ConstructorCO

Senior Machine Learning Engineer - Recall Team: Search Quality

Turn more ecommerce searches into sales with Constructor.

Constructor

Employee count: 201-500

Salary: 90k-110k USD

Spain only

About Us

Constructor is the only search and product discovery platform tailor-made for enterprise e-commerce where conversions matter. Constructor's AI-first solutions make it easier for shoppers to discover products they want to buy and for e-commerce teams to deliver highly personalized experiences that drive impressive results. Optimizing specifically for e-commerce metrics like revenue, conversion rate and profit, Constructor generates consistent $10M+ lifts for some of the biggest brands in e-commerce, such as Sephora, Petco, home24, Maxeda Brands, Birkenstock and The Very Group.

The Recall team focuses on improving the search system’s quality by increasing the recall and relevancy of the retrieved results. We consistently deliver measurable KPI improvements, resulting in better search experiences and greater transparency in our algorithms for customers.

We are looking for a Machine Learning Engineer with experience in building and optimizing search or recommendation systems.

In this role, you’ll address practical challenges in building and optimizing models that improve search quality. Your work will involve fine-tuning large language models, integrating advanced vector search techniques, and using real-time relevance signals to align results with user intent.

The ideal candidate has a strong background in machine learning and information retrieval, along with experience delivering scalable, production-ready solutions. You’ll collaborate across the stack - from model development to deployment - to drive measurable improvements in search performance and user satisfaction, directly contributing to a superior product discovery experience.

Challenges you will tackle

  • Build and deploy robust ML systems for search, including vector search, results filtering, computer-vision models, etc.
  • Tune large language models (LLMs) to provide expert-level decisions on item relevance, and work on integrating these signals into real-time models.
  • Design metrics to evaluate the relevance and performance of search results, ensuring they align with business goals and user expectations.
  • Collaborate with technical and non-technical partners to develop explanation tools that clearly communicate the impact of our algorithms to stakeholders.
  • Own the full development lifecycle: design solutions, develop and deliver them to production, while ensuring our systems remain stable, performant and scalable.

Requirements

Hard skills:

  • You are proficient in NLP on a high level, and have practical experience with modern architectures.
  • You excel at Python, at least one ML/DL framework (we're using torch), have proficiency with any variant of SQL, and feel comfortable with the big data stack like Spark, Presto/Athena Hive.
  • You have delivered production ML systems and conducted A/B tests to validate their value.
  • You have experience with data pipeline orchestration tools (Airflow) to manage and automate ML workflows.
  • You are an excellent communicator with the ability to translate intuition into data-driven hypotheses that result in engineering solutions that bring significant business value.

Soft skills:

  • Excellent English communication skills.
  • Passion for helping others grow and succeed as developers.
  • Data-driven mindset with a passion for experimenting and using customer feedback to drive decision-making.
  • Strong strategic planning and prioritization skills.
  • Continuous learning and tracking of recent advancements in the field of AI and ML.

Benefits

  • Compensation: base range of 90-110k USD + stock options + work from home bonus
  • Fully remote team - choose where you live
  • Work from home stipend! We want you to have the resources you need to set up your home office
  • Apple laptops provided for new employees
  • Training and development budget for every employee, refreshed each year
  • Parental leave for qualified employees
  • Work with smart people who will help you grow and make a meaningful impact

Diversity, Equity, and Inclusion at Constructor

At Constructor.io we are committed to cultivating a work environment that is diverse, equitable, and inclusive. As an equal opportunity employer, we welcome individuals of all backgrounds and provide equal opportunities to all applicants regardless of their education, diversity of opinion, race, color, religion, gender, gender expression, sexual orientation, national origin, genetics, disability, age, veteran status or affiliation in any other protected group. Studies have shown that women and people of color may be less likely to apply for jobs unless they meet every one of the qualifications listed. Our primary interest is in finding the best candidate for the job. We encourage you to apply even if you don’t meet all of our listed qualifications.

About the job

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Posted on

Job type

Full Time

Experience level

Senior

Salary

Salary: 90k-110k USD

Location requirements

Hiring timezones

Spain +/- 0 hours

About Constructor

Learn more about Constructor and their company culture.

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Turn more ecommerce searches into sales with Constructor. Constructor’s AI-powered search and product discovery platform delivers unmatched KPI optimization and fast ROI for enterprise ecommerce brands — while giving customers a personalized, enjoyable shopping experience.

Endless opportunities for growth. Constructor is a fast-growing startup with opportunities around every corner. It’s the perfect place for someone looking to grow their career, expand their horizons, and learn new things.

Solve challenging problems with innovation. Search provides a rich, fascinating set of problems to solve. Whether it’s developing back-end algorithms or discussing our customer’s pain points in sales calls, we get to spend our days tackling some of the world’s most fascinating challenges.

Diverse and inclusive workplace. We are committed to cultivating a work environment that is diverse, equitable, and inclusive for people of all backgrounds. We provide equal opportunities to all applicants regardless of their education, diversity of opinion, race, color, religion, gender, gender expression, sexual orientation, national origin, genetics, disability, age, veteran status, or any other protected group. Our internal Diversity and Inclusion ERG provides a space for team members of any and all backgrounds and experiences to connect.

Our core values

We get to the right answer empathetically. We strive to get to the right answer, regardless of who proposed it. We make it easy for others to be able to accept our idea without losing face or hurting ego.

We’re passionate in owning our work and making it have an impact. We care that what we create gets seen by the world. We ask for help, follow-up, hustle until it’s in front of users. We take initiative, even when we think someone else should do it. If we find something we don’t like, we make it better.

We enjoy what we do. We love the problems we get to solve. Most people aren’t lucky enough to work on something this interesting. We create an environment that lets co-workers enjoy their work as much as we do.

Employee benefits

Learn about the employee benefits and perks provided at Constructor.

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Paid Parental Leave

Constructor provides paid parental leave for any qualified team member.

Choose Where You Live

Constructor is a 100% remote-first company. You can live and work from wherever you want!

Company-Sponsored Health Coverage

Constructor pays for 99% of our United States team members’ medical, dental, and vision premiums.

Competitive Compensation

Constructor provides a competitive compensation package, including stock options, for every team member.

View Constructor's employee benefits
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Constructor hiring Senior Machine Learning Engineer - Recall Team: Search Quality • Remote (Work from Home) | Himalayas