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JavaScript Engineer : Customer Developer Experience (Remote) at Constructor. About us. Constructor is the next-generation platform for search and discovery in ecommerce, built to explicitly optimize for metrics like revenue, conversion rate, and profit. Our search engine is entirely invented in-house utilizing transformers and generative LLMs, and we use its core and personalization capabilities to power everything from search itself to recommendations to shopping agents. Engineering is by far our largest department, and we’ve built our proprietary engine to be the best on the market, having never lost an A/B test to a competitive technology. We’re passionate about maintaining this and work on the bleeding edge of AI to do so.. Out of necessity, our engine is built for extreme scale and powers over 1 billion queries every day across 150 languages and roughly 100 countries. It is used by some of the biggest ecommerce companies in the world like Sephora, Under Armour, and Petco.. We’re a passionate team who love solving problems and want to make our customers’ and coworkers’ lives better. We value empathy, openness, curiosity, continuous improvement, and are excited by metrics that matter. We believe that empowering everyone in a company to do what they do best can lead to great things.. Constructor is a U.S. based company that has been in the market since 2019. It was founded by Eli Finkelshteyn and Dan McCormick who still lead the company today.. About You. You’re a software engineer who enjoys working across different parts of the tech stack and collaborating with cross-functional teams to solve meaningful problems. You’re a self-starter who’s comfortable navigating ambiguity, triaging issues, and focusing on what matters most. You enjoy partnering with engineers, product managers, data scientists, and designers to build scalable, user-focused solutions. You care about writing clean, maintainable code and are always looking for opportunities to learn, grow, and contribute to a strong team culture.. About the Position. As a JavaScript Engineer on our Customer Developer Experience team, you’ll own development and maintenance of open-source UI components and client libraries that make it effortless to integrate Constructor’s product discovery platform into web and mobile apps. Your specific responsibilities will include:. . Acting as a technical partner to customers during onboarding and integration, offering guidance through calls, and hands-on collaboration.. . Assisting customers asynchronously by troubleshooting, reviewing implementations, and validating data quality - while proactively monitoring integration health to catch and resolve issues early.. . Shipping and maintaining cutting-edge open source TypeScript/React UI libraries that power next-generation retail experiences world-wide.. . Expanding test coverage of open source REST client SDKs that power billions of requests daily.. . Writing clear documentation, sample apps, and tutorials that shorten time-to-value.. . Collaborating closely with Product Management, Customer Success, and other engineering teams to prioritize features and address customer needs effectively.. . Championing Developer Experience (DevX) by creating intuitive tools, comprehensive documentation, and reference examples for integrations.. . How we work. . Remote-first: work from anywhere. . Cross-functional: partner daily with Product, Data Science, and Customer Success. . One-week sprints, daily stand-ups, monthly retros - Lightweight processes that favor rapid continuous development. . High trust, low ego culture focused on outcomes over hours. . Continuous learning encouraged through an annual learning stipend and peer mentorship. . . A minimum of two years professional and / or academic experience in software engineering.. . Proficiency with JavaScript and React (TypeScript experience a plus).. . Ability to communicate with clarity in written and verbal context, comfortable engaging with technical and non-technical stakeholders.. . Strong analytical and problem-solving skills, with the ability to effectively triage issues and prioritize tasks.. . Able to pick up new technologies and design patterns quickly.. . Experience with automated testing fundamentals and best practices.. . Ability to work within GMT-3 and GMT+3 time zones.. . Enjoys interacting with customers and solving new problems daily as well as working closely with internal teams.. . Not required, but beneficial to have experience with:. . . contributing to or maintaining open source projects. . Java, .NET, Python, Swift (iOS) or Kotlin (Android). . Company Location: Brazil.