Backend Engineer

jobgether is looking for a Backend Engineer based in Spain. This position centers on building and maintaining server-side applications that support the company’s products. Role overview The Backend Engineer will develop features and maintain the backend systems, focusing on performance and responsiveness. Collaboration with front-end developers is a key part…

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.

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.

Airapps is looking for a Backend DevOps Engineer in Barcelona to help strengthen cloud infrastructure and improve deployment processes. This position involves working closely with teams from different disciplines to build scalable systems and automate key workflows. Role overview The Backend DevOps Engineer will focus on supporting and optimizing cloud-based environments. The work includes streamlining deployment pipelines and maintaining high performance for applications across the company. Collaboration This role requires frequent collaboration with cross-functional groups. Sharing knowledge and finding practical solutions together will be part of daily work. Key responsibilities Enhancing and maintaining cloud infrastructure Automating deployment and operational workflows Working with teams to deliver scalable solutions Ensuring applications run efficiently and reliably

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.

airapps is hiring a Backend DevOps Engineer in Barcelona. This position focuses on improving how development and operations work together to support backend systems. Role overview The Backend DevOps Engineer will help refine and optimize processes that connect software development with IT operations. The goal is to create smoother workflows and support the reliability of backend infrastructure. What you will do Work closely with team members to streamline development and deployment pipelines Identify and address challenges in backend operations Contribute ideas to enhance backend systems and processes What we look for Motivation to improve backend development and operations Interest in solving technical challenges Ability to collaborate with a team in a growing company

As a Senior Backend/Platform Engineer at causaprima, you will be responsible for the foundational platform utilized by our agents. Your expertise will enhance our event-driven architecture, streamline data pipelines, integrate with customer accounting systems, and ensure that our infrastructure is reliable, auditable, and efficient.Key ResponsibilitiesEvent Store Management — Design and maintain an append-only PostgreSQL database featuring tamper-evident hash chaining, real-time event distribution, agent replay, recovery capabilities, and schema versioning.Cryptographic Signature Infrastructure — Establish key management and signature verification systems for all agent events while implementing approval chains for external actions.Workflow Constraint Engine — Develop a gateway to verify authorization for any external actions including emails, payments, or API calls.PII Vault & GDPR Compliance — Create isolated, encrypted storage solutions for personal data, ensuring compliance with the right to erasure and data residency requirements.Multi-Tenancy Management — Implement row-level security and tenant isolation across all data stores, including tenant-scoped LLM API keys.Authorization Framework (Cerbos) — Utilize attribute-based access control for both agents and humans, ensuring deterministic policy evaluation where LLMs do not make authorization decisions.MCP Security Layer — Develop authentication, capability-based scoping per partner, and rate limiting for the Model Context Protocol endpoint.Database Architecture — Focus on PostgreSQL schema design, indexing strategies, performance tuning, and read replica topology.

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!

airapps is hiring a Backend Engineer in Barcelona to help build and improve its applications. This position centers on developing backend systems that support new features and maintain reliability. What you will do Work closely with team members to design and implement backend solutions Contribute to the ongoing development and stability of airapps products Address technical challenges as they arise Who we’re looking for Experience building and maintaining backend systems Comfort working collaboratively in a team setting Motivated to solve problems and support product innovation This role is based in Barcelona and offers the chance to work alongside a group of dedicated engineers focused on building quality applications.

Are you passionate about leveraging AI technologies to enhance backend systems? Join docplanner as a Backend Engineer specializing in AI Integration. In this role, you will collaborate with a dynamic team to design, develop, and implement innovative solutions that integrate AI capabilities into our existing systems.Your expertise will contribute to optimizing processes and improving user experiences across our platforms. If you're ready to take your backend engineering skills to the next level while working with cutting-edge technology, we want to hear from you!

About UsConstructor is revolutionizing the ecommerce landscape with our next-generation search and discovery platform designed to enhance crucial metrics such as revenue, conversion rates, and profitability. Our proprietary search engine, developed entirely in-house, leverages advanced technologies like transformers and generative LLMs to deliver exceptional search experiences, personalized recommendations, and intelligent shopping agents. As the largest department within our organization, our engineering team is dedicated to maintaining the superiority of our technology, consistently outperforming competitors in A/B testing. Our platform is engineered for extreme scalability, handling over 1 billion queries daily across 150 languages and about 100 countries, serving major ecommerce players like Sephora, Under Armour, and Petco. We pride ourselves on our problem-solving capabilities and commitment to improving the experiences of both our customers and colleagues, fostering a culture centered on empathy, openness, curiosity, and continuous improvement. Founded in 2019 by Eli Finkelshteyn and Dan McCormick, Constructor is a U.S.-based company leading the charge in AI innovation.About the TeamThe Experiments team at Constructor is responsible for creating a robust experimentation platform that includes traffic allocation, exposure logging, metric computation, statistical analysis, and user interfaces for launching experiments and interpreting results. Our platform is designed for both internal use and by customers conducting experiments with live traffic, focusing on enhancing the speed, reliability, and interpretability of experiments. Unlike conventional experimentation tools, our platform must accommodate a diverse range of customer integrations, traffic patterns, and industry-specific constraints, presenting unique engineering challenges that have significant real-world implications.The RoleThis position primarily focuses on backend development (Python services and data-intensive systems). While you will occasionally engage with the Dash UI and contribute to Spark jobs, these areas are not the central focus of the role. We prioritize correctness, observability, and product usability over complex infrastructure.Technologies: Python, FastAPI, PostgreSQL, Plotly Dash, PySpark/Databricks, AWS, CloudWatch, Sentry. (Note: Spark-related work constitutes approximately 5–10% of the role — we do not expect you to be a data engineer or manage the data platform.)What You’ll DoDevelop and maintain backend services for experiment assignment, logging, and report generation.Enhance the scalability, performance, and reliability of experiment reporting pipelines.Implement product-facing features in the UI to assist users in launching experiments and analyzing results.

