Join Our TeamAt Constructor, we're redefining the ecommerce landscape with our innovative search and discovery platform. Our cutting-edge technology optimizes key performance metrics such as revenue, conversion rates, and profitability. With a search engine built entirely in-house, leveraging transformers and generative LLMs, we empower businesses to enhance their offerings through personalized experiences. We proudly serve major ecommerce brands like Sephora, Under Armour, and Petco, processing over 1 billion queries daily in 150 languages worldwide.Our engineering team is our backbone, continually pushing the boundaries of AI to ensure our proprietary engine remains the best in the market. We believe in fostering a culture of empathy, openness, and continuous improvement, where every team member can excel and drive impactful solutions.About the RoleAs a Full Stack Engineer on the Attribute Enrichment team, you will significantly enhance the customer experience within our dashboards, helping users understand and manage enriched product metadata. Your primary responsibilities will include developing the Attributes Dashboard, creating user-friendly front-end interfaces, advancing our UI architecture, and enhancing the systems that ensure attribute visibility across Search, Browse, and merchant tools.Your contributions will enable customers to navigate, validate, and act on enriched attributes effectively, translating complex ML outputs into clear, actionable insights. Collaboration with machine learning and backend engineers, design partners, and product teams will be crucial in refining the Attribute Enrichment Dashboard and delivering robust full-stack solutions.Key ResponsibilitiesDesign and enhance the Attribute Enrichment Dashboard, focusing on UI components, interactions, and data visualization.Create new features that make enrichment insights transparent and valuable for our customers.Integrate responsive UI designs from Figma into our production environment.

Join Constructor, the pioneering search and product discovery platform specifically designed for enterprise e-commerce, where conversion rates are paramount. With our AI-driven solutions, we facilitate a seamless product discovery experience for shoppers while empowering e-commerce teams to deliver highly personalized interactions that yield remarkable results. Our focus on key e-commerce metrics such as revenue, conversion rate, and profit has enabled us to achieve consistent lifts exceeding $10 million for industry giants like Sephora, Petco, home24, Maxeda Brands, Birkenstock, and The Very Group. Founded in 2015 by Eli Finkelshteyn and Dan McCormick, we are a U.S.-based company leading the charge in e-commerce innovation. To learn more, visit constructor.com.Position OverviewWe are seeking a dynamic and strategic Senior Product Manager to spearhead our Attribute Enrichment team, a vital component of our product strategy. This team is dedicated to enhancing the depth, quality, and breadth of product data through machine learning-driven enrichment, thereby elevating the product discovery experience for our customers.The ideal candidate will be a strategic thinker and a hands-on implementer who thrives in fast-paced settings, enjoys cross-functional collaboration, and is passionate about creating products that address genuine customer needs.Key Responsibilities:Define and execute a high-impact product strategy, prioritizing top value streams for attribute enrichment informed by data, customer insights, and business objectives.Craft and communicate a compelling value proposition for the Attribute Enrichment product, validated through customer feedback.Drive product adoption by leading iterative development and release cycles that enhance customer experience and satisfaction.Collaborate closely with our Product Strategy and go-to-market teams to streamline time-to-demo, ensuring rapid testing of attribute capabilities.Establish and monitor key product performance and quality metrics, utilizing them to guide prioritization and ongoing product enhancements.Engage regularly with customers to collect feedback, pinpoint pain points, and validate roadmap decisions.Advocate for a fast-paced, high-quality iterative product development cycle, ensuring the team can swiftly adapt to changes.Work collaboratively with engineering, product, sales, and customer success teams to optimize workflows and minimize friction.Act as the voice of the customer and the business, ensuring the Attribute Enrichment roadmap aligns with actual needs and delivers measurable value.Stay updated on industry trends and innovations in machine learning enrichment.Qualifications:Minimum of 5 years of product management experience, demonstrating a successful track record of launching high-quality products in fast-paced, technical environments.Strong analytical skills, with the ability to interpret complex data and make data-driven decisions.Excellent communication and interpersonal skills, enabling effective collaboration across teams and with customers.Experience with machine learning concepts and their application in product enrichment is a plus.Proven ability to lead cross-functional teams and manage multiple projects simultaneously.

Role Overview Leadtech is looking for an App Attribution & Growth Specialist to help drive app performance and user acquisition. This fully remote position is open to candidates based in Spain. What You Will Do Develop and execute strategies to boost app growth and optimize user acquisition. Track user engagement and analyze data to improve return on investment. Apply attribution models to understand user behavior and inform marketing decisions. Work closely with other teams to align on app growth objectives and deliver results. Collaboration and Impact This role sits within the marketing team and involves regular collaboration with colleagues across departments. Insights from attribution and user analysis will help shape Leadtech’s marketing approach and support business goals.

