Staff Engineer

Join Sonio as a Staff Engineer and become a key player in our innovative team, where your expertise in engineering will shape the future of our cutting-edge technology. You will collaborate with cross-functional teams to design and implement solutions that enhance our products and drive company success.

Dashlane seeks a Staff Platform Engineer - Web to join the Paris team. This position focuses on building and maintaining the core web platform, with an emphasis on performance and user experience. Role overview The Staff Platform Engineer - Web will play a key part in shaping development processes and setting technical direction for web projects. The work centers on delivering secure, efficient solutions that support Dashlane’s standards for quality and reliability. What you will do Lead efforts to improve and maintain the web platform Guide development teams with technical expertise Focus on optimizing performance and user experience Who we’re looking for Experience building and maintaining web platforms Strong interest in technology and user-focused design Enjoys working collaboratively and sharing knowledge Brings innovative ideas to technical challenges

About H:At H, we are at the forefront of advancing superintelligence through agentic AI. Our mission is to automate intricate, multi-step tasks that are traditionally handled by humans, enabling AI agents to unlock the full potential of human capabilities.We are on the lookout for the brightest minds in AI, those who are as committed to building responsibly and safely as they are to pioneering groundbreaking agentic functionalities. We foster a culture of openness, continuous learning, and collaboration, where every team member's contribution is valued.About the Team:The Product Engineering Team plays a critical role in the successful deployment and management of our Agents and Inference platforms, alongside auxiliary services that support our Research department and lay the groundwork for innovative agentic products and services that we offer to the market.Key Responsibilities:Lead the definition of technical architecture, design, and long-term engineering strategy.Design, develop, and maintain complex, high-performance, scalable systems.Mentor and guide engineers across various teams to foster a culture of technical excellence.Perform comprehensive code and design reviews to ensure adherence to quality and security best practices.Collaborate with Research, Engineering, and stakeholders to deliver impactful solutions.Drive enhancements in system reliability, scalability, and observability.Establish and uphold engineering standards, tooling, and processes.Advocate for technical innovation and proactively manage technical debt.

At Joko, we empower consumers to shop smarter. Our mission is to transform the shopping experience, enabling individuals to discover exactly what they need, make informed choices, and save money.Established in Paris, Joko is a certified B Corp tech company with a diverse team of over 90 talented individuals across Paris, Barcelona, New York, and beyond. More than 5 million users benefit from our services daily at over 10,000 merchants.From cashback and automatic coupons to price alerts and carbon tracking, we continuously enhance our offerings to make shopping more intelligent. Currently, we are developing an AI-driven shopping assistant to help users identify the best products based on price, quality, and sustainability.With profitability achieved in our core market, we are now focused on scaling our operations globally, particularly in the United States.Join us on this exciting journey and help shape the future of shopping! Our Engineering TeamOur Engineering team thrives on tackling advanced technical challenges with innovative solutions. Committed to product innovation and design, they are defining the future of the shopping experience. Their goal is to positively influence the daily lives of millions of users around the globe.Software Engineers collaborate closely with the Product team, engaging in exploration, design, roadmap prioritization, implementation, and production deployment. We’ve seen that teams with engineers who have diverse skills and foster close collaboration with product teams can deliver exceptional and innovative user experiences.As our Engineering team expands rapidly, we are dedicated to innovating across all areas of our product and tech stack, empowering a revolution in online shopping. Your ResponsibilitiesAs we scale to over half a million active daily users with zero-downtime expectations, you, as our Senior Staff Platform Engineer, will spearhead and shape our platform initiatives. You will be our pioneering senior engineer in this domain, consolidating current efforts across the team into a structured, reliable, and high-impact platform that accelerates safe shipping.Infrastructure: Enhance our production infrastructure to ensure it is scalable and resilient, focusing on runtime reliability, capacity, and failure management, allowing us to grow swiftly while maintaining stability.Monitoring & Alerting: Develop top-tier observability systems to ensure proactive monitoring and alerting, significantly enhancing our operational capabilities.

