Senior Backend Engineer - Engagement & Monetization

Who We AreYubo is a dynamic social discovery platform designed for Gen Z, enabling users to make new friends and connect authentically online. By removing likes and follows, we encourage our community to express their true selves and forge real connections.With millions of active users, we are revolutionizing how young people socialize online. Our mission is…

About BlaBlaCar BlaBlaCar connects 27 million members each year, making it possible to carpool or travel by bus in 21 countries. The team includes 800 people from over 50 nationalities, working from five offices worldwide. Around 30% of employees work remotely. Role Overview: Mid-Level Backend Engineer – Carpool Monetization The Carpool Monetization team builds and improves the models that drive how BlaBlaCar monetizes its core carpool services. As a Backend Engineer in this group, the focus will be on developing, scaling, and optimizing the Monetization core services. This covers the full feature lifecycle: discovery, technical design, implementation, testing, deployment, monitoring, and continuous improvement. The team is cross-functional, including 3 Frontend Engineers, 4 Backend Engineers, a Product Manager, a UX Designer, and an Engineering Manager. Projects touch areas like subscription services, freemium experiences, insurance processes, Energy Saving Certificates, and rolling out monetization in new regions. Technology Stack Java backend services delivered through REST APIs Kubernetes infrastructure managed with Terraform Event-driven architecture using Kafka Datadog for application and infrastructure monitoring There is also the option to contribute to frontend development if interested. Main Responsibilities Develop, maintain, and monitor Monetization core services Support application quality and ongoing improvements; join design discussions and code reviews Location Paris, France

About BeRealAt BeReal, our mission is to champion authenticity in the realm of social media. We empower our community to share unfiltered moments, fostering genuine connections and celebrating the beauty of real life. With a passionate, international team of over 70 members and more than 40 million monthly active users, we are on a mission to scale BeReal into a leading social network used by millions worldwide, backed by the innovative resources of Voodoo.Your RoleWe are in search of a skilled Senior iOS Engineer to join our dynamic Monetization team. In this role, you will be pivotal in developing and enhancing revenue-generating features that align with the authentic user experience that defines BeReal.Key Responsibilities:Design, implement, and maintain scalable iOS monetization features including ad formats, sponsored content, and premium features within an agile and impactful environment.Collaborate with cross-functional teams, including designers, product managers, data analysts, and backend engineers, to create innovative monetization solutions that enhance user experience.Act as a bridge between advertisers and users, ensuring monetization strategies are seamless and unobtrusive.Optimize the performance and stability of monetization features to ensure they integrate smoothly with the core BeReal experience.Analyze user behavior, A/B test results, and business metrics to refine monetization strategies.Deliver a high-quality, authentic user experience through thoughtful technical solutions.Advocate for and contribute to best practices in code quality, design, and development processes.Continuously innovate and enhance our iOS tech stack, specifically with Swift and SwiftUI.You will leverage AI tools to enhance your creativity and streamline your daily tasks.

About BeRealAt BeReal, we are revolutionizing social media by prioritizing authenticity and real-life connections. Our platform encourages users to share genuine, unfiltered moments, fostering a community of over 40 million monthly active users globally. As part of the Voodoo family, our dedicated team of 70+ is on a mission to scale BeReal into a leading social network embraced by millions.Role OverviewWe are seeking a skilled Senior iOS Engineer to be an integral part of our Monetization team. In this role, you will be pivotal in designing and optimizing revenue-generating features while preserving the unique authenticity that BeReal is known for.Your Key Responsibilities:Architecting, developing, and maintaining scalable iOS monetization features including ad formats, sponsored content, and premium functionalities in a dynamic environment.Collaborating with cross-functional teams—designers, product managers, data analysts, and backend engineers—to innovate monetization solutions that enhance user experience.Acting as a liaison between advertisers/partners and our users, ensuring monetization methods feel organic and unobtrusive.Enhancing the performance and reliability of monetization features to ensure they integrate seamlessly with the core BeReal experience.Analyzing user behavior and A/B testing results to refine monetization strategies effectively.Maintaining a high-quality, authentic user experience through thoughtful engineering solutions.Advocating for and implementing best practices in code quality, design patterns, and development processes.Continuously innovating and enhancing the iOS technology stack (Swift, SwiftUI).You will leverage cutting-edge AI tools to enhance your creativity and optimize your workflow.

