Staff Engineer - Fullstack JavaScript/TypeScript

About lemlistAt lemlist, we are on a mission to empower businesses worldwide by providing innovative B2B SaaS solutions designed to foster growth and drive success.With an impressive $43M+ ARR, we have established ourselves as a bootstrapped and profitable organization.Team of 140 talented individuals who thrive in a remote-friendly, agile environment.Majori…

Humanis-Partners is a comprehensive HR consulting firm specializing in recruitment, training, and supporting organizational transformations. We are currently seeking a talented Fullstack TypeScript Developer for our client, a growing technology company focused on payment solutions, to work fully remotely.As a part of an experienced technical team, you will be engaged in developing critical solutions with a strong emphasis on security, reliability, and regulatory compliance (PCI-DSS).Your ResponsibilitiesWorking within an agile team and collaborating closely with the Technical Lead, you will actively contribute to the evolution of a modern payment platform. Your key tasks will include:Developing and maintaining backend APIs and modern frontend interfaces (Next.js App Router).Contributing to critical modules such as:fee calculation engineledger systemsmart routing mechanismsDesigning and optimizing high-performance data models with Prisma / ZenStack and PostgreSQL.Developing merchant and admin dashboards (React).Participating in architectural decisions in a high-security environment (PCI-DSS).Writing robust tests and participating in code reviews.Collaborating closely with the technical team on the platform's evolution.

Join Our Team at lemlistAt lemlist, we are dedicated to empowering businesses globally to achieve remarkable growth through our innovative B2B SaaS solutions.With a strong revenue stream of $43M+ ARR, we pride ourselves on being:Self-funded and profitableA 140-member team that embraces remote work and agile methodologiesMajority-owned by our visionary founder, Guillaume Moubeche, ensuring our independenceOur product suite includes:Sales Engagement with lemlist ($38M ARR, +50% year-on-year growth)Social Selling with Taplio & Tweet Hunter ($5M ARR)Our goal is clear: to become a leading force in the Sales Tech industry. Our guiding principle is simple: Keep growing.About the RoleWe are seeking a Tech Lead or a Senior Fullstack TypeScript Developer to enhance our dynamic team.This role will initially function as a Senior Developer, with the opportunity to transition into a Tech Lead position after 3-6 months based on performance and contributions.Your responsibilities will include designing, developing, and delivering features across both frontend and backend, optimizing performance, and gradually stepping into a leadership role within your squad to establish technical standards, mentor peers, and steer project delivery.Your ResponsibilitiesDevelop new features end-to-end (frontend + backend) in collaboration with a talented Product team.Enhance the codebase through refactoring, bug fixes, and optimizations.Engage with the team to troubleshoot and resolve technical challenges.Mentor other developers, sharing insights and elevating team standards.Assume the role of Tech Lead within your squad: ensuring quality, making technical decisions, and aligning project outcomes.Success MetricsWithin 3 monthsYou will be fully onboarded and confident in our technology stack.You will have launched impactful features in production.You will have contributed to the enhancement of our codebase.Within 6 monthsYou will have established yourself as a leader and technical driver within your squad.

Join our dynamic team at Citech as a Fullstack JavaScript / React Developer! We are seeking a skilled developer to design, develop, and maintain innovative web applications. Leverage your expertise in JavaScript and React to create engaging user experiences and optimize performance.As a key member of our team, you will collaborate with cross-functional teams to deliver high-quality software solutions. If you are passionate about technology and eager to make a significant impact, we want to hear from you!

