Senior Frontend Engineer - Growth Experimentation

Join Mixcloud as a Senior Growth Engineer and be instrumental in driving our growth strategy through innovative engineering solutions. You will collaborate with cross-functional teams to design and implement scalable growth initiatives that enhance user acquisition and retention.

Join Our Visionary Team to Create the Premier Training Platform for RunnersAt Runna, we empower everyday runners to achieve their best by developing an exceptional app that offers top-tier training, coaching, and community support. Whether you're aiming to enhance your 5k performance or prepare for your inaugural marathon, we're here to guide you every step of the way.Our growth trajectory is remarkable! In November 2023, we successfully 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 recognized by Apple as one of three global finalists for the iPhone App of the Year, showcasing the innovation and impact of our platform. The journey continued with our acquisition by Strava in 2025!Our aspirations are ambitious: we aim to be the leading global training platform for millions of runners worldwide. As we evolve with purpose, we seek passionate individuals who want to contribute to something meaningful and impactful. With Strava's recent acquisition propelling our mission forward, this is an extraordinary time to become a part of our journey. The Growth Team You’ll Be JoiningWe are on the lookout for a skilled, inquisitive, and experimentation-driven Senior Full Stack Engineer to join our Growth Engineering team. This team is responsible for critical aspects of the user journey at Runna, focusing on both web and app platforms to craft high-quality experiences that convert first-time visitors into dedicated subscribers. You will collaborate closely with product, design, and data teams, as well as our founders and CTO, to enhance how new users discover and engage with Runna.Your ResponsibilitiesDesign, develop, test, and deploy high-impact user journeys and subscription funnels aimed at transforming curious visitors into active, engaged subscribers.Create and execute experiments across both web and app (including onboarding processes, paywalls, and plan discovery experiences) to optimize conversion at every stage of the user journey.Work collaboratively with Product, Design, and Data teams to identify opportunities, establish clear success metrics, and make informed decisions based on experimental outcomes.Partner with other teams to ensure users enjoy a seamless and consistent experience as they navigate through various products and platforms.Implement and sustain the instrumentation, tracking, and tools necessary for understanding user behavior, quickly identifying issues, and accurately measuring impact.Take ownership of features and initiatives that drive user engagement and retention.

About DataCamp DataCamp is at the forefront of empowering individuals and organizations through data and AI transformation. With over 17 million learners and 6,000+ organizations engaged in daily learning, we lead the way in addressing the skills gap in data and AI. Our tailored programs equip teams and individuals to excel in the digital age, whether it's enhancing enterprise-wide data literacy, honing core data skills, embracing generative AI, migrating data warehouses, or simplifying cloud transitions. About You We are looking for passionate individuals who embody our core values: data-driven decision-making, action, transparency, ownership, and a strong customer focus. You thrive in a dynamic and high-performing environment and are motivated to create a significant impact. Your adaptability and enthusiasm for embracing change enable you to push boundaries and take ownership of initiatives. As a collaborative team player, you value transparency and continuously seek opportunities for improvement and innovation. If this resonates with you, we invite you to apply! Responsibilities: Increase the number of new registered users and subscribers by identifying and scaling the most effective levers across the acquisition funnel. Develop and enhance acquisition channels or significantly improve existing ones. Take full ownership of growth initiatives from start to finish: problem framing, business case development, execution, and optimization. You will be responsible for driving results without any hand-offs. Address commercially significant challenges within the business, including monetization model experiments, campaign cadence, and new channel launches. Conduct scenario planning, ROI modeling, and portfolio assessments to facilitate informed decision-making. Lead cross-functional collaboration with product, engineering, data, and marketing teams through clear communication and credibility, rather than authority. Qualifications: We are seeking exceptionally adaptable generalists who can delve deep into various areas when necessary—analytics, channel execution, creative problem-solving, and project delivery. You would describe yourself as a barrel. Ideally, you have 2 to 4 years of experience at a top consulting firm (McKinsey, Bain, or BCG). Prior experience in a startup or scale-up environment is highly preferred.

