About the company At Auctane, we are united by a passion to help businesses deliver — whatever their size, wherever they are, and however they operate. We make it possible for businesses to meet the ever-changing requirements of their industry and customer expectations. Auctane products enable hundreds of thousands of businesses to annually mail and ship billions of items — over $200 billion worth — to recipients around the globe. The Auctane family of mailing and shipping software products includes ShipStation, Stamps.com, ShipStation API, Metapack, GlobalPost, and Packlink. Our partners include Amazon, UPS, USPS, eBay, BigCommerce, Shopify, WooCommerce, and Walmart. Our values Win as One. Delight Customers. Deliver Great Outcomes. About the role As a Software Engineer, you will be responsible for designing, developing, testing, and supporting enterprise integrations. This role will partner with business stakeholders, architects, developers, and operations teams to build scalable, secure, and reusable APIs and integrations that enable critical business processes across the ShipStation Global ecosystem. This role is based in Madrid, Spain Responsibilities Design, develop, test, deploy, and maintain integrations. Build and support API-led connectivity solutions utilizing System, Process, and Experience APIs. Develop integrations utilizing REST APIs, SOAP Web Services, EDI, XML, JSON, flat files, and database technologies. Implement event-driven and asynchronous integration patterns using messaging technologies. Collaborate with architects and technical leads to define integration standards, best practices, and reference architectures. Participate in requirements gathering and technical design sessions with business and technology teams. Develop and maintain DataWeave transformations for data mapping and orchestration. Troubleshoot production integration issues and participate in root cause analysis activities. Support CI/CD pipelines and automated deployment processes. Monitor and optimize integration performance, reliability, and scalability. Conduct peer code reviews and ensure compliance with development standards. Create and maintain technical documentation, API specifications, and operational runbooks. Work closely with infrastructure and security teams to ensure secure integration implementations. What are we looking for? 3+ years of software development experience and 2+ years of experience developing integrations. Experience building RESTful APIs and web services, API design and API lifecycle management. Experience implementing integrations using XML, JSON, XSD, and DataWeave. Experience working with relational databases and SQL. Experience integrating cloud applications. Experience with Git-based source control systems. Experience supporting CI/CD pipelines and automated deployments. Experience troubleshooting complex distributed systems Strong analytical and troubleshooting abilities. Excellent verbal and written communication skills in both Spanish and English Ability to work effectively with business and technical stakeholders. Strong organizational and time-management skills. Ability to manage multiple priorities in a fast-paced environment. Critical thinking and problem-solving capabilities. Commitment to continuous learning and technical excellence What will make you stand out? MuleSoft Developer Certification (Mule 4). MuleSoft Integration Architect certification. Experience with AWS, S3, and SQS or hybrid cloud environments. Experience with EDI transactions and B2B integrations. Experience with Salesforce, ERP, CRM, TMS, or transportation/logistics systems. Experience with monitoring tools such as Datadog, Splunk, or similar platforms. Experience supporting enterprise-scale integration platforms. What do we offer? Clear and transparent compensation plan. The salary range goes from 40,000 € to 52,000 €. We will discuss the indicated range with you in the first recruiting call to ensure that we are on the same page. Flexible salary benefitsSave on personal income tax with Cobee for expenses like transport, restaurants, and kindergarten. Private health insuranceFree for all employees via Cigna, plus we cover 50% for your family members. Generous time offEnjoy 26 days of holiday per year (23 base days + your birthday off, Christmas Eve, and New Year’s Eve). Your gear, your choiceWhether you prefer Mac or Windows, or need an extra screen, we’ll make sure you’re set up for success from day one. Annual Salary ReviewWe’re committed to recognizing your professional growth. Every year, we review salaries to reflect your individual development, achievements, and impact on our business success. Grow your skillsWe offer up to €2000/year in training (certifications, conferences, workshops) to boost your growth—both technical and personal. Learning resourcesAccess internal and external training, including platforms like LinkedIn Learning, completely free. Holistic wellness programIncludes access to Wellhub, Curalinc (psychological support), Rocketlawyer (legal advice), and regular health webinars & challenges. Volunteer dayTake one day off a year to volunteer and give back. Bonus points for sharing pics on Slack! Free therapy vouchersBecause your mental health matters. Health & wellness supportGet up to €55/month to cover your gym or fitness classes (yoga, boxing, pilates, etc.). Weekly language classesImprove or learn a new language (English, Spanish, French, Italian, or German) in small groups with expert instructors—on us! Time for healthGet 8 hours per year for personal medical appointments and 10 hours per year to support your family’s medical needs. Work-life balanceWe’re flexible and people-first. We know life happens, and we aim to make work work for you. Inclusive, upbeat cultureNo suits here—just a welcoming, casual, and respectful space where diversity is celebrated, and you can be your full self. A global, multicultural teamWe’re made up of 20+ nationalities, speaking 10+ languages. All communication is in English, so everyone’s included. Packlink Pro discountEnjoy 99% off your personal shipments using our platform. Referral bonusesKnow someone amazing? Earn €1K–€3K when you refer candidates we hire—depending on the role. Central Madrid officeWhen you want a change of scenery, drop by our office in the heart of Madrid—free snacks and drinks included! Team eventsWe work hard and play hard with regular team-building activities and meetups. #LI-Hybrid