About FinaryAt Finary, we are redefining the investment landscape by empowering individual investors with a comprehensive platform for asset tracking, budget management, investment opportunities, and financial education.Since our inception in 2021, we have rapidly grown to serve over 600,000 users. In September 2025, we successfully raised €25M in a Series B funding round led by PayPal Ventures, with notable support from Y Combinator, Hedosophia, Speedinvest, and industry leaders from Qonto, Photoroom, Bitpanda, UBS, and Wise.We prioritize user experience, performance, and the development of products that significantly enhance financial well-being.TL;DRAs a Staff Software Engineer, you will design and develop high-performance backend services in Rust for our fintech platform, catering to over 600,000 users. You will collaborate with a talented team of 6 Rust engineers across various squads, focusing on investment products, cryptocurrency, or life insurance infrastructure.

Join us at iliad-free in Paris as a Staff Engineer specializing in Python. You will take on a pivotal role in our ambitious program aimed at modernizing and evolving our backend systems.Your primary responsibility will be to lead the technical direction of our information system backend, which manages all Free subscribers, including subscription processes, subscriber spaces, and additional services such as video streaming and mobile phone sales.In this role, you will develop a deep understanding of complex business processes executed by our system, such as billing for third-party services, subscription management, and fiber optic connections.You will guide the team in defining the architecture of this distributed system while actively contributing to development using Python, ensuring hands-on involvement.Your expertise will drive development practices that prioritize resilience, quality, testability, and speed of delivery. Additionally, you will be instrumental in establishing robust operational methods in a model where development teams manage their solutions in production, with a constant focus on performance and scalability.

Note: This position requires relocation to our Milan office.About SatispaySatispay is on a transformative journey to simplify everyday payments, making them fair and accessible to everyone. Our mission is to redefine the future of money, empowering millions through collective action to address significant challenges. We're just getting started!As a member of our Core Team, you will engage with critical systems, managing external bank interactions, orchestrating payments, and establishing a robust infrastructure for Identity and Access Management (IAM). The team is also pivotal in risk management, focusing on credit risk and fraud detection.We operate with agility, bold thinking, and mutual trust, challenging conventions while learning and evolving. If you seek more than just a job—if you aspire to create meaningful impact with a talented team—you are in the right place.Your ResponsibilitiesIn your role as a Staff Software Engineer within the Core Team, you will play a critical part in shaping the foundation of our payment platform. You will work on mission-critical engines that power Satispay, ensuring reliability, consistency, and security for millions of users.Daily tasks will include:Define Technical Strategy: Establish the long-term technical vision for our critical domains and architect complex subsystems that serve as the foundation of the company, balancing cross-product requirements with the need for speed and reliability.Architect Core Financial Systems: Design and scale high-throughput engines responsible for the transaction ledger, payment orchestration, and external bank integrations, ensuring accurate and available

Join Our Innovative TeamBecome a pivotal member of the Healthcare Access stream within the Patient Domain at Doctolib. This stream is essential to our product, guiding patients through their entire journey to accessing care, from finding the right practitioner to booking their appointment and beyond.Our teams are addressing some of the most compelling and impactful challenges in digital health: enhancing search and discovery experiences to enable patients to find the right care faster, developing seamless appointment booking processes that function effectively at scale, designing a delightful and dependable patient app experience, and broadening access to healthcare for new users and diverse use cases across Europe.As a Staff Engineer in this stream, your contributions will directly influence the interfaces and systems utilized by millions of patients daily. Here, web performance, frontend architecture, and user experience are not mere engineering considerations; they are integral to how individuals access their health.