THE BASICSThis position offers a competitive salary of up to £170,000 per year based on experience, along with equity options.Reporting to: Head of Growth EngineeringLocation: Chancery Lane, London — Monday to Thursday in-office, Friday remote work.WHAT ARE WE BUILDING?Fyxer is revolutionizing the way professionals manage their time with our AI-powered Email & Meeting Assistant. Designed specifically for client-facing roles such as sales, consulting, and recruiting, our platform understands your communication style, drafts replies in your voice, and takes accurate meeting notes.As a dedicated applied AI company, we leverage fine-tuned open-source models and retrieval-augmented generation to deliver a powerful user experience. Impressively, 53% of email drafts generated by our system are utilized by users.Since our launch in March 2024, we have achieved remarkable growth, reaching over $30 million in annual recurring revenue (ARR) and securing $10 million in Series A and $30 million in Series B funding within just 18 months. Our investors include industry leaders such as Marc Benioff (Salesforce), Harry Stebbings (20VC), David Singleton (ex-CTO of Stripe), and Madrona, the first investors in Amazon and Snowflake.THE ROLEWe are seeking a Lead Growth Engineer to join our Growth Engineering team — a tight-knit group that takes full ownership of product-led growth strategies that propel Fyxer's rapid revenue growth.This role is not about UI enhancements; you will be responsible for the infrastructure and strategic direction that guides user growth from initial session to conversion. Your tasks will include designing and executing A/B tests, analyzing user behavior data, and refining the entire user acquisition process through our paid landing pages, programmatic SEO, and lead magnet micro-apps. You will work at the confluence of data, marketing, product, and engineering, utilizing rigorous A/B testing, behavioral analytics, and a comprehensive understanding of B2B SaaS growth mechanics to enhance critical metrics.Each Growth Engineer has complete ownership over a specific area of the product, without the interference of project managers. You will be responsible for both strategic planning and execution.WHAT YOU’LL OWNLead the conversion rate optimization program throughout the entire user journey, from landing page engagement to paid activation and user expansion.Design, implement, and oversee multivariate experiments to systematically enhance conversion rates and identify data-driven improvements for long-term user retention.Manage the experimentation infrastructure, including testing frameworks and statistical rigor, ensuring effective implementation.

Join the Lovable Revolution:Are you a passionate full-stack engineer dedicated to driving growth? At Lovable, we’re on a mission to transform initial interactions into daily habits and foster a vibrant ecosystem that generates real revenue. You'll find yourself launching onboarding and activation flows one sprint, and the next, you'll be innovating distribution channels and monetization features, empowering creators to expand their user base and enhance retention. Your expertise in React and APIs is crucial, but above all, you prioritize user success and engagement.The Ideal Candidate:You possess a unique blend of coding prowess, strong aesthetic judgement, growth-focused instincts, and an unwavering passion for product development.Why Join Lovable?Lovable empowers individuals and teams, from freelancers to Fortune 100 companies, to create software in any programming language. Our platform has already attracted over 2 million users across more than 200 countries, helping them bring ideas to life quickly and efficiently. As part of our small yet talented team in Stockholm, you'll play a pivotal role in redefining the software development landscape. We value ownership, speed, and collaborative spirit, and we seek individuals who are driven, fast-paced, and eager to make a significant impact.

