Backend Developer (Node.js) at Fundraise Up | Remote

Job Highlights Location: Fully Remote (CET hours preferred) Compensation: €4,700 - €6,100 + stock options Language: Work within a Russian-speaking team About Fundraise Up At Fundraise Up, we are transforming the landscape of nonprofit fundraising by creating a platform that simplifies the donation process, making it quick, seamless, and accessible for everyo…

jobgether seeks a Backend Developer to join its Research Group on a B2B contract. This position centers on developing and enhancing backend systems that support research-focused projects. What you will do Build and refine backend solutions for research initiatives Collaborate with a team that values creative problem solving and strong technical skills Location This is a remote role based in Spain.

Anyone AI seeks experienced Backend Developers based in Spain to support a high-profile AI laboratory project. This remote, part-time role centers on expert evaluation tasks and the creation of realistic software engineering exercises. Role overview As a Backend Developer - AI Trainer, the primary focus is on designing and assessing complex coding challenges. Tasks include bug fixes, feature development, refactoring, migrations, and test generation. The position involves both creating coding scenarios and reviewing peer submissions for accuracy and quality. Responsibilities Design and implement multi-file coding assignments covering bug resolution, new features, refactoring, and testing Write clear, natural-language specifications and provide reference implementations Develop and improve unit and integration test suites Review and evaluate peer-generated tasks for correctness, clarity, and realism Identify edge cases, ambiguities, and potential failure points Ensure alignment between specifications, code, and expected results Requirements Exceptional written English skills 3–7 years of experience in software engineering Advanced proficiency in Python and JavaScript or TypeScript; familiarity with Java, C#, or Go is a plus Background in backend or full-stack development within production settings Knowledge of testing frameworks such as pytest, Jest, JUnit, xUnit, or Go testing Strong debugging skills and the ability to navigate large, multi-file codebases Experience with code reviews, refactoring, and production migrations Engagement details Part-time, project-based work Remote from anywhere in Spain Expected outcomes Deliver high-quality, production-ready coding tasks that meet industry standards

Join BioCatch, the leading innovator in Behavioral Biometrics, where we harness the power of machine learning to analyze users' behavioral patterns online to enhance security. Our mission is to enable a digital world where identity, trust, and ease can coexist. With over 32 of the world's top 100 banks and 210 financial institutions using our BioCatch Connect™ technology, we are at the forefront of combating fraud and fostering digital transformation. We collaborate with industry giants like American Express and Barclays through our Client Innovation Board to explore innovative methods for fraud prevention. With a decade of experience, over 80 registered patents, and a commitment to innovation, we are solving the challenges of tomorrow.Are you an adept backend developer eager to use your expertise to combat cybercrime? At BioCatch, we are searching for a Senior Backend Developer to become part of our passionate team driven by curiosity and innovation. In this role, you will engineer core services and APIs capable of managing high volumes of real-time data while adhering to strict SLA response times. Your work will involve tackling complex scenarios related to big data collection, aggregation, and analysis. Join us at BioCatch to make a significant impact in the fight against cybercrime and fraud.Location: Barcelona, Spain (Hybrid work arrangements)

Role overview Jobgether is seeking a Senior Backend Developer (Node.js) for a partner company based in Spain. This remote-first role centers on building secure and scalable real-time backend systems for digital finance services with a global reach. What you will do Design and develop backend architecture and infrastructure using Node.js Build and maintain critical services, APIs, and financial products Work on distributed systems, optimizing performance for users worldwide Collaborate with engineers across multiple regions Keep up with new technologies and industry best practices Requirements Significant experience with Node.js backend development Strong background in designing scalable and secure systems Ability to solve complex technical problems Interest in backend architecture, distributed systems, and performance optimization Comfort working autonomously and taking ownership of projects in a remote-first environment Work environment The team values autonomy, ownership, and innovation. Work alongside talented engineers and contribute to products used by customers worldwide.