About UsAt Yubo, we are revolutionizing the way individuals connect online through our innovative Social Discovery app. By removing likes and follows, we empower our users to form authentic relationships and express their true selves.We have pioneered a fresh approach for Generation Z to engage socially in the digital realm, currently serving millions of active users. Our mission is to continuously redefine how social connections are formed now and in the future.Our team is diverse, multicultural, and passionately dedicated to our vision. As a leading platform for online socialization, we prioritize creating a safe digital environment for our community. Safety is ingrained in our values, and we proactively work on user protection, support, and education, collaborating with the tech industry and NGOs to establish best-in-class child protection standards.Join us on this exciting journey and play a vital role in shaping the future of social interactions!Role OverviewAs we expand our Tech organization for 2026, Yubo is launching a new Innovate squad dedicated to daring product initiatives and high-stakes projects.This squad aims to take bold risks, experiment with ambitious features, and validate ideas through ongoing testing.We are seeking a Senior Backend Engineer to become a key member of our Backend Experience team, reporting directly to Armand, our Engineering Manager.You will work within a multi-disciplinary squad (including Product, Mobile, Design, and Data) alongside a Senior Backend Engineer who shares leadership responsibilities.Your mission? Design, implement, and manage high-risk backend experiments that test groundbreaking product ideas while ensuring our systems remain resilient, scalable, and cost-effective throughout rapid iteration cycles.This position is not about maintenance; it's focused on building, testing, rolling back, iterating, and learning swiftly.

About VibeAt Vibe.co, we are revolutionizing the way brands connect with audiences in the streaming era. We envision that streaming TV transcends traditional brand awareness; it is poised to be the next major avenue for performance marketing. Our mission is to create the infrastructure that harnesses this $100 billion potential.As a leader in Audience First Streaming TV Advertising, Vibe.co empowers marketers to leverage TV as an effective growth channel. Our comprehensive solution integrates hyper-targeted audience segmentation, AI-driven insights, real-time campaign optimization, and incrementality measurement, providing brands of all sizes the accuracy and transparency they expect from social and search advertising, applied to the TV landscape.With over 10,000 trusted brands and a reach of more than 120 million households across 500+ apps and channels, Vibe.co consistently delivers an impressive average return on ad spend of 250% and a 20% lift in sales. Achieving a $100 million revenue run rate in less than two years, we are among the fastest software companies to reach this remarkable milestone.Our investors include notable firms such as Hedosophia (early backer of Spotify, Uber, and Airbnb), Elaia, Singular, QuantumLight, and Illusian, alongside angel investors like Carolyn Everson, board member of The Walt Disney Company and Coca-Cola. Nirav Tolia, CEO of Nextdoor, is also a member of our board of directors.Founded in 2022, Vibe.co is recognized as a pioneering platform in streaming TV advertising, merging the power of performance marketing akin to Meta and Google with the fast-evolving media landscape.About the RoleAs a key member of the Performance team, you will play a vital role in managing advertiser outcomes at Vibe. Your focus will be on bidding, pacing, and enhancing the prediction stack that drives these elements. You will report directly to Clément Schiano, Engineering Manager for Performance.This position has been created to address a clear roadmap and enhance execution capabilities, as well as to mitigate knowledge concentration challenges within the team. We seek an individual who can absorb, challenge, and expand upon existing expertise, going beyond simply delivering tickets.Three compelling reasons why a talented candidate would find this role appealing:

Role Overview JobTeaser is hiring a Senior Backend Engineer with strong Ruby experience to join the team in Paris. This role focuses on building and maintaining scalable backend systems that support our platform. What You Will Do Design, develop, and maintain backend solutions using Ruby Work with cross-functional teams to deliver reliable features and improvements Write high-quality code that supports a strong user experience Location This position is based in Paris.

About UpflowUpflow is a pioneering SaaS startup specializing in advanced cash collection technology designed to help B2B companies streamline their payment processes and get paid more efficiently.Founded in 2018, we have quickly gained the trust of hundreds of businesses across the US and EMEA, partnering with notable clients such as Lattice, ProductBoard, and Instawork. Our growth has been fueled by leading investors including YCombinator, eFounders, and prominent business angels from companies like N26, Square, Mercury, Uber, and NetSuite.Join us for an exciting opportunity to work within a rapidly evolving Fintech landscape in a diverse and international setting.To learn more about our team and culture, please visit our careers page at www.upflow.io/careersAbout the RoleAs a Senior Backend Engineer, you will be part of a compact and dynamic team based in Paris or working remotely, dedicated to developing impactful features for our users. Your responsibilities will encompass a variety of areas, including integrations with third-party financial systems like ERPs and billing tools, real-time data synchronization for millions of financial transactions, and managing our REST API. We prioritize data accuracy and reliability at scale, ensuring seamless financial data exchange between systems.We embrace continuous deployment (averaging 10 deployments per day) and foster a culture of pragmatism, ownership, and a growth mindset.For insights into our engineering practices, refer to this article.Your ResponsibilitiesIn your role at Upflow, you will:Design and implement complex, high-impact features from inception to completion.Work closely with the product manager and fellow engineers to convert business needs into technical solutions.Deploy clean, maintainable code to production on a daily basis.Engage in code reviews, offering and receiving constructive feedback.Diagnose and resolve intricate data and product challenges.Optimize application performance and scalability.