Are you a driven and ambitious professional eager to contribute to revolutionary projects? Join a dynamic team at a rapidly expanding startup, collaborate with industry pioneers, and significantly impact the AI-for-legal sector. Seize the opportunity to own a role in a startup that is creating solutions that people truly desire and has already gained substantial traction. This is your chance to be part of something extraordinary! About the RoleWe are seeking an intelligent and proactive individual with a software engineering background leaning towards frontend development to spearhead our product growth initiatives. You will work at the intersection of engineering, product development, and marketing, analyzing a comprehensive range of metrics such as product usage, engagement, user acquisition, and pipeline optimization.Your responsibilities will include:Product Usage Analysis: Leverage dashboards (Posthog, Grafana, Datadog, etc.) to analyze user behavior and patterns to inform our growth marketing strategies and enhance engagement with existing customers.Top-of-Funnel Optimization: Innovate and execute creative strategies to build our top-of-funnel pipeline, including embedding product features in SEO blog posts and tracking the performance of our paid advertising efforts.Usage Optimization: Create workflows to identify unengaged users and test strategies to boost engagement.Metric Strategy: Collaborate with us to define the key metrics for optimization.Revenue & Pipeline Optimization: Aid in streamlining each step of our sales pipeline, both pre- and post-sale. Who You’ll Work WithSanj (Chief Research Officer and Co-Founder): With a Master's in Physics from the University of Cambridge and a PhD in AI from UCL, Sanj has received accolades at leading AI conferences, worked with Huawei's R&D team, and gained recognition for his contributions to open-source LLM projects on GitHub. As employee #4 at Magic Carpet AI, he developed AI strategies for trading that utilized millions in capital before the company was acquired by Blockchain.com.

Join a dynamic team creating the leading training platform for runners!At Runna, we're dedicated to transforming everyday runners into elite athletes through our state-of-the-art app that offers world-class training, coaching, and a vibrant community. Whether you're aiming to improve your 5k time or gearing up for your first marathon, we are here to help you succeed.Our growth has been remarkable! In November 2023, we secured a $6.5M funding round led by JamJar, complemented by investments from Eka Ventures, Venrex, and Creator Ventures. In 2024, we proudly earned recognition as one of Apple’s three global finalists for the iPhone App of the Year, showcasing our innovative spirit and significant impact. The acquisition by Strava in 2025 has accelerated our mission even further!Our vision is ambitious: to establish ourselves as the premier global training platform for millions of runners worldwide. We are purposeful in our growth and are searching for individuals who aspire to create something meaningful and impactful. With the recent Strava acquisition enhancing our trajectory, there has never been a better time to join us. Your Future TeamWe are on the lookout for a full stack engineer to join our Growth team, primarily focusing on marketing technology. This role places you at the crossroads of product development, data analysis, and marketing efforts – building and supporting the systems that drive our user acquisition, activation, and retention across multiple channels.While Marketing Technology is a key aspect of this position, you'll also engage significantly in full-stack initiatives within our Growth Product Squad – developing new features, launching experiments, and refining them based on user feedback.You will collaborate within our cross-functional Growth squad, closely engaging with product, marketing, and data teams. Key responsibilities include:Enhancing the ways new users discover, trial, and subscribe to Runna.Executing experiments throughout the user journey, from ad engagement to in-app activation and continued user engagement.Managing the essential tools and integrations that underpin our marketing and lifecycle communications.Our Work CultureWe foster cross-functional, collaborative teams united by shared objectives.Our approach emphasizes iterative development, continuous deployment, and a strong commitment to testing and observability.Expect high autonomy and ownership – you will have meaningful responsibility for growth outcomes and the systems that enable them.

At Real Chemistry, we are dedicated to positively transforming healthcare every day. Our passion for making the world healthier is fueled by our deep scientific knowledge, innovative human-centered creativity, and advanced AI-driven insights. We cultivate a unique environment where innovation flourishes and our teams are focused on making an impact. As a global agency, we offer a comprehensive range of services in healthcare communications and marketing, catering to leading organizations in the pharmaceutical and biotech sectors.Our culture, celebrated as #LifeatRealChem, is centered around our people. We believe in the power of collaboration and are committed to delivering excellence for our clients and colleagues alike. If you’re a seasoned expert or just beginning your career, and if you share our enthusiasm for healthcare and meaningful connections, we encourage you to discover the opportunities we offer.Find your purpose. Embrace innovation. Experience #LifeatRealChem.Real Chemistry is on the lookout for a Senior Director of Growth to enhance our expanding UK-based new business team!This is a hybrid position, with a preference for our London office.We seek a strategic, collaborative, and proactive growth leader to drive impactful new business proposals and significant organic growth opportunities across our healthcare portfolio. Reporting to the Head of Strategy and Transformation, you will steer the pitch process, ensuring our responses are integrated, compelling, and align with our agency’s strengths.In this role, you'll craft how we present ourselves to potential clients by transforming client briefs into clear, distinct narratives that showcase our creativity, insights, and understanding of the healthcare landscape.

