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Senior Software Engineer II (Fullstack) - Server Driven UI

Wise

Full-time|On-site|London

Role Overview Wise is looking for a Senior Software Engineer II with fullstack experience and a focus on Server Driven UI. This role centers on building and maintaining software that supports smooth user experiences across different platforms. What You Will Do Design and implement software systems for Server Driven UI Work closely with teammates to develop s…

Apr 17, 2026

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Senior Fullstack Software Engineer

Legal & General

Full-time|On-site|London

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.

Apr 15, 2026

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Senior/Staff Fullstack Software Engineer

Wizeline

Full-time|Hybrid|London

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.

Mar 20, 2026

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Senior Software Engineer - UI, Connectors Platform

Algolia

Full-time|On-site|London, England

Join Algolia as a Senior Software Engineer specializing in User Interface and Connectors Platform. In this pivotal role, you will contribute to the development of innovative UI solutions that enhance user experience across our platform. Collaborate with a talented team of engineers to design, implement, and optimize various connectors, ensuring seamless integration with our services.We are looking for a candidate who is passionate about technology, thrives in a fast-paced environment, and is eager to push the boundaries of what is possible in software engineering.

Apr 9, 2026

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Senior Software Engineer - Client SDK (UI Platform)

Postman

Full-time|On-site|London, UK

Who Are We?Postman is the premier API platform, utilized by over 45 million developers and 500,000 organizations, including 98% of the Fortune 500. We empower developers and professionals worldwide to create an API-first ecosystem by simplifying each phase of the API lifecycle and enhancing collaboration, allowing users to build better APIs, faster.Headquartered in San Francisco, we maintain offices in Boston, New York, Austin, Tokyo, London, and Bangalore—where Postman originated. As a privately held company, we are backed by esteemed investors including Battery Ventures, BOND, Coatue, CRV, Insight Partners, and Nexus Venture Partners. Discover more at postman.com or connect with us on X via @getpostman.P.S: We recommend exploring The "API-First World" graphic novel to grasp our broader vision at Postman.The OpportunityThe Client Platform team is on the lookout for a Senior Frontend Engineer to elevate our UI Platform standards and enhance our frontend ecosystem. You will champion engineering excellence through refined architecture, performance enhancements, and sustainable coding practices, ensuring our platform provides outstanding experiences.Collaborating with fellow senior engineers, you will oversee various components of our UI Platform (including design systems, accessibility, internationalization, theming, etc.). This represents a unique chance to make a significant impact on the foundation that hundreds of Postman engineers and our 40+ million customers rely on daily.What You’ll DoThe Client Platform team is a global engineering unit responsible for establishing a streamlined environment for all Postmanauts to develop and deploy web applications. Our platform serves as the backbone for over 240 engineers at Postman who depend on it to launch new features and enhancements to more than 40 million users.Design and implement scalable, maintainable front-end solutions, focusing on the presentation layerDesign system and component libraryApplication shell & layoutSpecialized UI components (code editor, text editor, data grid)Global UI patternsAccessibilityInternationalization/localizationTheming/styling architecture

Feb 4, 2026

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Senior/Staff Fullstack Software Engineer

Wizeline

Full-time|Hybrid|London

Join Our Team as a Senior/Staff Fullstack Software Engineer!Location: Fitzrovia, London (Hybrid – 4 days in office, 1 day remote)About Us:Wizeline is a forward-thinking, AI-native technology solutions provider dedicated to crafting innovative digital products and platforms. Our mission is to help clients harness the power of data and AI, facilitating swift market entry and transformative business solutions. We pride ourselves on being a global community of innovators, nurturing a culture that emphasizes growth, collaboration, and impactful results.With the right talent and visionary ideas, we believe there are no boundaries to what we can accomplish.Are You the Right Fit?We are in search of a Senior or Staff Fullstack Software Engineer to collaborate with one of our key clients in London. In this pivotal role, you will develop scalable, high-performance services that underpin the company's next-generation financial platform. This encompasses applications for deal execution, invoicing, payment distribution, and financial reporting. You will be instrumental in architecting backend systems, integrating with external platforms, and delivering features that support complex revenue and transaction workflows across the organization.This position follows a hybrid work model based in Fitzrovia (London), with four (4) days per week in the office and one (1) day working from home.Key Responsibilities:Design and implement services that facilitate revenue workflows, payment logic, and invoicing pipelines.Create robust APIs and full-stack features, utilizing type-safe ORM tooling for schema management and query composition.Handle 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.Integrate AI/LLM capabilities using Claude (Anthropic) and utilize Cursor as a core development tool to accelerate delivery.Build and deploy infrastructure in AWS.Translate complex business rules into determinable backend logic: commissions, milestones, payee splits, and contingent payments.Establish robust data flows between Client Processing, Deal Management, and Authoritative Data domains.