At Shift Technology, we are at the forefront of the insurance industry's digital transformation through our cutting-edge AI platform. We leverage generative, agentic, and predictive AI to enhance underwriting, streamline claims, and combat fraud and risk, thereby promoting operational efficiency and delivering outstanding customer experiences with tangible business outcomes.Our diverse team, representing over 50 nationalities, thrives in a culture grounded in innovation, trust, and a shared mission to revolutionize insurance through our SaaS solutions.Our dynamic Engineering Team is pivotal to our value proposition. We tackle intricate challenges not just within our squads but also in collaboration with other teams across the organization. If you're passionate about addressing complex technical problems, this is the ideal environment for you! KEY RESPONSIBILITIES As a Fullstack Developer, your technical expertise and independence will empower you to design and implement comprehensive solutions for our applications and features.Craft intuitive user interfaces for data collection and review.Develop and maintain resilient APIs that facilitate automated decision-making.Write, test (from unit tests to end-to-end), and deliver clean, maintainable code.Engage in releases, deployments, and the monitoring of live solutions.Contribute to technical migrations, modernization initiatives, and architectural enhancements as our platforms evolve.Performance, scalability, and quality are crucial challenges to overcome in delivering and reviewing code. You will collaborate with teammates, including software engineers, data scientists, QA specialists, UX designers, and product managers, to provide and receive feedback and continuously enhance the agile development process.

About Us At lemlist, we are revolutionizing sales engagement. Our platform empowers sales teams with an unparalleled advantage, enabling them to book more meetings and close deals effectively. Bootstrapped since inception, we have achieved remarkable growth, reaching $43M ARR in just 7 years, all without external funding. Today, as a profitable B2B SaaS company valued at $150M, we proudly serve over 40,000 sales teams globally.We are on the lookout for a passionate and skilled Senior Fullstack TypeScript Developer to join our dynamic team. In this role, you will take the lead in designing and implementing innovative features for our SaaS products, primarily utilizing Node.js.Your Responsibilities:Design and create new features from the ground up, enhancing both frontend and backend functionalities.Refine and improve the existing codebase through refactoring, bug fixes, and performance optimization.Manage multiple projects concurrently with efficiency.Assist the customer support team by resolving technical issues promptly.Promote knowledge sharing within the team through mentoring and training fellow developers.Key Achievements:By 3 Months:Successfully onboarded and integrated into the team.Gained a comprehensive understanding of our B2B SaaS products and their technical needs.Contributed significantly to new feature development and enhancements to our codebase.By 12 Months:Played a pivotal role in delivering multiple successful projects.Made substantial contributions to the optimization and scalability of our software products.What Awaits You:Join a profitable and fast-growing company that thrives without relying on external funding.Enjoy the opportunity to make a significant impact on innovative products that are transforming various industries.

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.

Internship Overview Sopra Steria is looking for a Fullstack JavaScript Developer intern with a focus on React and Node.js. This internship is based in Bouguenais, near Nantes, and centers on a web migration project. What You Will Do Work alongside the engineering team to design and build web applications. Help migrate existing applications to modern frameworks, using React and Node.js. Ensure applications deliver strong performance and respond smoothly to front-end requests. Gain practical experience with current web technologies by contributing to real projects. Location Bouguenais (Nantes area)

At Contentsquare, we empower organizations with a comprehensive experience intelligence platform that simplifies understanding digital journeys. Our innovative and adaptable platform allows businesses to gain valuable insights into their customers' online behaviors effortlessly.As a global frontrunner in experience analytics, we thrive with a vibrant presence across 15 offices globally. We're committed to long-term growth and are seeking passionate team members who are eager to make an impact and contribute to our expansion.Our mission is to cultivate an inclusive workplace where all employees can learn, thrive, and succeed. Contentsquare fosters a community characterized by boldness, empathy, and intentionality. We invite you to join us in simplifying complexity—for our clients and their customers.Please be cautious of scammers impersonating Contentsquare. We will never request payment or reach out to you via unsolicited communications. For further details, please visit our careers blog.Important Notes: 1. This is a software engineering position requiring a minimum of 5 years of experience, specializing in TypeScript. While we utilize LLMs in our software development, this is not a machine learning role.2. This role offers remote work opportunities available in France, Spain, Italy, Poland, and Germany, with hybrid office options in Barcelona, Paris, Milan, Munich, or Cairo.We are on the lookout for a Senior Fullstack Engineer (Applied AI) to engage in several dynamic product initiatives that harness the power of AI, particularly through Large Language Models (LLMs). A key project includes enhancing our AI CoPilot product (currently exclusive to Heap) to expand its accessibility, enabling non-experts in product or digital experience analytics to effortlessly find answers through simple queries.Our fast-paced environment is dedicated to utilizing LLMs to accelerate insights and streamline setup processes among various other improvements.As our next Senior Software Engineer (Applied AI), you will concentrate on product development alongside initial product iterations. We expect engineers to actively participate in user interviews to validate product hypotheses.This is an exciting chance to work within a “startup inside a startup,” where we swiftly transition from ideation to proof of concept, ensuring that our developments deliver real value to our customers.