We are thrilled to announce that we have secured $60 million in Series B funding at a valuation of $685 million - discover more about this exciting news here! Please be aware: This position is based in London and will follow New York business hours for the first six months due to the project's timeline, after which it will revert to UK hours.About LawhiveAt Lawhive, we are on a mission to democratize legal services.The legal sector has long been hindered by outdated technology and processes, which is why we have reimagined the entire framework with our proprietary AI-driven operating system at its core.As a regulated law firm, Lawhive harnesses an AI-native platform designed to enhance legal expertise and transform the practice of law, resulting in extraordinary outcomes for our clients and legal professionals.Lawhive Labs is where this vision takes shape, blending top-tier engineering, design, AI, and legal talent from around the globe to forge the future of legal practice.We are proud to be backed by esteemed investors such as Google Ventures, Balderton Capital, and TQ Ventures, and in early 2026, we successfully completed our $60 million Series B funding round to support our international expansion and team growth.Headquartered in London, we proudly launched in the US in 2025…and this is just the beginning.Engineering at LawhiveOur engineering team comprises 40 talented engineers and researchers who architect, build, and maintain Lawhive’s platform, which is utilized daily by hundreds of legal professionals across the UK, US, and beyond.There are numerous challenges we aim to tackle, and many we have yet to discover! Over the next year, our focus will be on:Enhancing the user experience for AI interactions among lawyers. We are striving for more than just basic “chat” capabilities, seeking to establish a new paradigm for human/machine interaction.Incorporating modularity and country independence into the core of our platform. Following our recent expansion to the US, we are creating the world’s first global consumer law firm.Delivering full-stack AI-native legal services: we’re not just developing software; we’re an AI-powered legal service provider.

Join zeneducate as a Senior Growth Marketing Manager and drive our marketing strategies to enhance growth and engagement. In this role, you will lead innovative marketing campaigns, leveraging analytics and market insights to boost our reach and effectiveness. Collaborate with cross-functional teams to create impactful marketing initiatives, optimize customer journeys, and strengthen brand presence in the education sector.

Crypto.com seeks a Senior Growth Manager - Paid Search to join its London team. This position focuses on driving user acquisition and growth through paid search and app marketing, supporting global operations across cryptocurrency trading, stocks, sports, and prediction markets. Key responsibilities Build, manage, and optimize paid search campaigns across international markets, with emphasis on Google Ads and Apple Search Ads. Develop and implement search strategies to increase acquisition and engagement for multiple product lines. Identify and test new growth opportunities, using data-driven experimentation to improve campaign performance. Oversee a diverse portfolio of search accounts, adapting to new technologies and changing market trends. Requirements Extensive experience in paid search and app marketing, particularly with Google Ads and Apple Search Ads. Demonstrated ability to manage complex, large-scale search accounts. Comfort working in a global, multi-product setting, with attention to compliance, security, and user privacy. Strong curiosity and motivation to stay updated on technology and digital marketing best practices. What Crypto.com offers Access to advanced technology and marketing tools. Collaboration with experienced internal teams and external partners. Ongoing opportunities for product development and personal growth. The ability to make a meaningful impact at a recognized leader in the cryptocurrency sector. Location: London, United Kingdom

At Pipedrive, we recognize that exceptional talent is essential for creating an outstanding product. Our team embodies our core values, and we prioritize hiring individuals who align with them. Since our establishment in 2010, we have been dedicated to empowering sales and marketing teams with user-friendly, powerful tools that streamline daily operations. Today, our cloud-based software is relied upon by over 100,000 companies across 179 countries. We have grown from a small team of five to an expansive international workforce of over 850 individuals, representing more than 50 nationalities, with offices in various locations throughout Europe and the US. In 2020, we proudly received a majority investment from Vista Equity Partners, a leading global investment firm focused exclusively on enterprise software, data, and technology-enabled businesses, marking Pipedrive as Estonia's fifth unicorn.We are currently seeking a Senior Product Manager in London to enhance the onboarding experience for our users. In this fast-paced, experimentation-driven environment, you will utilize both qualitative research and quantitative data to formulate robust hypotheses and scale meaningful user experiences. This role provides a unique opportunity to manage a diverse array of experiments while mentoring fellow Product Managers, aligning strategies with executive leadership, and exploring the integration of AI-powered tools to elevate user experiences and accelerate product innovation.