Mar 25, 2026

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Senior Fullstack Engineer

Elliptic

Full-time|On-site|London, United Kingdom

About the RoleJoin our dynamic Collection Engineering team as a Senior Fullstack Engineer, where you will play a pivotal role in enhancing Elliptic's efforts to combat crypto crime. You will be instrumental in developing a robust platform that empowers our intelligence organization to efficiently gather and analyze critical information, making the world safer.Your team’s mission is to amplify Elliptic’s intelligence collection capabilities by processing data from diverse sources, including external feeds, internal automation, and client submissions. This intel needs to be systematically classified, stored, and reviewed before being integrated into our proprietary graph database.Collaborate with a talented group of engineers and data scientists to create innovative tools, streamline processes, and eliminate obstacles in our intelligence pipelines.Key ResponsibilitiesDesign and implement software solutions that enhance our intelligence collection and analysis capabilities, including services on Kubernetes and browser extensions.Develop applications to analyze cryptocurrency behavior and trends across both the clear and dark web.Establish observability mechanisms to identify issues within your environments and execute necessary business processes for resolution.Mentor and coach fellow engineers to foster growth and implement best practices within the team.Actively contribute to defining and refining the engineering strategy for your team.Ideal Candidate ProfileDemonstrates a strong passion for cryptocurrencies and blockchains from both technical and economic perspectives.Possesses excellent coding skills in Typescript with a proven track record of delivering effective solutions.Has successfully integrated various systems to improve operational efficiency.Enjoys collaborating within a tight-knit team to tackle impactful challenges, contributing to a safer crypto ecosystem.Promotes a collaborative culture characterized by open communication, especially when addressing issues or concerns.Able to construct well-reasoned, data-driven arguments to influence key stakeholders effectively.

Jan 20, 2026

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Senior Fullstack Software Engineer - Privacy & Data Security

Vanta

Full-time|On-site|London, UK

Join Vanta as a Senior Fullstack Software Engineer specializing in Privacy & Data Security. In this role, you'll leverage your extensive experience in software development to enhance our platform's privacy features while ensuring data integrity and security. You will collaborate closely with cross-functional teams to design, develop, and implement robust solutions that protect user data.

Mar 17, 2026

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Senior Fullstack Engineer - Commerce Platform

Spotify

Full-time|On-site|London

Join Spotify as a Senior Fullstack Engineer on our Commerce Platform team, where you'll play a critical role in shaping the future of our commerce solutions. You will collaborate with cross-functional teams to design, develop, and implement robust features that enhance user experience for millions. Your expertise will drive innovation and help us maintain our position as a leader in the music streaming industry.

Mar 16, 2026

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Fullstack Software Engineer - Core

Dataiku

Full-time|Remote|United Kingdom, London; United Kingdom, Remote

Dataiku is at the forefront of AI innovation, providing an enterprise platform that facilitates the effective building, deployment, and governance of AI solutions. Our unified environment empowers teams to design and operate analytics, machine learning, and AI agents while ensuring transparency, collaboration, and control across the organization. With the ability to integrate seamlessly with data platforms, cloud infrastructure, and AI services, Dataiku connects the entire AI ecosystem, enabling organizations to leverage AI across multi-vendor environments with centralized governance.The world’s top companies trust Dataiku to operationalize AI, transforming it into a driving force for business performance and delivering tangible value. To learn more, visit the Dataiku blog, LinkedIn, X, and YouTube.Why Engineering at Dataiku?At Dataiku, we are committed to integrating cutting-edge data science technologies within our on-premise, cloud, or SaaS-deployed platform. Our technology stack showcases our dedication to quality and innovation. By incorporating the finest data and AI technologies, we select tools that genuinely enhance our product offerings. From the latest LLMs to our commitment to open-source communities, you will have the opportunity to work with a diverse range of technologies and contribute to the collective knowledge of global tech innovators. For more insights on engineering at Dataiku, click here.Explore our offerings: Dataiku's Key Capabilities; Dataiku's Github; and our Gallery, which showcases example projects (please note that editing is limited and will be reset regularly).Our flagship product, Dataiku DSS (Data Science Studio), is designed to streamline your data science workflow. To see it in action, check out our demo here.