About HSP GroupHSP Group stands as a leading provider of global expansion services, dedicated to alleviating the complexities associated with international operations. Our comprehensive offerings encompass legal entity setup, global HR, payroll, compliance, tax, and advisory, empowering our clients to accelerate growth, ensure compliance, and mitigate risks in new markets.As a pioneering force in the rapidly evolving sector of global expansion management, we are a Stage B startup committed to delivering exceptional value through continuous innovation, execution, and a focus on customer satisfaction. Join our small yet highly skilled and dynamic team, and make a significant impact on our company's trajectory.About Gateway HRGateway HR is our cutting-edge HRIS platform, meticulously crafted for global expansion management. It integrates seamlessly with Gateway GXM, our premier global entity management platform, facilitating functionalities like automated payslip generation, intelligent contract management, and effortless cross-border compliance.Our platform ecosystem incorporates AI-driven document recognition and classification, utilizes an event-driven serverless architecture on Azure, and encompasses a broad range of integrated tools tailored to HR, entity management, and compliance.Job OverviewThis position is fully remote.We seek a talented Lead Backend Engineer to spearhead the technical strategy of Gateway HR and enhance its integration with GXM. Your role will blend hands-on platform development with technical leadership over external development teams, advancing the architecture, crafting innovative features, and upholding HSP's engineering standards throughout the codebase.This role is not purely managerial; you will engage in coding, PR reviews, architectural discussions, and feature delivery while establishing high standards for quality and performance.

About UsAt Fortis Games, we strive to create exceptional gaming experiences that unite players, while also transforming the gaming industry. Our focus is on fostering a sense of community and belonging, both within our games and among our team. We aim to build meaningful connections through the communities we create, generating unforgettable moments. Our commitment to diversity, equity, and inclusion means that everyone’s unique skills and backgrounds are valued, contributing to our innovative game development process.As a dynamic start-up led by industry veterans, Fortis Games offers you a unique opportunity to significantly influence our products and the company's trajectory. If you are passionate about solving complex challenges with effective communication and a collaborative mindset, you might just be the perfect fit for our team.Role OverviewIn your role as a Staff Backend Engineer at Fortis, you will play a vital part in developing our exciting Original IP, guiding it from initial concept through to launch. You will work in close collaboration with talented game designers, artists, and fellow engineers to design, implement, and deliver a large-scale multiplayer experience that will leave a lasting impression on players.Key ResponsibilitiesDevelop and enhance game features from prototyping to live operations, ensuring quality and stability at every stage of the lifecycle.Design, implement, and maintain scalable CI/CD pipelines to optimize development and deployment workflows.Analyze backend systems to identify and resolve complex bugs and performance bottlenecks.Conduct backend load testing to ensure the infrastructure can support high player engagement and peak activity.Collaborate with client-side engineers to create secure, server-authoritative gameplay mechanics.Establish and maintain DevOps workflows in a cloud environment, primarily utilizing AWS services.Produce clear and well-organized technical documentation to communicate design choices and system architecture to the team.Contribute to the development of studio-wide engineering standards by adhering to and shaping best practices in code quality and guidelines.

Role overview Metromakro is hiring a Mid-Senior Backend Developer for a long-term temporary contract in Albuixech. The position focuses on designing, building, and maintaining server-side applications. Efficiency, scalability, and security are central to the work. Main responsibilities Design backend architecture that aligns with business requirements Develop and maintain server-side code Keep applications secure and scalable as new features and users are added What to expect This role provides an opportunity to strengthen backend development skills while working alongside a supportive team. The environment encourages ongoing learning and technical growth.

Join the Digital Revolution!At Aleph, we are not just participating in the digital advertising landscape; we are actively shaping its future. As representatives of the world’s leading platforms, including TikTok, Amazon, Google, and nearly 55 others, we operate across 130+ markets worldwide.Our mission is to empower advertisers and brands to harness the full potential of these platforms' advertising capabilities. By nurturing long-term partnerships, we create limitless opportunities for businesses to advertise effectively at both local and global levels.With a presence spanning multiple continents, Aleph offers you the opportunity to join a rapidly growing and innovative team where your contributions will have a direct impact. If you are ambitious, forward-thinking, and eager to thrive in a dynamic global environment, Aleph is the ideal place to advance your career.We are looking for a talented Senior Backend Developer who excels in designing, building, and maintaining high-throughput, event-driven systems. In this pivotal role, you will be instrumental in shaping our core platform, making vital architectural decisions, and mentoring fellow engineers. Your responsibilities will include ensuring reliable communication between our asynchronous services, facilitating seamless data flows, and enabling our entire ecosystem to scale according to demand. If you are passionate about message queues, stream processing, and the intricacies of distributed systems, we invite you to apply for this exciting opportunity.