Join Airwallex as a Senior Account ExecutiveAre you ready to be part of the only unified payments and financial platform designed for global businesses? At Airwallex, we empower over 200,000 companies worldwide—including renowned names like Brex, Rippling, and Qantas—with fully integrated solutions for managing business accounts, payments, spending, treasury, and embedded finance on a global scale.Founded in Melbourne and now boasting a workforce of over 2,000 innovative tech professionals spread across 26 offices, we are valued at US$8 billion and backed by industry-leading investors such as T. Rowe Price, Visa, and Sequoia. If you're looking to embark on the most ambitious chapter of your career, we want you to join our team.What We ValueWe seek dynamic builders who possess a founder-like energy and desire to make a real impact. If you are an expert in your field, motivated by our mission and operating principles, and are capable of making swift and sound decisions, we want to hear from you. Collaboration, humility, and a passion for transforming ideas into tangible products are essential. If you thrive in tackling complex challenges alongside exceptional teammates, let’s shape the future of global banking together.We are currently on the lookout for a mid-senior to senior level Account Executive to enhance our SME & Growth team.Your primary mission will be to attract and onboard new SME clients. You will leverage your expertise in pitching, negotiation, and driving internal processes to ensure successful partnerships. A passion for building relationships and a commitment to revolutionizing global transactions will be key to your success.

Join Bumble Inc. as the Senior Director of Marketing Measurement & Growth for a 12-month fixed-term contract. In this pivotal role, you will lead a team focused on advanced marketing analytics, driving strategic growth initiatives, and optimizing marketing performance. Your expertise will be crucial in shaping our marketing strategies to achieve measurable results.

About AirwallexAirwallex is a pioneering unified payments and financial platform designed for global enterprises. With our exceptional blend of proprietary infrastructure and innovative software, we serve over 200,000 businesses globally, including industry leaders like Brex, Rippling, Navan, Qantas, and SHEIN. Our fully integrated solutions facilitate everything from business accounts and payments to spend management and treasury, as well as embedded finance on a global scale.Founded in Melbourne, we boast a diverse team of over 2,000 talented tech professionals across 26 offices worldwide. Valued at $8 billion and supported by top-tier investors such as T. Rowe Price, Visa, Mastercard, Robinhood Ventures, Sequoia, Salesforce Ventures, DST Global, and Lone Pine Capital, Airwallex is at the forefront of constructing the future global payments and financial platform. If you're eager to undertake the most ambitious work of your career, we invite you to join our team.

Join Spotify as a Senior Product Manager specializing in Machine Learning and Subscriptions Growth. In this pivotal role, you will drive innovative product strategies and enhancements that optimize user experiences and increase subscription rates. Collaborate with cross-functional teams to leverage data-driven insights, ensuring our product offerings align with market trends and user expectations.Your leadership will guide product development from conception through execution, fostering a culture of innovation and excellence. If you're passionate about music, technology, and shaping the future of our platform, we want to hear from you!