Important: This position requires relocation to our Milan office.About SatispayAt Satispay, we are on a mission to transform daily payments into a seamless, equitable, and user-friendly experience. Our vision extends beyond payments; we aim to redefine the future of finance. As a dynamic movement, we empower millions to confront significant challenges with a shared purpose. And this is just the beginning.We pride ourselves on our ability to adapt swiftly, think innovatively, and foster an environment of mutual trust where challenging the status quo is encouraged. If you are seeking more than just another job and aspire to create a meaningful impact alongside a talented team, you have found the right place.Your RoleAs a Staff Software Engineer in our Consumer Wealth team, you will play a pivotal role in defining how our users cultivate and manage their savings and investments. You will be the principal technical authority for the Consumer sector, spearheading initiatives that enable millions to enhance their financial wellness through our innovative savings products and investment solutions.Your daily responsibilities will include:Define Technical Strategy: Formulate the technical strategy for the Consumer Wealth domain. Architect intricate subsystems that support savings and investment features with cross-product considerations, leading impactful initiatives across multiple teams.Advance the Architecture: Design and implement scalable, high-quality systems that address complex financial engineering challenges, streamlining sophisticated back-end systems for wealth management.Technical Thought Leadership: Cultivate cross-organizational partnerships to align technical visions, advocate for our technical agenda both internally and externally, and remain at the forefront of technological advancements in FinTech and wealth management.Develop Talent: Nurture the next generation of technical leaders and promote a culture of excellence in engineering and continuous improvement.Generate Impact: Contribute significantly to users' wealth growth and financial aspirations through your work on the Consumer Wealth back-end infrastructure, directly aligning with Satispay's mission.Prepare for challenges, collaboration, and the autonomy to bring your ideas to fruition. Our tech stack includes a diverse array of technologies, fostering an environment of innovation and creativity.

Join our dynamic team at iliad-free as a Staff Engineer specializing in Python development. We are looking for innovative and driven individuals to contribute to our impactful projects in the heart of Paris. This role offers a unique opportunity to work on cutting-edge technologies and collaborate with talented professionals in a vibrant work environment.

About MorphoMorpho is at the forefront of Decentralized Finance (DeFi), offering an innovative lending protocol that recently raised $50 million from renowned investors such as Ribbit Capital, a16z crypto, Coinbase Ventures, and others. Our goal is to create an open lending network that provides individuals worldwide access to the most favorable terms available. With over $10 billion in deposits on our network, Morpho is setting a new benchmark in DeFi lending. We are expanding our team to solidify our position as a key player not only in DeFi but also in the emerging internet-native financial ecosystem.Our MissionAt Morpho, we aim to empower human ambition by providing open access to capital. We recognize that ambition knows no boundaries, yet access to capital can be limited. The current financial landscape is often closed and disjointed, leading to missed opportunities and unequal access. We strive to ensure that capital flows efficiently to where it is needed most, enabling anyone, anywhere to achieve the best possible terms.LocationThis role can be based in Paris or remotely (from -5h GMT to +2h GMT) to facilitate collaboration with the team.How We WorkWe tackle complex challenges in a rapidly evolving market without predefined guidelines; adapting to uncertainty is part of our daily work. We encourage questioning and transparency, ensuring that decisions are well-founded. Our culture promotes high standards paired with strong support: we assist one another in overcoming obstacles and value open communication with humility. For more on our values, visit morpho.org/jobs.RoleAs a Staff Fullstack Engineer, your mission will be to design, build, and scale Morpho's full-stack systems. You'll enable teams to deliver products swiftly, securely, and reliably across platforms managing billions in Total Value Locked (TVL). Your work will transform intricate requirements into streamlined, high-performance software that enhances product velocity and provides genuine user value.ResponsibilitiesLead the architecture and end-to-end delivery of web applications, APIs, and data indexers, ensuring user impact is achieved promptly and securely.Devise a scalable API and SDK strategy with comprehensive versioning and documentation, empowering numerous external developers to integrate with Morpho.Construct high-performance data pipelines to manage on-chain events effectively.

Role overview The Chief of Staff at hexa works closely with the executive team in Paris. This position plays a key role in shaping the company’s strategy and ensuring that daily operations support long-term goals. The Chief of Staff acts as a connector between leadership and teams, helping to keep priorities clear and projects on track. Key responsibilities Work alongside executives to move the company’s vision and objectives forward Improve internal processes and help leadership make informed decisions Encourage open communication across teams and departments Support the alignment of projects and initiatives with organizational goals Location This position is based in Paris.