Join our dynamic team at bunch as a Senior Backend Engineer, where you will lead the design and development of innovative backend systems. You will collaborate closely with cross-functional teams to deliver high-quality software solutions that enhance user experiences. Your expertise will drive the architecture of scalable applications, ensuring they are robust and efficient.

Role overview Jobgether is looking for a Senior Backend Developer with deep experience in Node.js. This Spain-based position is remote and joins an engineering team dedicated to building backend systems for large-scale digital financial products used around the world. The work centers on creating reliable infrastructure and supporting the growth of a global platform. What you will do Design, build, and maintain backend services in Node.js that are secure, scalable, and highly available Improve the core platform architecture to enhance reliability and support ongoing growth Optimize API performance and contribute to infrastructure resilience Participate in developing new products and driving technical improvements Tackle complex technical challenges involving real-time systems, microservices, and distributed applications How you will work Collaborate with engineers across multiple regions in a remote-first environment Take ownership of projects and work with a high degree of autonomy Requirements Proven experience as a backend developer with strong Node.js skills Ability to build secure and scalable backend systems Interest in infrastructure resilience and performance optimization Drive to solve complex problems in backend development

Become Part of blp – The Leading ERP Automation Solutionblp is a dynamic ETH and HSG spin-off that is revolutionizing ERP automation through innovative AI solutions. Our technology addresses pressing enterprise challenges and fosters a culture of ownership among our team members. Our platform is operational in over 40 countries, empowering more than 20,000 daily active users and automating over 70,000 processes each day.Our AI-driven ERP automation is reshaping sectors such as finance, procurement, logistics, and sales. As one of Switzerland's fastest-growing SaaS scale-ups, we take pride in being self-financed and entirely employee-owned.Our accomplishments are rooted in our deep technological expertise and a thorough understanding of business processes, resulting in an exceptional product that fits the market perfectly, which is validated by our expanding clientele, including Fortune 500 companies.Our rapid expansion and the career opportunities we provide have earned us the LinkedIn Top Startup Award, and we are just beginning our journey. Our headquarters are located on Zürich’s renowned Bahnhofstrasse, an ideal setting for a company that is transforming the way businesses operate.Are you ready to shape the future? Join blp today.About the TeamAt blp, we are dedicated to developing innovative products for automated document processing. Our engineering teams are focused on specific products, such as invoices, customer orders, and order confirmations. Each team takes full ownership of their product, ensuring we comprehend the business challenges our solutions address and guiding the product's development roadmap.We emphasize end-to-end ownership and a commitment to making a tangible impact by tackling real-world challenges. Additionally, we promote a collaborative environment where we collectively decide how to work together and grow, both individually and as a team.Your ResponsibilitiesDrive Impact: Partner with business stakeholders to gather requirements and identify potential enhancements for our product.Build Exceptional Software: Design and create clean, maintainable, and high-quality software. Participate in code reviews and contribute to a culture of technical excellence.Shape Architecture: Collaborate on system design, technology stack selections, and optimizations to ensure scalability, performance, and maintainability.Lead and Influence: Direct technical strategy for significant initiatives, guide product evolution, and mentor team members throughout the process.Promote Innovation and Collaboration: Work closely with colleagues to enhance processes, tools, and team practices while nurturing a culture of continuous learning and growth.

About the Role resilientco is looking for a Senior PHP Backend Engineer based in Spain. This role focuses on building and maintaining backend systems that support core applications. The work centers on PHP and requires experience designing reliable solutions for modern software products.