About FreshaFresha is the premier marketplace platform for beauty and wellness, trusted by millions of consumers and businesses globally. With over 130,000 businesses and 450,000 stylists leveraging the platform, Fresha has successfully processed over 1 billion appointments to date.Headquartered in London, United Kingdom, Fresha boasts 15 global offices across North America, EMEA, and APAC.Our platform empowers consumers to discover, book, and pay for beauty and wellness services from local businesses. Meanwhile, beauty and wellness professionals utilize our comprehensive platform to streamline their operations through intuitive software and innovative financial technology solutions.Fresha’s ecosystem equips merchants with essential tools for seamless business operations, including appointment scheduling, point-of-sale systems, customer relationship management, marketing automation, loyalty programs, inventory management for beauty products, and team oversight.By tapping into the consumer marketplace, partner businesses can enhance their revenue potential through online bookings and automated marketing, leveraging integrations with major tech platforms like Instagram, Facebook, and Google.Role Overview:In light of our ambitious growth strategy, we are seeking an exceptional Senior Product Manager to join our dynamic global team.Reporting directly to the Head of Product, you will collaborate closely with engineers, designers, data analysts, and marketers to bring a compelling product vision to fruition. Your role will involve researching, developing, and delivering a world-class user experience for our customers and partners in an innovative environment.You will play a pivotal role in influencing and shaping how our partners grow their businesses within the Fresha marketplace and manage their daily operations effectively.This position is ideal for someone who thrives in a fast-paced, evolving environment, enjoys working autonomously, embraces challenges, and seeks to make a significant impact.

About NextStep NextStep connects consulting professionals with opportunities using AI-driven matching. We work with a range of companies to place skilled talent where they can have an impact. This Growth Strategy Manager position sits within our partner network for a client in London. About the Client Our client is a Series B online marketplace headquartered in London. Their platform connects independent professionals with project-based roles in creative, tech, and marketing fields. With more than 500,000 registered professionals and a growing customer base, they are building out a Growth Strategy function to drive user acquisition, improve conversion, and strengthen customer economics. The company is backed by top European and US venture capital firms and is preparing for a Series C round. Role Overview The Growth Strategy Manager shapes the analytical and strategic direction of the company’s growth efforts. This role builds frameworks and models to inform decisions on acquisition, retention, and monetization. Working alongside the Head of Growth, Product, and Marketing, the manager runs experiments, analyzes data, and helps identify the most promising growth opportunities. Key Responsibilities Build and update growth models linking acquisition spend, conversion rates, and customer lifetime value to business outcomes. Design and assess A/B tests and growth experiments across acquisition, activation, and retention channels. Oversee the growth analytics stack, including funnel reporting, cohort analysis, and channel attribution. Work with Marketing and Product teams to spot and prioritize high-impact growth initiatives. Deliver regular growth performance reviews to senior leadership, providing clear recommendations for strategic change. Requirements 4–7 years in growth strategy, growth analytics, or a data-focused commercial role within a marketplace or digital product setting. Strong quantitative skills; comfortable with SQL, Python, or similar tools, and experienced in building growth and financial models. Strategic mindset with the ability to turn analysis into actionable commercial insights. Collaborative approach, able to work closely with product, marketing, and finance teams.

Growth ManagerLondonAbout Aarki:Aarki is a pioneering AI-centric company that specializes in mobile advertising solutions tailored to drive revenue growth. Our innovative approach harnesses AI to uncover targeted audiences in a privacy-conscious environment, utilizing trillions of contextual bidding signals and our proprietary behavioral models. Our comprehensive audience engagement platform blends creative strategy with flawless execution, managing an impressive 5 million mobile ad requests every second across over 10 billion devices, enhancing performance for both publishers and brands. With headquarters in San Francisco, CA, we boast a robust global presence spanning the United States, EMEA, and APAC.The Role:As a Growth Manager, you will spearhead revenue retention and growth by pinpointing and executing high-impact opportunities throughout your designated business portfolio. This role involves crafting growth plans and ensuring effective communication of progress through operational excellence, including forecasting and pipeline management. You will leverage data-driven insights to establish consultative, strategic partnerships within client organizations, prioritize key initiatives, and measure impactful outcomes through Quarterly Business Reviews (QBRs) and ongoing performance assessments. Internally, you will foster strong cross-functional relationships to align teams, eliminate obstacles, and guarantee the precise execution of growth strategies.Your Responsibilities:Revenue Retention & GrowthDrive net growth across your business portfolio, aiming to meet or exceed revenue targets.Identify and capitalize on growth opportunities while managing associated risks.Promote product adoption and implement churn prevention and reactivation strategies.Contribute to the long-term revenue pipeline by recognizing customer needs and identifying business gaps.Client Ownership & StrategyOwn strategic account management, fostering relationships that prioritize client success.