Join us in revolutionizing the way we shop through conversations.At Gorgias, we are pioneering a transformative platform that integrates a unified AI agent capable of selling, supporting, and re-engaging customers throughout their shopping experience. We believe that Conversational Commerce is the future of e-commerce, and we are at the forefront of this evolution.Our mission is to cultivate meaningful relationships between brands and customers, making every interaction personal, seamless, and highly intelligent. By merging deep product knowledge with cutting-edge AI technology, we are redefining the shopping experience to be more natural, human, and interconnected than ever before.To achieve our goals, we prioritize:Authenticity: Crafting conversations that resonate with our brand’s voice.Customer Experience: Ensuring a smooth shopping journey from chat to checkout.Personalization: Fostering individual dialogues instead of generic marketing approaches.The potential is immense. As AI transforms consumer purchasing behaviors, Gorgias is laying the groundwork for the next decade of e-commerce, where each brand possesses its own intelligent agent and every customer feels truly valued.Become a part of our journey to bring Conversational Commerce to life.Team & ContextGorgias operates as an AI-first enterprise, creating products that leverage large language models and agent-based systems.As we enhance our AI capabilities, we aim to streamline our evaluation, iteration, and operational processes for these systems in production. Currently, segments of this workflow remain manual or disjointed, particularly concerning prompt iteration, validation, and evaluation.This role is centered on developing and scaling the systems that facilitate AI evaluation and iteration, enabling our team to operate with increased speed and reliability.About the RoleIn this position, you will have the opportunity to: Contribute to production AI systems utilized by thousands of businesses Establish methods for evaluating and enhancing AI performance at scale Create internal platforms and tools for AI and engineering teams Streamline manual processes and accelerate iteration on AI functionalities Collaborate with AI, ML, and product teams‍ Elevate engineering standards and mentor peersWhat You’ll DoDesign and implement systems for assessing AI performance (both offline and online)Develop strategies for robust AI evaluation, validation, and iteration

At Joko, we empower consumers to shop smarter and revolutionize the shopping experience. Our mission is to help individuals make informed decisions, find exactly what they need, and ultimately save money.Founded in Paris, Joko is a certified B Corp tech company with a diverse team of over 90 talented professionals across Paris, Barcelona, New York, and beyond. With more than 5 million users benefiting from our services at over 10,000 merchants, we are changing the way people shop every day.Our innovative solutions range from cashback offers and automatic coupons to price alerts and carbon tracking. We are currently developing an AI-powered shopping assistant designed to help users discover the best products based on price, quality, and environmental impact.Having achieved profitability in our core market, we are now expanding our reach globally, with a strong emphasis on the US market. Join us on this exciting journey as we build the future of shopping! Engineering Team OverviewOur Engineering team thrives on tackling complex technical challenges with elegant solutions. By prioritizing product innovation and design, they are redefining the shopping experience. Their goal is to positively impact the daily lives of millions of users worldwide.As a Staff Mobile Engineer at Joko, you will play a pivotal role in shaping our mobile application. Collaborating closely with the Product team, you will be involved in the entire lifecycle of product development, from exploration and design to implementation and production deployment.Our Engineering team is rapidly growing, fostering continuous innovation across our product and technology stack to revolutionize the online shopping experience. ResponsibilitiesWe value ownership and impact at Joko. In your role as Staff Mobile Engineer, you will take charge of significant components of our mobile application, overseeing everything from technical design to delivery and ongoing enhancements.Mobile Architecture & Development: Contribute to the definition and evolution of our React Native architecture, while designing and developing scalable, maintainable, and high-performance features in our mobile application.Codebase Modernization: Gradually enhance our existing React Native codebase by integrating modern patterns, best practices, and platform capabilities, ensuring a balance between innovation and stability.