Role Overview constructor-1 is hiring a Senior Backend Engineer focused on Attribute Enrichment. This position is fully remote within Spain. The role centers on improving backend systems, strengthening data accuracy, and enriching user attributes to support a smooth experience for clients. What You Will Do Enhance and maintain backend systems with a focus on attribute enrichment Work closely with cross-functional teams to develop solutions that improve data quality Help ensure user attributes are accurate and comprehensive for downstream services What We Look For Professional experience with backend technologies Strong problem-solving skills and interest in complex technical challenges Ability to collaborate effectively with colleagues across different functions Location Remote within Spain.

Managing corporate spending can often be a challenging endeavor, with convoluted processes that hinder efficiency for finance teams and employees. At Pleo, we are revolutionizing this process. We provide financial solutions designed to simplify money management, making it seamless and remarkably efficient for everyone involved. Our mission is to empower businesses to 'go beyond' traditional spending methods.The name 'Pleo' translates to 'more than you’d expect', and this philosophy has underpinned our success over the last decade.We find ourselves at a crucial juncture in our growth; every decision we make impacts over 40,000 customers and is vital to our mutual success. We seek individuals who are committed to understanding customer needs, transforming complex challenges into straightforward solutions, and questioning the status quo—all while aiming high. With ambitious goals propelling us forward, we embrace the journey of discovery and innovation. Our team consists of over 850 talented individuals representing more than 100 nationalities, all dedicated to shaping the future of business spending.About the RoleWe are in search of a Senior Backend Engineer to join our dynamic team at Pleo. In this role, you will play a key part in developing and scaling our backend systems while engaging in exciting projects as we enhance our product and service offerings. If you are passionate about tackling complex technical challenges and thrive in a culture that prioritizes transparency, collaboration, and innovation, this position is made for you.Your ResponsibilitiesAs a Senior Backend Engineer, you will:Lead the design, development, and maintenance of scalable microservices primarily using Kotlin.Collaborate with cross-functional teams to create innovative solutions across various domains including Platform and Services.Analyze system performance and implement optimizations to ensure high reliability and scalability.Participate in code reviews, conduct post-mortems, and mentor fellow engineers.Proactively address technical debt and guide the team through technical challenges and migrations.QualificationsYou will excel in this role if you possess:Strong expertise in server-side programming, particularly in Kotlin, and experience with distributed systems, microservices, and various cloud environments such as AWS and Kubernetes.Proficiency in relational databases such as PostgreSQL, testing frameworks (e.g., JUnit, Testcontainers), and observability tools like Grafana.

Join us at Fever, the premier tech platform dedicated to enhancing cultural and live entertainment experiences globally.Our mission is to democratize access to culture and entertainment. Utilizing our advanced technology and data-driven strategies, we are changing how audiences engage with live events. Every month, over 300 million individuals across more than 40 countries discover unforgettable experiences on our platform, while we empower event creators to innovate and grow their reach.We proudly collaborate with industry giants such as Netflix, F.C. Barcelona, and Primavera Sound, delivering internationally acclaimed experiences and backed by leading global investors. Impressive, isn’t it?To further our mission, we seek exceptional talent with a proactive mindset, eager to contribute to the future of entertainment. Are you ready to be part of this journey?The engineering team is the backbone of our user-friendly iOS and Android applications and website, responsible for developing, enhancing, and maintaining all Fever services, ensuring that users have outstanding experiences.About the RolePosition: Senior Software Engineer (Backend Platform)Location: SpainWe are looking for a highly skilled software developer with a proven track record of delivering exceptional results. A person who values code quality and emphasizes doing things correctly, not just completing tasks.Collaborate within an agile, cross-functional team alongside other talented software engineers and product designers.Develop production-quality code and implement solutions capable of handling significant traffic.Mentor team members through code reviews, architecture design sessions, and pair programming.Receive mentorship from colleagues in areas where you seek to grow.During your onboarding period, you will:Engage in a structured program designed to facilitate a smooth transition into your role.

Join Aircall as a Senior Backend/Platform Engineer, where you will play a crucial role in enhancing our platform's infrastructure and backend systems. You will collaborate with cross-functional teams to design and implement scalable solutions that ensure seamless communication for our users. If you are passionate about crafting high-performance systems and thrive in a dynamic environment, we would love to hear from you!