Join our dynamic team at Devoteam as a Full Stack Developer specializing in JavaScript and TypeScript with a focus on artificial intelligence. You will work on exciting projects that leverage cutting-edge technology to solve real-world problems. This is an excellent opportunity for someone who is passionate about coding and eager to make a significant impact in the tech industry.

Join amo as one of the pioneering members of our Web Engineering team. In your initial months, you will collaborate closely with the team to develop and manage the systems that drive our operations, analytics, and distribution. We seek adaptable engineers who are eager to take ownership of comprehensive components, from architecture and implementation to monitoring.We prioritize engineers who delve deep into their work, cultivating strong domain expertise and fully embracing the responsibilities of their role. Your contributions will be vital in scaling our web stack, enhancing our internal product philosophy, and accelerating the company’s growth and learning.At amo, our Web team constructs the foundation of our internal platform: from Backoffice tools and growth dashboards to experimentation systems and invite-page infrastructure, as well as analytics implementation and the UI and backend layers that empower other teams to function effectively.Your Daily Responsibilities as a Web Engineer Include:Developing Internal Tools & Backoffice SystemsCrafting internal platforms for data access, monitoring, and operational workflows, collaborating directly with internal users to identify their needs and challenges, translating these insights into scalable, well-engineered solutions that integrate seamlessly into our stack.Managing Growth & Distribution InfrastructureBuilding systems for growth levers, managing distribution flows, and facilitating tracking for acquisition, activation, and retention, including invite pages enriched with OG metadata.Orchestrating SegmentationUtilizing our workflow orchestration system (Restate) to design robust, event-driven workflows that bolster growth mechanisms, data processing, segmentation logic, and lifecycle automation across the platform.Creating Metrics Dashboards & Data VisualizationsDeveloping real-time dashboards that convert metrics into actionable insights for the team.(Optional) AI-Driven AutomationContributing to AI/LLM-powered pipelines for scalable content and metadata generation, delivery, and publishing, with systems that adapt and improve based on performance and/or manual evaluation.End-to-End OwnershipTaking complete ownership of projects from inception to deployment, ensuring quality and efficiency at every stage.

Role Overview inetum2 is looking for a Senior Fullstack Developer to join the team in Toulouse. This role calls for hands-on experience across both frontend and backend technologies. The focus: building and improving software applications that support business goals. What You Will Do Design, develop, and implement software solutions from end to end Work closely with colleagues across different teams to deliver features and improvements Apply modern web development practices to ensure maintainable and scalable code Contribute to creating strong, user-focused applications What We Look For Solid experience with both frontend and backend development Strong grasp of current web technologies and frameworks Commitment to delivering well-crafted user experiences Ability to collaborate effectively with cross-functional teams This position is based in Toulouse.

About UsEstablished in October 2022, Filigran is at the forefront of the cybertech landscape, dedicated to transforming cyber threat management through innovative solutions. Our mission is to create cutting-edge open-source tools that proactively address cyber threats, identify vulnerabilities, and enhance security frameworks for organizations worldwide. Trusted by over 6,000 public and private entities globally, we are committed to ensuring a safer digital environment. The OpportunityWe are seeking a Senior Software Engineer to join our pioneering XTM One team. In this role, you will play a vital part in developing a next-generation product and constructing the core platform for our XTM Suite. Collaborating closely with the Engineering Manager and a dynamic, agile team, you will define the technical architecture and contribute to our unified AI solution, unlocking the full potential of our offerings.This is a high-impact position where you will balance rapid iterations with code quality, establishing a solid foundation for a scalable product. You will not only implement features but also actively shape the product vision by addressing complex challenges. Key ResponsibilitiesFull Stack Architecture: Develop a clean, scalable application deployable as both SaaS and On-Premise, utilizing TypeScript and Python. Design complex visualization flows, advanced logging features, and agent configuration.Architectural Improvement: Enhance the software architecture to integrate seamlessly with Filigran's AI team.Agile Prototyping: Rapidly iterate to test concepts, demonstrating comfort with refactoring or removing code as the product evolves in response to user feedback.Community Engagement: Actively engage with the Open Source community on platforms like GitHub and Slack, providing support and answering inquiries.Team Development: Contribute to the establishment of development processes and team culture as one of the initial members of this new squad. CollaborationReporting Structure: Report directly to the Engineering Manager.Team Dynamics: Be part of the initial squad alongside the Engineering Manager, with plans for rapid team expansion.