About H:At H, we are at the forefront of advancing superintelligence through agentic AI. Our mission is to automate complex, multi-step tasks traditionally performed by humans, empowering individuals to realize their full potential.We are on the lookout for exceptional AI talent who is committed to building technology that is both innovative and responsibly developed. Our culture encourages openness, continuous learning, and collaboration, ensuring that every team member’s voice is valued.About the Team: The Inference team is dedicated to developing and refining the inference stack that powers our cutting-edge agent technology. We prioritize optimizing hardware utilization to achieve high throughput, low latency, and cost-effectiveness, ensuring a smooth user experience.Key Responsibilities:Build scalable, cost-effective inference pipelines with low latency.Enhance model performance focusing on memory usage, throughput, and latency through advanced techniques, including distributed computing, model compression, quantization, and caching.Create specialized GPU kernels for critical tasks, including attention mechanisms and matrix multiplications.Work closely with H's research teams to optimize model architectures for improved inference efficiency.Review and implement insights from state-of-the-art research papers to enhance memory utilization and reduce latency (e.g., Flash Attention, Paged Attention, Continuous Batching).Prioritize and implement leading-edge inference techniques.Requirements:Technical Skills:Master's or PhD in Computer Science, Machine Learning, or a related field.Proficiency in at least one programming language: Python, Rust, or C/C++.Experience in GPU programming, including CUDA, OpenAI Triton, or Metal.Familiarity with model compression and quantization techniques.Soft Skills:A collaborative mindset, thriving in dynamic and multidisciplinary teams.Excellent communication and presentation skills.A passion for exploring new challenges.Bonuses:Experience in related fields and a passion for AI advancements could be advantageous.

Paris | Full-time | Bilingual ( & )Join Bigblue and become a key player in revolutionizing e-commerce logistics! As independent brands grapple with logistics challenges, we are on a mission to enable them to scale efficiently and provide exceptional customer experiences.Since our inception in 2018, we have developed a state-of-the-art logistics platform that currently supports over 500 brands, including renowned names such as MUJI, Aigle, and Cabaïa. With more than 110 talented employees working across Paris, Madrid, and London, we leverage our proprietary WMS (Warehouse Management System) Atlas and our extensive network of 7 warehouses throughout Europe to tackle logistics challenges head-on — delivering solutions that are not only faster and smarter but also greener.Backed by over $20 million in funding and supported by the next generation of e-commerce leaders, we are rapidly expanding our operations — aiming to process 10 million orders in 2024 and beyond. We are seeking a dynamic Chief of Staff to the CEO who can help steer us towards this ambitious future.Role OverviewAs the Chief of Staff to the CEO at Bigblue, you will play a pivotal role in driving our strategic initiatives and ensuring operational excellence. Your entrepreneurial mindset, organizational skills, and results-driven approach will be essential in maintaining alignment across our leadership team and executing key decisions effectively.Key Responsibilities Lead critical strategic projects spanning market expansion and the development of new business lines. Serve as a trusted advisor to the founders on important decisions and new initiatives. Enhance decision-making processes by preparing and following up on executive meetings that align with our strategic priorities. Bridge the gap between leadership and the broader organization, ensuring strategies translate into actionable plans. Oversee company-wide reporting: structure and maintain our KPIs and OKRs, and prepare reports for Board meetings. Streamline and improve internal processes to facilitate Bigblue's efficient scaling while preserving our unique culture.RequirementsWe are looking for a highly organized and results-oriented professional with a strong entrepreneurial spirit. If you are passionate about logistics, e-commerce, and driving strategic initiatives within a fast-paced environment, we want to hear from you.

About H:At H, we are dedicated to redefining the landscape of superintelligence through cutting-edge agentic AI. Our mission is to automate intricate, multi-step processes traditionally executed by humans, empowering AI agents to fully unlock human potential.We are on the lookout for the brightest minds in AI, individuals committed to not only advancing groundbreaking agentic capabilities but also ensuring safety and responsibility in our innovations. Our culture fosters openness, ongoing learning, and collaboration, where every team member’s contribution is valued.About the Team: Our Infrastructure team plays a crucial role in providing seamless access to the necessary resources for our researchers and engineers. We ensure that the infrastructure supporting our public services is robust, reliable, and scalable, enabling impactful work across H, from foundational models to agent development and public service delivery.Key Responsibilities:Architecting and overseeing the infrastructure that supports:Research initiatives in Model and Agent development, including training infrastructure, data pipelines, and inference systems.Product Engineering efforts on H Company’s agent platform, which includes client-facing APIs and agent runtimes across various deployment environments (multi-tenant and on-premises).Establishing and maintaining observability and monitoring strategies to ensure system reliability.

