Optimization Data Scientist in Barcelona


35,000 - €60,000
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Job Description

  • Leading on-demand staffing marketplace: we integrate the complete process of selecting, hiring and managing the workforce.
  • Automatizing all the aspect of this process, our proprietary “matching technology” allows us to offer a faster and higher-quality service.
  • Integrating very different AI solutions to improve the experience for both our workers and employers (Shift Optimization, Routing algorithms, Machine Learning algorithms, Quality Score Estimations).
  • Available in multiple countries: UK, Spain, Germany, Sweden, Mexico, Colombia, France and many more by the end of the year.

Main Responsibilities

Be the owner of our different OR projects and Data Analysis.

  • Very strong theoretical and applied knowledge in Operations Research.
  • Experience working with Linear Programming and/or Constraint Programming.
  • Focus on Data Analysis, data retrieval, cleansing, investigations, etc. (SQL/NoSQL/Python).
  • Experience with optimization software and libraries (e.g., or-tools) working in Startup and/or R&D environments.

Offer in Short

  • Ownership of projects with direct impact on the product.
  • Salary in the 35k-60k range (depending on experience) and Equity package.
  • Discount on Health insurance.
  • Yearly conferences/meetup budget.
  • Working in the sunny Barcelona 2 minutes walk to the city center.
  • Free fruit, free coffee and free lunch on Fridays!


Detailed Job Opening

About us

Jobandtalent is a leading on-demand staffing marketplace, being the first business that integrates the complete process of selecting, hiring and managing the workforce all within a mobile app. The automation of this process, and our proprietary “matching technology”, allows us to offer a faster and higher-quality service, at a much more competitive rate as compared to the rest of the traditional industry players.

We currently have offices located in the UK, Spain, Germany, Sweden, Mexico, and Colombia, with plans to expand to France and Italy by the end of the year.

Working at Jobandtalent

Our culture is defined by the exceptional people who work with us. An environment based on trust, transparency, team collaboration and continuous improvement.

Every Jobandtalent employee enjoys great responsibility but also enjoys the flexibility and the opportunity to develop their creativity. We have a saying: “move fast and break things”, so we prefer to make mistakes than to lose an opportunity.

There are no internal barriers, hence, from engineers to commercials, everyone is encouraged to interact together in order to achieve better ideas. Flat organization and multidisciplinary teams are just some of the structures that define the working environment at Jobandtalent.

The great advantage of working with us is to enjoy the work environment we have created: Common areas to rest, think, talk and our special “update” on Fridays where we will be talking about our recent goals, accomplishments, how we look and future plans for the company. All of this with a meal for all the employees courtesy of the company.

We want to continue growing hand in hand with talented people. We are looking for a person with working knowledge to join our team. 

Optimization Data Scientist

Data Science Team

You will be part of the Data Science team, the Research & Development team of Jobandtalent (see the JT Engineering Blog about our search engine and our data infrastructure). This team takes care of different areas inside the company as well as novel and exploratory problems. The team is very independent, able to tackle problems from scratch doing advance research till a solid deploying in a production environment.

We exploit our knowledge to build the optimal solution to a given problem without sacrifice the quality of the code. For these reasons, the members of the team need to cover a very broad skill set and be very open to this dynamic environment. You will work with other scientists as well as engineers and analysts.


  • Work on Mathematical models to optimize different types of optimization problems.
  • Take the ownership of the Python prototypes and follow the implementation by our engineers.
  • Being able to understand when to use a Linear Programming solution versus a Constraint Programming model.
  • Data Analysis: retrieve data from different sources, perform data investigations, get insights, make & prove hypothesis.
  • Data visualization: prepare reports and visualizations, answer questions with charts and data, try to be always one step ahead.
  • Nice to have: Working with Machine Learning models mainly for supervised learning tasks (regression/classification).
  • Nice to have: Having the capacity of understanding different businesses models and concepts, in order to improve them with the help of the data.
  • Make decisions and implement solutions based on your analysis. Do daily follow-ups and help your projects become a success.
  • Contribute to the recruitment and on-boarding of other profiles of the Data Science team.


The candidate should be based in Barcelona performing sporadic trips to Madrid (headquarter).

Requirements and Skills

  • Degree in Mathematics, Operations Research, Engineering – Ph.D. is a big plus.
  • Excellent in retrieving data with SQL and NoSQL databases.
  • Excellent with analysis frameworks such as Python.
  • Very strong theoretical and applied knowledge in Operations Research.
  • Proven experience working with Linear/Mix-Integer ProgrammingConstraint Programmingand Metaheuristics.
  • Experience with optimization software and libraries – or-tools is a big plus.
  • Experience working in startups and R&D environments.
  • Knowledge of Machine Learning models, procedure and algorithms is a plus.
    • Information Retrieval experience is a plus.
    • Recommender Systems experience is a plus.
    • Natural Language processing experience is a plus.
  • Excellent verbal and written communication skills; ability to communicate effectively with different levels of management.
  • Fluent in English is a must, fluent in Spanish is a strong plus.
  • A valid work permit to be employed in Spain.

What we offer

  • Working in the wonderful city of Barcelona
  • Flexible working hours & remote working
  • Equity package
  • Yearly conferences budget
  • Discount on Health insurance
  • A shiny MacBookPro / Linux machine
  • Free lunch on Fridays! (and of course free coffee 24/7)
  • Learn from some of the greatest Engineers, Designers & Product people in Spain

Join us in one of the hottest startups of Spain, learning and contributing with your expertise in innovating the entire job market!


About Jobandtalent

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