Feb 20, 2026

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Senior Fullstack Engineer at Causaly | London

Causaly

Full-time|On-site|London

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.

Mar 4, 2026

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Senior Fullstack Engineer - Vendor Risk Management

Vanta

Full-time|On-site|London, UK

Join Vanta as a Senior Fullstack Engineer specializing in Vendor Risk Management, where you will play a pivotal role in enhancing our software solutions. You will collaborate with cross-functional teams to design, develop, and maintain robust applications that help our clients manage vendor risks effectively.Your expertise will contribute to improving our product functionality, ensuring high-quality code, and implementing best practices in software development. We are looking for a passionate engineer who thrives in a dynamic environment and is eager to tackle challenging problems.

Mar 19, 2026

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Fullstack Software Engineer - Business Solutions

Dataiku

Full-time|On-site|United Kingdom, London

Dataiku is the premier platform for AI success, serving as the enterprise orchestration layer for the development, deployment, and governance of AI solutions. Our unified environment enables teams to design and operate analytics, machine learning, and AI agents, ensuring the transparency, collaboration, and control required by enterprises. By integrating data platforms, cloud infrastructure, and AI services, Dataiku connects the entire AI stack across diverse vendor environments, providing centralized governance and empowering organizations to leverage AI as a critical component of their business strategy.Top global companies trust Dataiku to operationalize AI, transforming it into a robust engine for business performance that generates measurable value. For more insights, explore the Dataiku blog, LinkedIn, X, and YouTube.Why Engineering at Dataiku?At Dataiku, we are committed to quality and innovation in our engineering processes. Our platform, available on-premise, in the cloud, or as a SaaS solution, connects a wide array of data science technologies. We pride ourselves on integrating the most effective data and AI tools that enhance our product. Working with cutting-edge technologies, including the latest LLMs and open-source contributions, you will be part of a dynamic team of innovators. Learn more about our engineering culture here.In the Business Solutions department, we are developing applications that harness Dataiku’s capabilities in data and AI. Our focus is on creating user-centered interfaces and workflows for key enterprise use cases across various sectors including Manufacturing, Life Sciences, and Finance, thus integrating AI into daily business operations.How You Will Make an ImpactDevelop Innovative AI-Driven Applications: Design, build, and deploy AI-powered applications that address complex business challenges.

Feb 20, 2026

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Senior Fullstack Engineer

Capi

Full-time|On-site|London

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.

Oct 8, 2025

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Senior Software Engineer II

Runna

Full-time|On-site|Runna London

Join Runna as a Senior Software Engineer II, where you'll play a pivotal role in enhancing our software solutions. You will collaborate with cross-functional teams to design, develop, and implement robust applications that meet our customers' needs. Your expertise will help us push the boundaries of technology, ensuring our products remain at the forefront of the industry.

Apr 9, 2026

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Senior Software Engineer II

Runna

Full-time|On-site|Runna London

Join our talented team to create the leading training platform for runners!At Runna, we empower everyday runners to excel by developing an exceptional app that offers world-class training, coaching, and a vibrant community for everyone—from improving 5k times to training for marathons.Our growth is remarkable! In November 2023, we secured a $6.5M funding round led by JamJar, with contributions from Eka Ventures, Venrex, and Creator Ventures. In 2024, we were honored to be one of three global finalists for the iPhone App of the Year by Apple, showcasing our innovation and impact. By 2025, we became part of Strava, further accelerating our journey!Our vision is ambitious: to be the premier global training platform for millions of runners worldwide. As we grow with intention, we seek individuals eager to contribute to something meaningful that leaves a lasting legacy. With the backing of Strava, now is an exciting time to be a part of our journey. The Team You'll JoinWe are in search of innovative, creative, and positive collaborators to become part of our skilled cross-functional engineering team. You will be part of the Train Team, collaborating closely with our modeling teams to integrate essential features aligned with Runna's mission, such as adapting plans for holidays and B races, supporting cutting-edge training plans, and enhancing in-app experiences using our AI/ML tools.You will partner with our CTO and engineering leadership to help shape the future of Runna, receiving unwavering support throughout this thrilling journey. Our roadmap is packed with opportunities to champion new technologies, tackle significant challenges affecting millions of runners, and enhance our existing architecture to elevate our engineering team.Your ResponsibilitiesDesigning, developing, testing, and delivering innovative features across the full stack.Collaborating with the Product team to determine the best solutions for optimal customer experiences.Working with modeling/AI engineers to design the architecture that interfaces between the Runna training engine and the Runna app.Providing technical support to team members as needed.Mentoring and coaching engineers in your team, offering guidance and code reviews while avoiding bottlenecks.

