Software Engineer .NET - Spain

About us 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 play a key role in designing, developing, and maintaining advanced software solutions. You will be responsible for leading projects, participating in strategic technology decision-making, and mentoring less experienced team members. Your expertise in programming and software engineering will be essential for achieving project goals and ensuring the delivery of high-quality products. This role is based in Madrid, Spain. What will you be doing? Designing system architectures and developing complex software components while considering both functional and non-functional requirements. Creating high-quality software code in accordance with industry best practices and standards. Managing software testing processes, identifying and resolving issues, and optimizing system performance and scalability. Delivering cloud-oriented API-based components and microservices adhering to the highest engineering standards. Mentoring junior team members by providing technical support, guidance, and sharing knowledge and experience to facilitate their professional growth. Influencing team direction and task prioritization. Tackling complex problems requiring deep analysis and evaluation of diverse factors. Collaborating closely with other departments, such as production teams, and management, to ensure solution consistency and compliance. Engaging in effective cooperation with team members. Working collaboratively with internal and external stakeholders. Inspiring and facilitating constructive discussions around complex topics. Providing timely, concise, and actionable feedback to team colleagues. Promoting a knowledge-sharing mindset. Participating in recruitment interviews for your team. Maintaining openness to communication with both local and external partners. Developing mentoring skills, fostering learning, and sharing deep engineering expertise with peers. What are we looking for? Experience in designing and developing advanced software systems. Proficiency in object-oriented programming concepts, algorithms, and data structures. Continuous focus on enhancing skills in software architecture design, DevOps practices, and product development. Strong orientation toward task automation to save time and effort. Implementation of improvements and optimizations in daily operations. Planning and managing complex multi-system deployments without impacting client operations. Ability to balance the demands of delivering high-quality software within tight deadlines. Programming across multiple languages. Experience with Agile methodologies and DevOps practices. Expertise in cloud infrastructure automation. Knowledge and experience in use of design patterns Proficiency in English is required for this role What will make you stand out? Experience with: C# .NET TypeScript JavaScript / React (or any other JS framework) Amazon Web Services What do we offer? 💸 Clear and transparent compensation plan. The salary range goes from 34,000 € to 50,000 € . We will discuss the indicated range with you in the first recruiting call to ensure that we are on the same page. 💰 Flexible salary benefits Save on personal income tax with Cobee for expenses like transport, restaurants, and kindergarten. 🩺 Private health insurance Free for all employees via Cigna , plus we cover 50% for your family members . 🌅 Generous time off Enjoy 26 days of holiday per year (23 base days + your 🎂 birthday off , Christmas Eve, and New Year’s Eve). 💻 Your gear, your choice Whether 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 Review We’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 skills We offer up to €2000/year in training (certifications, conferences, workshops) to boost your growth—both technical and personal. 📺 Learning resources Access internal and external training , including platforms like LinkedIn Learning , completely free. 🧘‍♂️ Holistic wellness program Includes access to Wellhub, Curalinc (psychological support), Rocketlawyer (legal advice), and regular health webinars & challenges. 😊 Volunteer day Take one day off a year to volunteer and give back. Bonus points for sharing pics on Slack! 👩‍⚕️ Free therapy vouchers Because your mental health matters. 🏐 Health & wellness support Get up to €55/month to cover your gym or fitness classes (yoga, boxing, pilates, etc.). 🗺️ Weekly language classes Improve or learn a new language (English, Spanish, French, Italian, or German) in small groups with expert instructors—on us! 🏥 Time for health Get 8 hours per year for personal medical appointments and 10 hours per year to support your family’s medical needs. ⚖️ Work-life balance We’re flexible and people-first. We know life happens, and we aim to make work work for you. 💜 Inclusive, upbeat culture No suits here—just a welcoming, casual, and respectful space where diversity is celebrated , and you can be your full self. 🌍 A global, multicultural team We’re made up of 20+ nationalities , speaking 10+ languages . All communication is in English, so everyone’s included. 📦 Packlink Pro discount Enjoy 99% off your personal shipments using our platform. 🔗 Referral bonuses Know someone amazing? Earn €1K–€3K when you refer candidates we hire—depending on the role. 🏢 Central Madrid office When you want a change of scenery, drop by our office in the heart of Madrid— free snacks and drinks included ! 🏟️ Team events We work hard and play hard with regular team-building activities and meetups. #LI-HYBRID