Join us as a Frontend Engineer specializing in TypeScript and React at connecthum, an innovative AI infrastructure startup dedicated to developing advanced solutions for the safety and management of large-scale AI systems.About connecthum:A pioneering AI-native product company focused on AI safety and infrastructure.Supported by a diverse group of international investors.Expertly handling large volumes of AI traffic within enterprise environments.Creating and optimizing proprietary models for enhanced performance and reliability.A compact, highly skilled team committed to rapid delivery.Our mission is to develop a robust control and evaluation framework for AI systems, empowering organizations to define, test, and regulate AI behaviors in real-world contexts.Your Contributions:Take ownership of and deliver comprehensive product features across the frontend and full stack.Craft user-friendly, high-quality UX designs that simplify complex AI workflows.Develop seamless product flows, from initial onboarding to advanced analytical capabilities.Work collaboratively with founders, product managers, designers, machine learning experts, and researchers.Translate state-of-the-art AI functionalities into dependable user-centric tools.Lead the product development lifecycle while shaping technical direction and product strategies.This hands-on position lies at the intersection of product development, AI, and engineering.Technical Environment:Proficient in TypeScript, React, and Next.js.Utilizing Tailwind CSS for design systems.Integrating with LLM APIs (OpenAI API, function calling, context orchestration).Creating data visualization and analysis interfaces.Building full-stack product architecture.Ensuring effective production deployment and system observability.Your Skills:Demonstrated expertise in TypeScript, React, and Next.js.Experience in developing product features from concept to deployment.Comfortable working with LLM APIs and navigating AI product workflows.Proven ability to collaborate with multidisciplinary teams.

Join the Voodoo TeamFounded in 2013, Voodoo is a leading tech company dedicated to creating engaging mobile games and applications with the goal of entertaining users around the globe. With a talented workforce of 800 employees, we have achieved over 7 billion downloads and maintain a vibrant community of more than 200 million active users. Ranked as the third largest mobile publisher in terms of downloads, trailing only Google and Meta, our impressive portfolio features hit games like Mob Control and Block Jam, along with popular applications such as BeReal and Wizz.Our Engineering & Data TeamOur Engineering & Data team is at the heart of our innovation, developing cutting-edge technology products and platforms that support the rapid expansion of our gaming and consumer applications, allowing Voodoo to maintain its leadership position in the mobile gaming landscape.About the RoleWe are seeking an enthusiastic Engineering Lead with expertise in TypeScript and Node.js to enhance our Engineering & Data team. In this pivotal role, you will blend your technical expertise with leadership capabilities. You will steer the technical vision of your squad, foster the development of your engineers, and oversee the successful execution of impactful projects. This hybrid role encompasses both coding and team leadership responsibilities.Set the technical direction and architecture for your squad's domain.Lead design reviews, establish coding standards, and champion engineering excellence.Oversee the complete delivery of multifaceted, cross-team technical initiatives.Design, scale, and manage Node.js/TypeScript backend services using AWS/EKS.Develop the infrastructure and reliability strategy for your team's systems.Collaborate with Product and Data teams to translate business objectives into actionable technical roadmaps.Mentor and cultivate engineers through 1:1 sessions, code reviews, and technical coaching.Identify potential risks and proactively drive improvements.Act as an advocate for a robust engineering culture focused on psychological safety, pragmatism, and craftsmanship.