About LuoPayLuoPay is a rapidly expanding financial exchange (FX) and cross-border payment platform headquartered in Africa. We empower African businesses to settle payments with their international suppliers more swiftly, transparently, and competitively than conventional methods.Having swiftly established our brand in several markets, we are eager to expand our engineering team and continue enhancing the financial infrastructure for FX and cross-border payments across Africa.Role OverviewAs a Senior Backend Engineer, you will collaborate with a skilled team of engineers to develop a wide array of customer-facing products, internal tools, and financial systems. Your contributions will be pivotal in maintaining and enhancing a payment infrastructure that handles millions of euros in transactions daily.Key ResponsibilitiesDesign and implement production-grade HTTP APIs using Golang.Create API integrations with fintech partners.Influence architectural decisions.Establish CI/CD pipelines.Deploy resources and services on Google Cloud Platform.Implement best practices for Site Reliability Engineering (SRE) and security.Conduct comprehensive testing.Utilize AI-driven development methodologies.What We Are Looking ForA minimum of 6 years of backend development experience.Extensive knowledge of Golang.Proficient in working with SQL databases.Experience in managing infrastructure on Google Cloud Platform or other cloud services.Ability to thrive in a fast-paced team environment.Familiarity with large language model (LLM) driven development.Systems Developed at LuoPayA payment platform tailored for businesses in Africa.Internal tools for payment operators, treasury analysts, and FX traders.AI applications for OCR and invoice approval.KYC onboarding processes.Anti-Money Laundering and Transaction Monitoring systems.Core Banking and Ledger Systems.Automated payouts with banking partners.

Join Dailymotion as a Senior Backend Engineer and play a pivotal role in developing our core components. In this fully remote position, you will work collaboratively with cross-functional teams to design, build, and maintain scalable backend systems that power our video platform.

As an Audience Monetization Manager at BlaBlaCar, you will play a pivotal role in driving our monetization strategy and optimizing revenue streams. You'll collaborate closely with cross-functional teams to enhance user engagement and develop innovative advertising solutions that resonate with our audience.

Join Fabulous Co. as a Senior Backend Engineer specializing in NodeJS and contribute to our rapid growth in the health and wellness sector. In this startup-like environment, you’ll collaborate closely with our experienced CTO to develop cutting-edge features such as marketing optimization engines and billing reports. If you’re passionate about leveraging technology to help people cultivate healthy habits worldwide, we invite you to be part of our dynamic engineering team.

About VoodooEstablished in 2013, Voodoo is a leading technology company dedicated to developing captivating mobile games and applications aimed at entertaining users globally. With a dynamic team of 800 professionals, we proudly boast 7 billion downloads and over 200 million active users, positioning Voodoo as the #3 mobile publisher worldwide, following Google and Meta. Our impressive portfolio features top-ranked games like Mob Control and Block Jam, along with popular applications such as BeReal and Wizz.TeamBlitz, our innovative gaming platform launched in 2021, allows players to engage in mobile games for real cash rewards through head-to-head matches, tournaments, and leagues. By leveraging a unique game library and exclusive titles designed specifically for Blitz, we create an engaging and rewarding experience for our users.We are in search of a skilled Monetization Manager to enhance the economic framework and monetization strategies for Blitz, our real-money gaming platform.RoleAnalyze in-game events, content, and offers to provide strategic recommendations for our monetization strategy.Oversee the virtual economy for Blitz, optimizing meta-features to maintain user engagement (missions, challenges, contests, etc.).Develop and manage pricing strategies for virtual goods and services.Contribute to the planning and strategic direction of Live Operations.Conduct competitive analysis by playing our games and examining competitors' offerings to identify enhancement opportunities.Work closely with Monetization and Art teams to provide critical insights during the strategic planning phase.ProfileMaster's degree in Business or Engineering.Exceptional analytical skills with keen attention to detail and strong organizational abilities.A genuine passion for gaming.Proficiency in both English and French.Collaborative team player with a strong team-oriented mindset.Excellent communication and interpersonal skills, coupled with a positive attitude towards feedback.Demonstrated accountability, independence, and ownership in your work.Nice to have :Familiarity with A/B Testing methodologies.Proficient in SQL.Experience with Tableau for data visualization.