About UsSweetch is an exciting new venture that emerged from Heetch's acquisition of ZeWay's assets in April 2025. Our mission is to (re)launch and operate a network of battery exchange stations for electric scooters in the Paris region, while also marketing the scooters that accompany them.The concept is straightforward yet ingenious: batteries are removable. Once depleted, riders can visit one of our stations, exchange their empty battery for a fully charged one, and continue their journey without delays or compromises.We are starting from scratch, which makes this moment truly unique. You will join a small team that is building something impactful, where every decision matters. If you are eager to learn through hands-on experience, this is the right place for you.Your ResponsibilitiesAt Sweetch, operational tasks abound. You will focus on four main areas:1. Selling Our Stock of ScootersIdentify and activate new customer acquisition channels.Enhance and streamline the end-to-end sales process.Collaborate closely with the sales team to help them achieve their targets.2. Managing Our Battery Exchange NetworkAnalyze network performance and propose concrete initiatives for improvement.Establish preventive maintenance procedures.Optimize interventions when a station is blocked—every minute of downtime counts.3. Overseeing Subscriptions and CollectionsMonitor battery subscription payments and ensure the health of our customer portfolio.Drive customer communication to increase the number of active subscribers and reduce churn.Implement and optimize follow-up processes to enhance collection rates.Identify strategies to retain customers and extend their lifetime value.4. Optimizing Internal OperationsEstablish effective inventory management.Audit, document, and improve our internal processes.Contribute to the administrative tasks related to the acquisition (management of registration cards, etc.).This list is not exhaustive—new projects may arise, and your interests will also be considered.This Role is Perfect for You If…You are a student in an Engineering or Business School, or possess an equivalent academic background, seeking a 6-month internship or gap year opportunity.You thrive in execution and are not afraid to roll up your sleeves when necessary.You are comfortable juggling multiple projects and teams simultaneously.You possess strong analytical skills and can leverage data to make informed decisions.You are proficient with Google Sheets and other analytical tools.

Join Doctrine as the Chief of Staff for Revenue Strategy within our Sales division. In this pivotal role, you will collaborate closely with executive leadership to drive strategic initiatives, optimize revenue processes, and enhance our sales effectiveness. Your insights and leadership will be crucial in shaping our approach to market opportunities and ensuring alignment across teams.

Location: Paris About H H is focused on advancing superintelligence through agentic AI. The team builds AI agents that automate complex, multi-step tasks typically handled by people, aiming to expand what humans can achieve. The company values safety, responsibility, and technical ambition. Openness, ongoing learning, and collaboration shape the culture, and every team member’s perspective matters. About the Inference Team The Inference team designs and improves the infrastructure behind H-models, which power the company’s agent technology. The group’s main goals are to optimize hardware use for high throughput, low latency, and cost efficiency, so users get a seamless experience. What You Will Do Design and build scalable inference pipelines that deliver low latency and control costs. Boost model performance by optimizing memory use, throughput, and latency, using methods like distributed computing, model compression, quantization, and caching. Develop custom GPU kernels for tasks where speed is critical, such as attention mechanisms and matrix multiplications. Work closely with H’s research teams to refine model architectures and improve inference efficiency. Keep up with new research in the field, reviewing recent papers and techniques to improve memory, throughput, and latency (for example: Flash attention, Paged Attention, Continuous batching). Identify, prioritize, and implement the latest inference techniques. Requirements Technical Skills: Master’s or PhD in Computer Science, Machine Learning, or a related field. Skilled in at least one programming language: Python, Rust, or C/C++. Experience with GPU programming frameworks such as CUDA, Open AI Triton, or Metal. Knowledge of model compression and quantization methods. Soft Skills: Works well in collaborative, multidisciplinary teams. Strong communicator and comfortable presenting ideas. Eager to take on new challenges.