Join Our Team as a Lead Backend Engineer At N26, we're redefining banking with a focus on innovation and technology. As a member of our Intelligent Operations Platforms (IOP) and Assistance segments, you will play a critical role in enhancing our operations and empowering other tech teams through a robust platform approach. We are looking for a skilled Lead Backend Engineer to join our dynamic cross-functional teams. You will work within a microservice architecture, primarily utilizing Java and Kotlin with Spring Boot, to evolve our product offerings. Our teams thrive on collaboration, knowledge sharing, and autonomy, ensuring that every member's voice is heard and valued. As a Lead Engineer at N26, you will be at the forefront of integrating the latest technological advancements while tackling complex and engaging challenges daily. Your Responsibilities: Shape your team’s technical landscape by collaborating closely with Product Managers and Engineering Managers to manage product technical roadmaps and dependencies, thereby minimizing technical debt. Architect and build high-availability, high-performance web applications that serve as the backbone of our internal operations. Promote a culture of solid engineering delivery by demonstrating best practices, writing clean, well-tested, and well-refactored code, and deploying it to production frequently. Integrate AI: Implement new features and integrations with foundational models and automation systems to empower our back-office teams. Scale systems by optimizing, measuring, and monitoring distributed systems for seamless and continuous software delivery. Mentor team members and document processes to foster engineering excellence and knowledge sharing, avoiding silos. Lead initiatives aimed at enhancing our engineering culture across the company and explore ways to maximize team and organizational effectiveness. Participate in recruitment and employer branding initiatives to strengthen our engineering team. Qualifications for Success: Engineering Mindset & Design: Proficient in design patterns with a solid understanding of object-oriented programming and distributed systems principles, utilizing methodologies such as Domain-Driven Design and architectural patterns like Hexagonal, Event-Driven, and Microservices. Possess a strong track record of applying engineering best practices, including Clean Code, Test-Driven Development (TDD), Behavior-Driven Development (BDD), and deep observability. Experience in AI-augmented development frameworks and practices, showcasing the ability to leverage AI in enhancing software solutions.

Join Exoticca as a Senior Backend Software Engineer!About UsExoticca is a trailblazing online travel agency dedicated to transforming the way people experience long-distance travel. Our mission revolves around crafting memorable life experiences through exceptional travel adventures. We pride ourselves on offering unmatched value, exploring diverse destinations, and creating extraordinary travel journeys while prioritizing our customers and the environment.Our vibrant, multicultural team is expanding rapidly, and we are on the lookout for passionate individuals who can contribute to building a pioneering travel company that redefines the industry.Your RoleWe are seeking a Senior Backend Software Engineer who excels at problem-solving. You will leverage engineering as a powerful tool to address real-world customer and business challenges.This position falls within our Trip Management System domain, where you will empower our travel specialists to design remarkable journeys at scale. You will contribute to the systems that convert destinations, itineraries, flights, hotels, and pricing strategies into structured, market-ready travel products. Through seamless product configuration, accuracy, and scalability, your work will directly enhance revenue, operational excellence, and customer satisfaction.While technology choices are important, the impact of your work is paramount. You will engage with PHP, Node.js, and contemporary AI tools, selecting the optimal approach for each unique challenge without being limited to a single technology stack.Why Join Us?Engage with genuine, impactful challenges that enhance customer experiences.Enjoy the freedom to select the right tools, including advanced AI technologies.Work within a team that values initiative, ownership, and meaningful contributions over titles and bureaucracy.Face scale-up challenges with opportunities to influence architecture, products, and workflows.If you seek stimulating problems, autonomy, and opportunities for professional growth, we welcome you!

airapps is looking for a Backend DevOps Engineer based in Madrid. This position focuses on improving development workflows and supporting reliable application deployments. Role overview The Backend DevOps Engineer will work with both development and operations teams. The main goal is to make development processes smoother and ensure that applications are deployed efficiently. What you will do Collaborate with team members to implement continuous integration and continuous deployment (CI/CD) pipelines Manage and maintain cloud infrastructure Work to improve system performance and reliability Location This role is based in Madrid.