Join the Voodoo TeamFounded in 2013, Voodoo is a leading technology company dedicated to creating captivating mobile games and applications with the goal of entertaining users across the globe. With a robust workforce of 800 talented individuals, we have achieved over 7 billion downloads and boast more than 200 million active users. Voodoo stands as the third largest mobile publisher worldwide by downloads, trailing only Google and Meta. Our impressive portfolio features popular titles such as Mob Control and Block Jam 3D, along with trending apps like BeReal and Wizz.Your RoleAs a Senior Backend Engineer, you will collaborate within a dynamic team of five engineers focused on enhancing our gaming backend platform. This role requires close interaction with various departments, including Core Gaming, Live Gaming, and Engineering & Data. You will contribute to our transition from Hyper-Casual to Hybrid, Casual, and Mid-Core games, playing a pivotal role in scaling our backend architecture to support new and existing titles.Your responsibilities will encompass designing scalable backend systems that serve millions of players daily. You'll partner with client developers and game designers throughout the entire process, from conceptualizing new features to their successful implementation and iteration.

Join Back Market as a Senior Backend Engineer I and be part of our mission to make refurbished devices the first choice for consumers. You will play a critical role in developing and optimizing our B2C services that enhance user experience and drive customer satisfaction. In this position, you'll collaborate with cross-functional teams to design scalable backend solutions, implement robust APIs, and ensure high performance and responsiveness of our applications.

Join us in revolutionizing the shopping experience through AI-powered conversations.At Gorgias, we are pioneering a platform that transforms customer interactions into meaningful relationships. Our vision is to create a unified AI agent that assists, sells, and re-engages customers at every touchpoint in their journey. We believe that Conversational Commerce is the future of eCommerce, and we are at the forefront of this exciting shift.Our mission is to ensure that every brand interaction is personal, seamless, and intelligent. By merging our extensive product knowledge with cutting-edge AI technology, we aim to make the shopping experience feel increasingly intuitive and connected.To achieve this, we are committed to:Quality: Crafting authentic, brand-aligned conversations.Experience: Ensuring a smooth shopping journey from chat to checkout.Re-engagement: Fostering personal dialogues instead of intrusive marketing.With the rapid evolution of AI in retail, Gorgias is laying the groundwork for the next decade of eCommerce. We envision a future where every brand has its intelligent agent, and every customer feels valued and understood.Join us in making Conversational Commerce a reality.Team & ContextGorgias is an AI-first company dedicated to developing innovative products driven by large language models (LLMs) and agent-based systems. We are the leading conversational commerce platform for Shopify merchants. Our AI Journey team is focused on enhancing the marketing aspect of our vision with AI-driven outbound conversations that engage shoppers through various channels, primarily SMS.Our product is actively utilized by merchants today, processing hundreds of millions of shopper events. We are scaling our operations to enhance AI reliability at higher volumes, broaden our shopper engagement capabilities, and solidify our systems for robust production loads. The most intriguing challenges lie ahead.This role is positioned at the nexus of product engineering and applied AI, concentrating on the development of reliable, scalable, and impactful LLM-powered experiences in production.About the RoleIn this role, you will have the opportunity to: Develop and scale production AI features utilized by thousands of merchants. Engage directly with LLMs, prompts, and agent workflows within a live product setting. Influence the architecture of AI systems as we continuously enhance our platform.

