banks, payment processors).Implement structured financial logic including contingent payments, commission calculations, and milestone-based billing.Incorporate AI/LLM capabilities using Claude (Anthropic) and utilize Cursor as a core development tool to enhance delivery speed.Build and deploy infrastructure in AWS.Translate complex business rules into deterministic backend logic including commissions, milestones, payee splits, and contingent payments.Implement robust data flows between Client Processing, Deal Management, and Authoritative Data domains.

Join Anthropic as the Manager of Forward Deployed Engineering in our Applied AI division. In this pivotal role, you will lead a team of skilled engineers who are at the forefront of deploying innovative AI solutions. Your leadership will be crucial in driving technical excellence and fostering collaboration between cross-functional teams. You will work closely with product management and research teams to ensure our AI systems are effectively integrated into real-world applications.

About the RoleWe are seeking a talented Senior Full-Stack Engineer to become a vital part of our ongoing trading platform development for a major enterprise client. This system is critical to production, long-lasting, and continuously evolving, with a significant emphasis on performance, reliability, and maintainability.While Applied Blockchain is recognized for its advancements in distributed ledger technology and cryptography, this position focuses on a non-blockchain trading system utilizing cutting-edge TypeScript-based technologies.You will join a highly skilled team of senior engineers and QA developers, where autonomy, technical ownership, and thoughtful decision-making are paramount.Your Responsibilities IncludeDesigning, developing, and maintaining features across the full stack of an internal trading platform.Working primarily with:TypeScript (Node.js & React)Monorepo tooling, GitHub, GitHub ActionsJest, PlaywrightRedis, MS SQL, WebSocketsDocker, KubernetesObservability tools (Grafana, Prometheus, SonarQube)Taking complete ownership of features from conception through to production.Collaborating closely with platform/DevOps engineers on build pipelines, observability, and operational concerns.Interfacing directly with clients to clarify requirements and propose effective solutions.Contributing to and enhancing automated testing practices.Participating in peer code reviews to maintain high engineering standards within the team.Utilizing LLM/AI enabled development tools and techniques (with access to the latest OpenAI/Anthropic models) in everyday development.Qualifications8+ years of professional software development experience.3+ years of hands-on experience with TypeScript, including Node.js and React.Proven experience in building and maintaining production systems.Able to work effectively within a senior, autonomous engineering team.Excellent communication skills with fluency in English.Hybrid work arrangement (London).Preferred QualificationsFamiliarity with functional programming concepts or languages (e.g., OCaml, Haskell).Prior experience in trading, finance, or real-time systems.Strong understanding of DevOps and operational aspects (logging, metrics, automation).London-based candidates preferred.Willingness to participate in company/client events and travel as necessary.Benefits5 dedicated training days per year.£1,000 annual training allowance (up to 50% for home workstation equipment).Company-provided equipment and onboarding kit.In-person team events every quarter.Annual bonus based on company performance.

Join Our Team at CapiCapi is revolutionizing the way businesses in emerging markets manage their international supplier payments—making it simple, swift, and equitable.With over $18M in support from leading investors including Creandum, Y Combinator, General Catalyst, and influential figures from Revolut, Checkout, Stripe, and Remitly, we are dedicated to establishing the robust financial infrastructure that emerging markets truly deserve.Our commitment to facilitating global trade empowers local enterprises to accelerate growth, create job opportunities, and enhance prosperity in their communities.Our mission is to uplift GDP in emerging markets by fostering a more equitable and accessible global financial system. We aim to streamline the payment processes for importers, enabling businesses to expand swiftly and act as catalysts for national prosperity.Our dynamic team of approximately 80 individuals, spread across 10 countries, embodies ambition and a results-driven mindset, striving to make a meaningful impact in the world. We are eager to welcome new talent to our team!Explore Capi's mission & values.Role OverviewAs a Senior Fullstack Engineer, you will be part of a compact, high-performing team of engineers and product leaders responsible for scaling our platform and amplifying our impact.From day one, you will collaborate closely with our founding team based in London and Paris, influencing the product vision and shaping the technical architecture of our solutions. This role is pivotal in developing technology that addresses customer challenges as we grow our offerings and enhance our footprint in emerging markets.Empathy and curiosity are essential to uncovering the root causes of problems, along with the creativity to devise solutions that harmonize impact, effort, and user satisfaction.Key ResponsibilitiesEngage in the product lifecycle from conception through to UI design, backend logic, deployment, feedback gathering, and performance measurement.Communicate effectively both internally and externally regarding new features, gathering feedback prior to implementation and articulating them upon launch.Determine and oversee delivery milestones, ensuring alignment between engineering and product priorities.

Role Overview Legal & General is looking for a Senior Fullstack Software Engineer to help shape the future of our retirement services. This role focuses on designing and building software that supports and improves our products for customers in retirement. What You Will Do Develop and maintain software solutions across the stack to support retirement services Work closely with teams from different disciplines to deliver new features and improvements Contribute to technical decisions that raise the bar for quality and performance Focus on delivering reliable, maintainable code that enhances user experience Location This position is based in London.