About UsConstructor is a pioneering platform revolutionizing search and discovery in the ecommerce sector. We are dedicated to optimizing critical metrics such as revenue, conversion rates, and profit margins. Our search engine is entirely developed in-house, utilizing advanced transformer models and generative large language models (LLMs). This foundational technology empowers various applications, from search functionalities to personalized recommendations and interactive shopping agents. Engineering is our largest department, and we are proud to affirm that our proprietary engine has consistently outperformed competitors in A/B testing, a testament to our commitment to excellence. We are at the forefront of AI innovation, constantly pushing boundaries to maintain our edge in the market.Our engine is designed for extreme scalability, processing over 1 billion queries daily across 150 languages and approximately 100 countries. Our technology supports some of the world's leading ecommerce brands, including Sephora, Under Armour, and Petco.At Constructor, we are a passionate team eager to solve complex challenges and enhance the experiences of our customers and colleagues alike. We prioritize values such as empathy, openness, curiosity, and a commitment to continuous improvement. We believe that empowering everyone within the organization to excel in their roles leads to remarkable outcomes.Founded in 2019 by Eli Finkelshteyn and Dan McCormick, Constructor is a U.S.-based company that continues to thrive under their leadership.About the TeamThe Recommendations team is pivotal in enhancing user experiences for our customers and their end-users. We comprise a dedicated group of cross-functional engineers who thrive on challenges and are committed to improving lives through technology. We uphold values of transparency, curiosity, and continuous refinement in our work, believing that empowering team members to take initiative fosters exceptional results.Our team is focused on advancing traditional product discovery methods while exploring innovative solutions powered by large language models, pioneering a new era of user engagement and innovation.The Recommendations team manages multiple service endpoints and develops our own cloud-deployed solutions using Python, which necessitates leveraging NoSQL databases and interfacing with both internal and external services. Our future roadmap includes transitioning all major developments into high-load distributed services.About the JobThis role primarily involves designing, delivering, and maintaining high-load real-time web services in close collaboration with talented engineers from both the recommendations team and other departments.Develop, deploy, and support robust recommendation services, including I/O-bound web services, CPU-bound services, and data services.Create AWS CloudFormation scripts, Jenkins jobs, and GitHub actions adhering to industry best practices.Establish service observability, monitoring metrics, and alerting mechanisms (using tools like Prometheus and Grafana).

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!

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.

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.

Grafana Labs creates open-source observability tools trusted by millions around the globe. The company’s dashboards and software support organizations such as Bloomberg and eBay, and have been featured in settings ranging from NASA missions to major sporting events. The team works fully remotely, emphasizing transparency, autonomy, and work that matters. Role overview This Senior Backend Engineer position focuses on the Grafana Mimir open-source project. The role is part of a remote team in Spain, working within a specialized sub-squad (either Query or Storage). The team is responsible for Grafana Cloud Metrics across leading cloud providers, building and maintaining distributed systems that must deliver high reliability and strong performance. What you will do Work on large-scale backend development within the Mimir codebase Analyze production operations to boost system performance and reliability Write and review pull requests to maintain code quality Guide automated release processes for the team’s software Take part in the on-call rotation for the systems owned by your team Collaboration The role involves close collaboration with experienced engineers in an environment that values open communication and shared responsibility. The team supports each other to deliver scalable, impactful software. Location This is a fully remote role based in Spain.

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.

