Senior JavaScript Software Engineer en Barcelona, España
Jobtailor
Spain, Barcelona
Responsibilities
- Design, develop, and maintain scalable backend services using Node.js. - Build and optimize cloud-native applications on AWS. - Develop and maintain event-driven and messaging-based architectures using SQS and SNS. - Design and manage serverless solutions with AWS Lambda. - Work with DynamoDB to build high-performance, scalable data solutions. - Collaborate with cross-functional teams to deliver reliable, low-latency backend services. - Monitor, troubleshoot, and optimize system performance, availability, and scalability. - Participate in code reviews and contribute to engineering best practices.
Requirements
+5 years of experience working as a Frontend Engineer.
Strong experience with https://jobeax.com/link/JSd7UYCSg572jJDY and backend application development.
Hands‑on experience with AWS, including: EC2, Lambda, SQS, SNS, DynamoDB.
Experience designing and developing scalable distributed systems.
Knowledge of asynchronous programming and event‑driven architectures.
Experience building RESTful APIs and backend integrations.
Strong problem‑solving and debugging skills.
Excellent communication and collaboration skills.
Core Competencies
Demonstrates expertise in designing and developing scalable backend services using https://jobeax.com/link/JSd7UYCSg572jJDY and AWS technologies, including serverless architectures and event‑driven systems. Strong problem‑solving abilities and effective collaboration skills are essential for delivering high‑performance applications.
... WHY JOIN US If you’re looking for a place to grow, make an impact, and work with people who care, we’d love to meet you! ABOUT THE ROLE We are looking for a Senior Software Engineer to help define an agentic-first approach to software development. This person designs agentic workflows using Java, Spring Boot, React, and ...
... innovaciones impulsan misiones espaciales de próxima generación, combinando ingeniería de precisión, fiabilidad y excelencia tecnológica. Buscamos un/a Ingeniero/a Senior de Software Embebido con experiencia en los sectores de Defensa y Espacio. - Análisis de requisitos: Analizar y desglosar los requisitos para sistemas espaciales ...
... navigating ambiguity, taking ownership, and delivering high-quality solutions in a fast-moving environment. - Bachelor's or master's degree in computer science, Software Engineering, or a related field. - Proven experience in software engineering principles, development processes, technologies, extreme development methodologies ...
The role As a Senior Software Engineer, you will design, build, and operate reliable, scalable backend services and platform capabilities that power product experiences, internal tools, and business-critical workflows. You will lead the development of complex features and systems, improve the performance, reliability, and ...
... for the better—and that starts with building a world-class engineering culture where quality is not just a checkbox, but a foundation. We are looking for a Senior Quality Engineer to join our Quality Platform team. In this role, you won’t just be "testing" software; you will be building the infrastructure and tools that ...
... day-to-day workflows and validate, critique, and refine AI-generated output Nice to have - Bonus: You're motivated to push the boundaries of how AI can improve software engineering best practices and contribute to building AI-enabled products What you'll get - New hire stock equity (RSUs) and employee stock purchase plan (ESPP) ...
About the role As a senior software engineer, you will help build and scale the systems and services that form the foundation of Alpaca and empower millions of users who are trading billions of dollars worth of assets. The market data team is responsible for improving the overall architecture of Alpaca connected to data ...
... internacional, con nuevas líneas estratégicas vinculadas a banca embebida e inteligencia artificial aplicada a finanzas. Misión y ubicación del puesto: Buscamos un/a Senior / Staff Backend Engineer para participar en el diseño y evolución de una plataforma financiera compleja, escalable y segura. La posición puede ser híbrida en ...
... audio information. And whatever we're doing seems to be working. We're #1 in our category, and experiencing exponential growth. Overview We're looking for a Senior Software Engineer to join our Core Experiences Team. This team builds and maintains the foundational services and SDKs that power Speechify's product experience ...
... internacional, con nuevas líneas estratégicas vinculadas a banca embebida e inteligencia artificial aplicada a finanzas. Misión y ubicación del puesto: Buscamos un/a Senior / Staff Backend Engineer para participar en el diseño y evolución de una plataforma financiera compleja, escalable y segura. La posición puede ser híbrida en ...
... did what, what's risky, and what to investigate next. We build features that have to work at scale, and we care deeply about correctness and performance. As a senior engineer, you will lead technical work across this area. You'll partner with product, design, and engineering to turn hard, ambiguous problems into reliable, ...
Sobre el rol Buscamos un Senior Full-Stack Developer apasionado por la tecnología para unirse a nuestro equipo innovador. En esta posición, serás responsable de diseñar, desarrollar y mantener aplicaciones web escalables utilizando Python y JavaScript. Trabajarás en proyectos desafiantes que impactarán a miles de usuarios, ...
Senior Software Engineer Role (Kotlin) You’ll join a close-knit engineering function of around 9 engineers , giving you plenty of ownership, visibility and the opportunity to make a meaningful impact on technical decisions and how the platform evolves. One of the key projects will involve modernising the existing technology ...
Software Engineer (all genders) In Valencia, we are building an agile development center as part of our international engineering organization. We develop maritime sensor-, navigation-, and automation- systems. Join our cross‑functional team and enjoy a modern toolchain, close connections to our other locations, and plenty ...
... software every day. You will collaborate with a team that cares about technical excellence, product value, and continuously improving the way we build and deliver software. ABOUT THE ROLE As a Senior Software Engineer, you will participate in several phases of the product development lifecycle, from technical analysis to release ...
Alpega is seeking a Senior Software Engineer to join the Shipper Products Team in Sant Cugat, Spain. You will participate across the product lifecycle, designing, operating, and maintaining solutions in an Agile setup to deliver high-quality software for logistics professionals. You will collaborate with engineers, QA, ...
... did what, what's risky, and what to investigate next. We build features that have to work at scale, and we care deeply about correctness and performance. As a senior engineer, you will lead technical work across this area. You'll partner with product, design, and engineering to turn hard, ambiguous problems into reliable, ...
Capchase is on a mission to transform how hardware and software companies sell and get paid. Recently named a 2026 Monitor Best Company in Innovation , we are recognized for embedding flexible payment terms directly into the sales workflow — helping teams close faster without the friction of a separate financing system. ...
... continuous learning, and thoughtful speed. If you thrive in a collaborative, fast-moving environment where trust and impact matter, you’ll feel at home here. As a Senior Software Engineer, you will be responsible for the design, development, deployment, and operation of business-critical features that add customer value. Operational ...
The Role We are looking for a Senior Software Engineer to join our Data Ops team. In this role, you will lead the backend development of our internal applications, which directly impact Factorial’s sales and billing ecosystems. Your mission is to engineer highly resilient, scalable backend systems and robust cloud architectures ...