Apr 13, 2026

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Senior Fullstack Engineer (Applied AI) at Contentsquare | London

Contentsquare

Full-time|Hybrid|London area

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.

Jan 20, 2026

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Fullstack Enterprise Engineer

lovable

Full-time|On-site|London

lovable is looking for a Fullstack Enterprise Engineer in London. This position centers on building and delivering software solutions that meet enterprise standards. Collaboration with teams across disciplines is a key part of the work. Role overview This role involves developing software from both the front-end and back-end, ensuring each component integrates smoothly. The focus is on producing reliable, maintainable code that supports business needs. What you will do Develop and implement software solutions for enterprise use Work with cross-functional teams to deliver projects Apply experience in both front-end and back-end technologies Requirements Experience with front-end and back-end development Ability to collaborate effectively with colleagues from different specialties Commitment to producing high-quality, impactful results

Apr 23, 2026

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Senior Software Engineer II

Runna Ltd.

Full-time|On-site|Runna London

Join Our Team as a Senior Software Engineer IIAt Runna, we are assembling a skilled team dedicated to creating the premier training platform for runners. Our innovative app empowers everyday runners to achieve their best, offering world-class training, coaching, and community support for everyone from 5k enthusiasts to marathon first-timers.We are experiencing rapid growth! In November 2023, we successfully completed a $6.5M funding round led by JamJar, with contributions from Eka Ventures, Venrex, and Creator Ventures. Our app was recognized as one of three global finalists for Apple's iPhone App of the Year in 2024, showcasing the groundbreaking impact of our work. In 2025, we proudly joined the Strava family!Our goal is ambitious: to be the leading training platform for millions of runners worldwide. With our recent acquisition by Strava amplifying our mission, now is an exciting time to become part of something truly meaningful. Your Future TeamWe seek talented, innovative, and collaborative individuals to join our cross-functional engineering team. You will be an integral member of our newly formed Strength Team, collaborating with our modeling engineers and Team Strava to revolutionize strength training for athletes.You will work closely with our CTO and engineering leadership to shape the future of Runna, receiving support throughout this exhilarating journey. With a dynamic roadmap filled with opportunities, you will champion new technologies, solve meaningful challenges for millions of athletes, and enhance our existing architecture to elevate our engineering efforts.Your ResponsibilitiesArchitect, develop, test, and deploy new features across the full technology stack.Collaborate with the Product team to identify optimal solutions for an exceptional user experience.Partner with modeling and AI engineers to design the architecture that connects the Runna training engine with the Runna app.Provide technical assistance and mentorship to team members as needed.Guide and support fellow engineers through mentorship and code reviews, ensuring smooth workflows without bottlenecks.Contribute to operational efficiency by building and maintaining our development infrastructure.

Mar 30, 2026

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Senior Software Engineer II

Axon Enterprise, Inc.

Full-time|On-site|London, England, United Kingdom

Role overview Axon Enterprise, Inc. is seeking a Senior Software Engineer II to join its London office. This position centers on developing software that directly supports public safety and serves communities. Engineers at Axon play a key part in building solutions designed to grow and adapt alongside evolving needs. Key responsibilities Collaborate with engineers from diverse backgrounds to design and build software products Develop and enhance systems that assist public safety professionals in their daily responsibilities Share ideas and contribute code in a setting that values technical input and encourages new perspectives Work environment The engineering group values both initiative and teamwork. Creativity and practical problem-solving are woven into daily routines, and the team moves quickly to deliver results that matter.

Apr 21, 2026

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