Grafana Labs is a pioneering, remote-first company known for its open-source innovation. With over 20 million users worldwide utilizing Grafana, our acclaimed visualization tool tracks everything from environmental changes to vital medical devices. Our dashboards are iconic, having been featured at events ranging from NASA launches to the Tour de France. We empower over 3,000 organizations, including industry giants like Bloomberg, JPMorgan Chase, and eBay, to navigate their observability strategies through our Grafana LGTM Stack, which can be fully managed with Grafana Cloud or self-managed with the Grafana Enterprise Stack, both offering scalable metrics (Grafana Mimir), logs (Grafana Loki), and traces (Grafana Tempo).As we experience rapid growth, we remain committed to our core values: a robust open-source foundation, a collaborative global culture, and a dedication to impactful work. Our team excels in an environment driven by innovation, where transparency, autonomy, and trust are paramount.If you find this role intriguing, don't hesitate to apply, even if you don't meet every single requirement. This could be a pivotal moment in your career.Senior Backend Engineer - AlertingThis is a remote opportunity, and we welcome applications from Spain.The Opportunity:The Grafana Alerting team plays a vital role in the Grafana open-source project (link), dedicated to delivering comprehensive alert management solutions. Our backend team collaborates closely with clients and Grafana Cloud teams to ensure alerting operates seamlessly, whether on-premises or in the cloud.Our work encompasses a wide array of projects, including:Developing distributed systems to enhance the ingestion and delivery of Prometheus-based alerts.Standardizing alert setup and delivery for both Grafana and Prometheus-based alerts.Building distributed systems to efficiently evaluate Grafana-managed alerts, achieving over 500 evaluations per second in production.Grafana Alerting is trusted by leading organizations worldwide, safeguarding crucial medical apparatus and critical infrastructure. We thrive...

Welcome to Fever!We are Fever, the premier technology platform dedicated to culture and live entertainment.Our goal? To make culture and entertainment accessible to everyone. Leveraging our innovative technology and data-driven strategies, we are transforming the way audiences engage with live events. Each month, our platform encourages over 300 million individuals across more than 40 countries to explore unforgettable experiences while equipping event creators with the tools to expand, innovate, and elevate their offerings.Our achievements? Collaborations with industry giants like Netflix, F.C. Barcelona, and Primavera Sound, the presentation of internationally recognized experiences, and backing from several prominent global investors! Impressive, right?To realize our vision, we seek talented individuals with a proactive approach who are keen to shape the future of entertainment!Are you ready to join us on this journey?Now, let’s dive into the specifics of this role and how you will contribute to Fever’s mission.

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.

Our Mission: Empowering small and medium-sized enterprises (SMEs) to flourish in their business endeavors by providing Europe's premier financial workspace. We integrate top-tier tools such as seamless invoicing, spend management, and pre-accounting with attentive 24/7 support, all aimed at simplifying financial processes for businesses.Our Journey: Established by Alexandre and Steve in July 2017, Qonto has swiftly earned the trust of over 600,000 customers. With our dedicated team of more than 1,600 Qontoers, we've been honored in the LinkedIn Top Companies French ranking!Our Values:Customer Focus | We prioritize the needs of our customers above all.Ownership | Take responsibility for your work and drive results.Teamwork | Collaborate effectively to achieve common goals.Mastery | Strive for continuous improvement and excellence.Integrity | Uphold ethical standards and respect everyone.Our Beliefs: At Qonto, we are dedicated to cultivating an inclusive environment where all individuals can excel. We evaluate candidates solely based on skills and potential, and we proudly support diversity within our workforce, comprising 55% international team members, 44% women, and 20% parents. Join us in fostering a workplace that embraces diversity and individuality.Learn about our initiatives for a discrimination-free hiring process.

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!

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.

At Affirm, we are redefining credit to be more transparent and user-friendly, enabling consumers to enjoy the flexibility of buying now and paying later without hidden fees or accruing interest.The Comms Platform team plays a pivotal role in sustaining our organization's success by managing essential services that facilitate transactional communications to our customers through email, SMS, and push notifications. These services require meticulous attention to detail, proactive maintenance, and quick response times to ensure uninterrupted operations.Our current high-priority projects include re-architecting and modernizing our platform, enhancing high availability, and expanding internationalization efforts. These initiatives are crucial for our growth and competitiveness in the market. They demand dedicated expertise and resources to be executed effectively. Without sufficient capacity, we risk delays, reduced quality, and missed opportunities to achieve our strategic objectives. Most importantly, we aim to provide our customers with timely and high-quality communications!Your Responsibilities· Own and drive quarterly goals for your team, leading engineers through uncertainties to resolve complex challenges while ensuring team support throughout the delivery process.· Collaborate with peers and stakeholders in the product development lifecycle, working closely with product management, design, and analytics during ideation, articulating technical constraints, and making decisions that carefully weigh risks and trade-offs.· Proactively identify and advocate for solutions to project, process, technology, or business issues.· Ensure the operation and availability of your team’s artifacts by establishing and monitoring metrics, escalating when necessary, and supporting on-call duties.· Cultivate a culture of quality and ownership within your team by setting or enhancing code review and design standards, advocating for them beyond your team through your writing and technical talks.· Mentor and develop talent within your team by providing constructive feedback and guidance, leading by example.· Participate in an on-call rotation as part of your responsibilities.

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.

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.