Join our dynamic Engagement Product Development team in Malaga as a QA Backend Automation Engineer! At Betsson Group, we focus on enhancing customer loyalty by providing an exceptional gaming experience that includes Tournaments, personalized campaigns, and much more!Your Key Responsibilities:Gain an in-depth understanding of our products to identify potential weaknesses and improve testing efficiency, ensuring top-notch quality standards.Actively participate in a Scrum team to contribute value to our products.Collaborate with team members to design and implement automated tests using industry-standard tools, boosting reliability and confidence in product updates.Engage in ongoing requirement definitions and development to foster product growth.Encourage a quality-first mindset through coaching and teamwork.Establish and maintain test automation frameworks utilizing the latest technologies and best practices for optimal maintainability and reusability.Perform root cause analyses on issues to deliver actionable feedback.Enhance the Software Delivery process to facilitate quicker delivery of high-quality increments, aiming for Continuous Deployment.

Abacum is looking for a Senior Backend Engineer focused on integrations. This position is fully remote within Spain. Role overview This role centers on designing and building backend solutions that connect Abacum's product with a range of external systems. The work involves improving integration features while maintaining strong performance and scalability. What you will do Create and maintain backend services that enable seamless integration with third-party platforms. Enhance existing product capabilities by developing new integration features. Ensure backend systems operate efficiently and scale to meet business needs. Requirements Experience building backend solutions, with a focus on integrations. Strong understanding of system performance and scalability. Ability to work independently in a remote setting within Spain.

Join our dynamic team at anybotics as a Senior Backend Engineer, specializing in Node.js and TypeScript. In this pivotal role, you will be responsible for designing and implementing scalable backend systems that power our innovative robotic solutions. Collaborate with cross-functional teams to gather requirements, build robust APIs, and ensure seamless integration with our frontend systems.Your contributions will drive the development of cutting-edge technology that enhances automation in various industries. We value creativity, problem-solving, and a passion for technology.

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.

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.

Join our dynamic global team as a Junior Backend Engineer where you will play a crucial role in ensuring the quality, development, and implementation of our software solutions.As part of our technology department, you will collaborate with a diverse group of accomplished professionals located around the world, including teams in Barcelona, New York, London, Manchester, Bucharest, and India. If you’re passionate about technology and keen to make a significant impact within a rapidly growing company, we would love to hear from you!Your Role in TransPerfect – TechOps:The TransPerfect TechOps team has been integral to our success over the past decade, providing innovative technology and services that greatly enhance the experiences of our clients and colleagues. From streamlining workflows for our staff to developing essential services that underpin our GlobalLink platform, our work enables users to navigate complex ecosystems effortlessly.

Location: Madrid Office About Aircall Aircall builds an AI-driven customer communications platform used by over 22,000 businesses worldwide. Our product brings together voice, SMS, WhatsApp, and AI features in a single workspace, helping teams boost revenue, resolve issues faster, and scale their operations efficiently. Headquartered in Paris, Aircall has a strong global footprint with offices in Seattle, Madrid, London, Berlin, San Francisco, New York City, Sydney, and Mexico City. Our company is growing quickly, supported by leading investors and advances in AI across our product lines. Our Culture We focus on customer satisfaction, data-driven decisions, and meaningful results. Team members are encouraged to take ownership, keep learning, and act quickly but thoughtfully. Collaboration, trust, and impact shape our daily work. About the New Product Unit Aircall is launching a New Product Unit dedicated to advancing autonomous sales. The team is building an AI Orchestration Layer that records and understands customer interactions across calls, video, email, and WhatsApp. This system will automate sales workflows such as CRM updates, follow-ups, task creation, and coaching insights. Our long-term vision is a self-optimizing Sales OS powered by specialized AI agents working together to improve revenue processes. Role Overview: Senior Backend Software Engineer (Python) This position calls for an experienced backend engineer with strong Python skills, ready to work beyond traditional backend boundaries. The role suits someone who values both clean architecture and practical progress, and who can balance high-quality work with the need for speed in a startup setting. What You Will Do Tackle complex technical challenges, including distributed systems, AI orchestration, architecture, performance, and scalability Contribute to the design and implementation of backend systems for the AI Orchestration Layer Work closely with product and engineering teams to deliver new features Iterate quickly, shipping solutions and learning from feedback Who Will Thrive Engineers who enjoy solving difficult problems and making architectural decisions Those who can dive deep into technical details while keeping an eye on rapid delivery People who take pride in their work and appreciate the pace of a growing company

As a Senior Backend Software Engineer at Blacklane, you will join one of our autonomous agile teams. Your contributions will enhance the services that drive our innovative platform, improve our back-office systems, and address integration challenges that enable our business partners to seamlessly connect with Blacklane.Our tech stack comprises Ruby, Go, TypeScript, and Java services, designed through Domain-Driven Design (DDD). These services are deployed within our Kubernetes cluster and communicate via domain events using SQS and Kafka. We utilize a variety of data storage technologies, including PostgreSQL, MySQL, Elasticsearch, Redis, and DynamoDB. For infrastructure and cloud resources, we primarily leverage AWS, managing provisioning through Terraform.

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.