About OpenSesame

OpenSesame helps develop the world’s most productive and admired workforces. With the most comprehensive catalog of elearning courses from the world’s top publishers, we are here to help our customers every step of the way, from finding courses, mapping them to core competencies, syncing with the LMS to increasing utilization and improving L&D programs.

About the Team

Our engineering team has a strong culture of working in an agile, continuously improving, and automation-oriented environment. We recognize the need to always be evolving, to look objectively at where things are getting better or worse, and take action.

We design and implement new machine learning systems to curate, personalize, and recommend content to OpenSesame customers. We currently own models for recommendations, similar content, search, and course enrichment, and will be embarking on exciting new initiatives over the next year. The team is responsible for end-to-end machine learning systems from experimentation, data exploration, and new proof of concepts to data pipelines, CI/CD, and API development.

About the Job

As a Lead Machine Learning Engineer, you will be a core designer and developer of the machine learning infrastructure we use for all our models. This role will be responsible for building reliable data pipelines, experimentation infrastructure, model training and serving infrastructure, serverless API development, and be an active contributor to the development of new models.

You will design systems that let us move quickly and confidently, while minimizing maintenance overhead so we can focus more of our energy on exciting modeling projects.  You will be expected to be a growing engineer capable of mentoring others, learning from others, and contributing to the team in every way to keep OpenSesame moving forward.

Technical requirements

  • A growth mindset, strong communication skills, and empathy for our users.
  • Proficient in Python.
  • Experience with both the traditional software development lifecycle and the machine learning development lifecycle.
  • Experience with cloud computing infrastructure, preferably in AWS.
  • Experience building and maintaining data pipelines.
  • Experience with an infrastructure-as-code tool, such as Terraform.
  • Understanding of modern cloud networking and monitoring.
  • Knowledge of NLP and recommender modeling techniques.
  • Knowledge and interest in serverless design patterns.
  • Nice to have: experience with ElasticSearch, deep learning, TypeScript, and the technologies described below.

We write in Python, Pandas, Scikit-Learn, PyTorch, and Transformers. The main tools we use are Jupyter Notebooks, AWS SageMaker, AWS Lambda, Terraform, Docker, Github Actions, ElasticSearch, and Snowflake.

Our tech stack outlined above is not fixed.  We strongly believe in using the right technology for a given job and in constantly experimenting with new technologies.

We encourage members of underrepresented communities to apply.  At OpenSesame, we are committed to inclusion across race, gender, religion, age, and identity. 

Become the Best Version of Yourself

We want OpenSesame to reflect the diversity of the communities we serve and the world we live in.
We know that a variety of perspectives and voices strengthen our ability to deliver the spark of learning to everyone. 
We hold ourselves accountable to create more diverse, equitable, and inclusive communities through continuous learning, personal growth, and working to support our customers.
We welcome you to bring your authentic self to our team and grow beyond your expectations.

Apply for this Job

* Required


U.S. Equal Opportunity Employment Information (Completion is voluntary)

Individuals seeking employment at OpenSesame are considered without regards to race, color, religion, national origin, age, sex, marital status, ancestry, physical or mental disability, veteran status, gender identity, or sexual orientation. You are being given the opportunity to provide the following information in order to help us comply with federal and state Equal Employment Opportunity/Affirmative Action record keeping, reporting, and other legal requirements.

Completion of the form is entirely voluntary. Whatever your decision, it will not be considered in the hiring process or thereafter. Any information that you do provide will be recorded and maintained in a confidential file.

Race & Ethnicity Definitions

If you believe you belong to any of the categories of protected veterans listed below, please indicate by making the appropriate selection. As a government contractor subject to Vietnam Era Veterans Readjustment Assistance Act (VEVRAA), we request this information in order to measure the effectiveness of the outreach and positive recruitment efforts we undertake pursuant to VEVRAA. Classification of protected categories is as follows:

A "disabled veteran" is one of the following: a veteran of the U.S. military, ground, naval or air service who is entitled to compensation (or who but for the receipt of military retired pay would be entitled to compensation) under laws administered by the Secretary of Veterans Affairs; or a person who was discharged or released from active duty because of a service-connected disability.

A "recently separated veteran" means any veteran during the three-year period beginning on the date of such veteran's discharge or release from active duty in the U.S. military, ground, naval, or air service.

An "active duty wartime or campaign badge veteran" means a veteran who served on active duty in the U.S. military, ground, naval or air service during a war, or in a campaign or expedition for which a campaign badge has been authorized under the laws administered by the Department of Defense.

An "Armed forces service medal veteran" means a veteran who, while serving on active duty in the U.S. military, ground, naval or air service, participated in a United States military operation for which an Armed Forces service medal was awarded pursuant to Executive Order 12985.

Form CC-305

OMB Control Number 1250-0005

Expires 05/31/2023

Voluntary Self-Identification of Disability

Why are you being asked to complete this form?

We are a federal contractor or subcontractor required by law to provide equal employment opportunity to qualified people with disabilities. We are also required to measure our progress toward having at least 7% of our workforce be individuals with disabilities. To do this, we must ask applicants and employees if they have a disability or have ever had a disability. Because a person may become disabled at any time, we ask all of our employees to update their information at least every five years.

Identifying yourself as an individual with a disability is voluntary, and we hope that you will choose to do so. Your answer will be maintained confidentially and not be seen by selecting officials or anyone else involved in making personnel decisions. Completing the form will not negatively impact you in any way, regardless of whether you have self-identified in the past. For more information about this form or the equal employment obligations of federal contractors under Section 503 of the Rehabilitation Act, visit the U.S. Department of Labor’s Office of Federal Contract Compliance Programs (OFCCP) website at www.dol.gov/ofccp.

How do you know if you have a disability?

You are considered to have a disability if you have a physical or mental impairment or medical condition that substantially limits a major life activity, or if you have a history or record of such an impairment or medical condition.

Disabilities include, but are not limited to:

  • Autism
  • Autoimmune disorder, for example, lupus, fibromyalgia, rheumatoid arthritis, or HIV/AIDS
  • Blind or low vision
  • Cancer
  • Cardiovascular or heart disease
  • Celiac disease
  • Cerebral palsy
  • Deaf or hard of hearing
  • Depression or anxiety
  • Diabetes
  • Epilepsy
  • Gastrointestinal disorders, for example, Crohn's Disease, or irritable bowel syndrome
  • Intellectual disability
  • Missing limbs or partially missing limbs
  • Nervous system condition for example, migraine headaches, Parkinson’s disease, or Multiple sclerosis (MS)
  • Psychiatric condition, for example, bipolar disorder, schizophrenia, PTSD, or major depression

1Section 503 of the Rehabilitation Act of 1973, as amended. For more information about this form or the equal employment obligations of Federal contractors, visit the U.S. Department of Labor's Office of Federal Contract Compliance Programs (OFCCP) website at www.dol.gov/ofccp.

PUBLIC BURDEN STATEMENT: According to the Paperwork Reduction Act of 1995 no persons are required to respond to a collection of information unless such collection displays a valid OMB control number. This survey should take about 5 minutes to complete.