Join our innovative team at jobsforhumanity as a Mid/Senior Fullstack Engineer. In this role, you will be responsible for developing and maintaining robust web applications that deliver exceptional user experiences. Your expertise in both front-end and back-end technologies will play a crucial role in the success of our projects.

Join Voodoo as a Senior Software EngineerFounded in 2013, Voodoo is a dynamic technology company dedicated to crafting engaging mobile games and applications, aiming to entertain a global audience. With a team of 800 talented individuals, we proudly boast 7 billion downloads and over 200 million active users, making us the third-largest mobile publisher worldwide, following Google and Meta. Our diverse portfolio features chart-topping games like Mob Control and Block Jam, as well as popular applications such as BeReal and Wizz.The Engineering & Data team is at the heart of our innovation, developing advanced technology products and platforms that fuel the incredible growth of our gaming and consumer applications, ensuring Voodoo remains a leader in the mobile gaming industry.As a member of our Engineering team, you will work collaboratively within a dedicated squad of up to 10 members, providing an exceptional opportunity to innovate and achieve meaningful results from start to finish.Your RoleWe are seeking a Senior Software Engineer to enhance our Engineering & Data team. In this pivotal role, you will take complete responsibility for your domain, from solution design through to deployment, ensuring a fine balance between quality and efficiency.Design and develop business-oriented full-stack applications in a cutting-edge and evolving environment.Contribute to our innovative growth engine, scaling apps and games to reach millions of users.Engage in strategic discussions and consistently deliver creative solutions to business teams.Exemplify technical excellence and establish best practices—write code that sets a standard.Enhance team tools and champion improvement initiatives.Foster the growth of your teammates.Oversee features from architecture and implementation to deployment and monitoring.Utilize event-driven systems (SQS/SNS) to create robust, decoupled services.

Join Alten as a Fullstack Web Engineer in our Toulouse office, where you will play a vital role in the innovation stage of our projects. You will collaborate with cross-functional teams to design, develop, and maintain web applications that drive our business forward. We are looking for a passionate engineer who thrives in a dynamic environment and is eager to tackle challenging problems.

Explore Our UniverseBe part of the Future of Work! Malt stands as Europe's premier freelance marketplace, linking over 850,000 skilled freelancers with more than 90,000 companies. Since our inception in 2013, we have been revolutionizing work dynamics through our tech-driven, human-focused platform. What sets us apart:- A diverse team of 600 Malters across six European countries- A culture that promotes equality (50% of our executive committee are women) and inclusive growth- Supported by top-tier investors including ISAI, Serena Capital, Eurazeo Growth, Goldman Sachs, and BPI- A mission focused on empowering everyone to work in their own wayAre you ready to help redefine the future of work? Your journey begins here! Discover Your Future Career Malt is on an exciting growth trajectory. To meet our ambitious objectives, we invite you to join our engineering team as a Senior Fullstack Engineer.In this role, you will transcend traditional coding; you will leverage your product-centric mindset to shape features from ideation through to deployment, ensuring they resonate with our users' needs and align with our business objectives.As a Senior Fullstack Engineer, you will integrate into a specialized squad comprising Software Engineers, a Product Designer, and a Product Manager. Each squad will take ownership of a specific business domain and manage the entire development cycle.Learn more about our Engineering team's endeavors in our blog.

Join Verso, where we are revolutionizing consumer insights with our Consumer Intelligence OS. Our innovative AI-driven platform transforms traditional qualitative research methods by continuously analyzing consumer conversations at scale. Rather than relying on one-off studies, our clients gain a structured and ongoing understanding of their customers.Our mission is to embed consumer insights into every product and marketing decision, creating a real-time, always-on system. We are currently starting with AI-moderated interviews, but our long-term vision is to develop a comprehensive system for consumer understanding powered by dynamic workflows.Backed by Hexa (eFounders), we are building on the success of companies like Aircall, Front, Spendesk, Yousign, and many more.Our founding team brings deep expertise in strategy, technology, and entrepreneurship:Lydia - CEO: HEC graduate with 7 years at BCG (Principal), expert in strategy and consumer goods.Camille - CTO: Dual degree from X/HEC, former lead at CO2 AI, specialized in AI and scalable product development.