Dataiku is the leading platform for AI Success, serving as the enterprise orchestration layer that enables organizations to build, deploy, and govern AI effectively. This unified environment allows teams to design and operate analytics, machine learning, and AI agents with the transparency, collaboration, and control essential for enterprise needs. Positioned above data platforms, cloud infrastructure, and AI services, Dataiku seamlessly integrates the entire enterprise AI stack, empowering organizations to implement AI across diverse vendor environments while maintaining centralized governance.The world’s most prominent companies depend on Dataiku to operationalize AI, transforming it into a genuine engine for business performance that delivers quantifiable value. For more insights, explore the Dataiku blog, LinkedIn, X, and YouTube.About the RoleDataiku is seeking a Senior Engagement Manager to spearhead strategic services engagements across Southern Europe, with a focus on our Manufacturing & Energy clientele.This position transcends traditional project management; you will serve as a Deployment and Value Architect, shaping the client’s AI deployment roadmap, prioritizing their use case portfolio, aligning executives on KPIs and ROI, and ensuring palpable business impact alongside scalable adoption.You will collaborate closely with internal teams, including Account Executives, Customer Success Managers, Technical Account Managers, and Data Scientists, to establish a robust, secure, and scalable Dataiku platform, expediting the journey from concept to production and ensuring replication across various business units.

About VoodooEstablished in 2013, Voodoo is a pioneering technology company dedicated to crafting engaging mobile games and applications that aim to entertain audiences globally. With a dynamic team of 800 professionals, we boast an impressive milestone of 7 billion downloads and over 200 million active users, positioning Voodoo as the third largest mobile publisher worldwide, trailing only Google and Meta. Our diverse portfolio features hit games such as Mob Control and Block Jam, in addition to popular applications like BeReal and Wizz.Our TeamAt BeReal, we are committed to promoting authenticity in social media. By encouraging users to capture and share genuine moments, we build real connections and celebrate everyday life. Our international team, comprising over 60 members, engages more than 30 million monthly active users. With the backing of Voodoo, we are determined to scale BeReal into a leading social network that serves hundreds of millions worldwide.Your RoleAt BeReal, we have built our platform with a compact yet highly skilled technology team, and we intend to maintain this approach as we grow to accommodate hundreds of millions of users. Our commitment to speed allows us to deploy new features faster than any other established social network while we enhance our infrastructure. We operate in small, agile teams, granting each engineer significant autonomy to influence product decisions.Address thrilling technical challenges, given the unique nature of our product, which experiences user surges of millions within short timeframes.Play a vital role in developing a resilient architecture capable of accommodating massive scale as we attract new users and expand globally.Collaborate with product and engineering teams to innovate and implement new app features.Evaluate trade-offs and tackle technical challenges associated with critical backend components.Engage in code and design reviews to uphold our quality standards.Our Technology StackInfrastructure: GCP, Kubernetes, Pub/Sub, GitHub Actions, and ArgoCD.Backend: Go, Node.js (NestJS, Nx, TypeScript)Frontend: Swift (iOS), Kotlin (Android).Database: Spanner, PostgreSQL, Redis.Ideal Candidate ProfileYou possess over 5 years of experience in API development within distributed architectures.You have demonstrated expertise in Go and have a track record of developing high-volume API microservices.You are a self-motivated individual with excellent problem-solving skills and a strong desire to innovate.

Join inetum2, a leader in digital transformation, as a Business Analyst specializing in monetization strategies. In this dynamic role, you will collaborate with cross-functional teams to analyze market trends, optimize revenue streams, and enhance user experiences. Your insights will drive strategic decisions and contribute to the growth of our innovative solutions.

Note: This position requires relocation to our Milan office.About SatispaySatispay aims to transform everyday payments by making them straightforward, equitable, and accessible to all. Our vision has expanded to redefine the future of financial transactions.We are a community empowering millions, united by a common mission to tackle significant challenges. Our approach is swift, bold, and collaborative, fostering an environment where innovation thrives and growth is continuous.As part of the Core Team, you'll engage with vital systems, overseeing interactions with banks, orchestrating payments, and offering the essential infrastructure for Identity and Access Management (IAM). The team also manages risk-related services, focusing on credit risk management and fraud detection.If you are eager to create something impactful that underpins all our product teams, you belong here.Your ResponsibilitiesIn your role as a Senior Backend Software Engineer within the Core Team, you will be pivotal in shaping the backbone of our payment platform. You will ensure the technical excellence and timely delivery of complex systems that influence various services and product teams across the organization.Your daily tasks will include:Core Platform Development: Contributing to the design and enhancement of critical systems like the Transaction Ledger, IAM, and Payment Orchestration, ensuring high performance, scalability, and functionality for seamless integration by product teams.Risk & Financial Services Optimization: Implementing and refining services for bank integrations, credit risk assessment, and real-time fraud detection, developing robust logic that safeguards our financial ecosystem.Technical Leadership: Leading technical analyses for cross-service projects, facilitating discussions, and producing comprehensive documentation (Smart Papers) to ensure clarity and robustness in your designs for stakeholders and engineering teams.