The company and our mission: Zartis is a digital solutions provider working across technology strategy, software engineering and product development. We partner with firms across financial services, MedTech, media, logistics technology, renewable energy, EdTech, e-commerce, and more. Our engineering hubs in EMEA and LATAM are full of talented professionals delivering business success and digital improvement across application development, software architecture, CI/CD, business intelligence, QA automation, and new technology integrations. We are looking for a Principal Software Engineer to work on a project in the e-commerce and website performance optimization sector. The project: Our teammates are talented people that come from a variety of backgrounds. We're committed to building an inclusive culture based on trust and innovation. As a Principal Software Engineer, you will play a crucial role in architecting, scaling, and optimizing our client's core platform and product offerings. Your expertise will drive significant technical improvements and enhance customer satisfaction through effective collaboration and technical contributions. We are looking for someone with good communication skills, ideally with experience making decisions, being proactive, used to building software from scratch, and with good attention to detail. What you will do: Strategic Influence and Leadership Exert significant influence over our client's long-term goals and execution. Collaborate with executive leadership and teams across the organization to define initiatives and the technical roadmap. Ensure alignment of OKR-level goals across the organization. Author technical vision artifacts with a long-term horizon (>1 year) and assist teams in translating this vision into actionable backlogs. Plan improvements and features with a 6-month view, driving significant enhancements in customer satisfaction, ease of onboarding, and technical efficiency. Technical Development and Oversight Drive and oversee the research, development, and design of engineering projects. Solve technical problems of the highest scope, complexity, and ambiguity. Work with Product and Engineering teams to build new internal/external features and enhance our existing product offering. Ship extremely high-impact features and improvements with minimal guidance. Collaboration and Mentorship Provide mentorship for engineers, fostering a culture of continuous learning and improvement. Guide conversations to remove blockers and encourage collaboration. Serve as a point of escalation for sub-department teams facing complex technical challenges. Continuous Improvement Stay current with emerging technologies and industry trends to continually improve our systems and products. Expose technology and organizational needs throughout the department to ensure continuous alignment and improvement. What you will bring: 10+ years of software engineering experience, with a strong background in building and scaling multi-tenant SaaS platforms. Proficiency in modern programming languages such as Typescript (preferred), Python, and JavaScript. Experience with cloud platforms (e.g., AWS), infrastructure as code (e.g., Pulumi), and data storage solutions (e.g., Postgres, Redshift). Demonstrated ability to design and implement scalable, distributed systems. Proficiency in business intelligence tools and SQL, with the ability to analyze data, build data-driven products, and substantiate ideas with quantitative evidence. Demonstrated experience in optimizing website performance and speed, with a deep understanding of web performance best practices, tools (e.g., Lighthouse, WebPageTest), and techniques for reducing load times and improving user experience. Strong understanding of browser optimization techniques, including the use of web workers, lazy loading, code splitting, and other strategies to improve front-end performance. Familiarity with content delivery networks (e.g., Cloudflare), DNS, message queues (e.g., SQS, Kinesis), and CI/CD pipelines. Experience with e-commerce platforms such as Shopify and Salesforce Commerce Cloud is a plus. Strong problem-solving skills, excellent communication and organization, and a collaborative mindset. Experience with Agile and Scrum methodologies. What we offer: 100% Remote Work WFH allowance: Monthly payment as financial support for remote working. Career Growth: We have established a career development program accessible for all employees with a 360º feedback that will help us to guide you in your career progression. Training: For Tech training at Zartis, you have time allocated during the week at your disposal. You can request from a variety of options, such as online courses (from Pluralsight and Educative.io, for example), English classes, books, conferences, and events. Mentoring Program: You can become a mentor in Zartis or you can receive mentorship, or both. Zartis Wellbeing Hub (Kara Connect) : A platform that provides sessions with a range of specialists, including mental health professionals, nutritionists, physiotherapists, fitness coaches, and webinars with such professionals as well. Flexible Working schedule . Multicultural working environment: We organize tech events, webinars, parties, and activities to do online team-building games and contests.