JavaScript Engineer

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.

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.

As a JavaScript engineer on the Customer Data Integrations team, you’ll focus on building tools and systems that help customers integrate with our platform more effectively. This includes developing dashboards, improving behavioral tracking, and creating monitoring and alerting systems to proactively surface issues. Your work will help improve data visibility, reduce manual troubleshooting, and give both our team and our customers more confidence in integration health.

In addition to engineering work, you’ll play a hands-on role in supporting customers - working directly with them to provide technical guidance, validate integration quality, and ensure successful launches. You’ll also collaborate with internal teams to turn common integration challenges into scalable solutions.

Your 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.
• Working closely with other integration-focused teams to identify recurring integration issues and develop scalable solutions.
• Building and maintaining internal tools that improve visibility into customer integrations, such as dashboards and systems that highlight data quality and integration health.
• Supporting the evolution of our event tracking capabilities to ensure reliable, scalable data collection for integration and product use cases.
• Contributing to improving documentation, training materials, and developer resources for customers and internal teams.
• Partnering with Product, Customer Success, and other engineering teams to shape the future of integrations with customers.

• 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

Requirements

• Minimum two years of professional and/or academic experience in software engineering.
• Strong communication and interpersonal skills, with enthusiasm for working directly with customers and collaborating across teams.
• Enjoys solving new problems daily while partnering closely with internal teams.
• Proficient in JavaScript, with experience building applications using React and server-side technologies like Node.js (TypeScript experience is a plus!).
• Solid understanding of front-end fundamentals such as DOM parsing/manipulation and browser debugging.
• Familiarity with building dashboards, monitoring systems, or data visualization tools is a plus.
• Quick learner with the ability to adapt to new technologies, design patterns, and evolving integration challenges.
• Comfortable troubleshooting complex issues, validating data quality, and translating customer feedback into scalable solutions.
• Bonus points for experience with tools for querying, managing, or analyzing data (e.g., OpenSearch, ClickHouse, SQL).
• Ability to work between PST and GMT+1 time zones.

Benefits