Joose Rajamäki

AI Researcher

Helsinki, Uusimaa, Finland15 yrs 4 mos experience
Most Likely To SwitchHighly Stable

Key Highlights

  • Expert in data science and machine learning applications.
  • Proven track record in logistics optimization.
  • Strong background in software engineering and CI/CD practices.
Stackforce AI infers this person is a Logistics Data Scientist with strong software engineering skills.

Contact

Skills

Core Skills

Data ScienceMachine LearningSoftware Engineering

Other Skills

Routing OptimizationC++Traffic ModelingCI/CDStatisticsMatlabLaTeXSignal ProcessingElectronicsData AnalysisJavaPythonRF EngineeringComputational MathematicsRF MEMS

Experience

15 yrs 4 mos
Total Experience
1 yr 8 mos
Average Tenure
5 yrs 6 mos
Current Experience

Wolt

4 roles

Staff Applied Scientist

Promoted

Apr 2025Present · 1 yr 2 mos

  • My work as a Staff Applied Data Scientist is focused on the routing and scheduling of deliveries and the related estimation. Also the matters of pricing need to be considered in the route optimisation. Working in the role includes coordinating bigger cross-team and cross-company projects. Also mentoring others and sharing knowledge and best practices comes with this role. The work combines data science, ML and software engineering in general. The combinatorial optimisation systems, which are making the routing decisions at Wolt, need to have ultra high availability. Any downtime would cause the whole company to have downtime.
Data ScienceMachine LearningRouting OptimizationSoftware Engineering

Engineering Team Lead

Nov 2024Mar 2025 · 4 mos

  • I worked as an interim engineering team lead in Wolt’s Logistics Assignments team from November 2024 until mid-March 2025 during the team lead's absence. The Logistics Assignments team is responsible for developing and maintaining the assignment engine at Wolt. The assignment engine plans the routes and matches the tasks to the courier partners. This is a critical part of the company’s software and it needs to run day and night and operate under heavy loads at all times.

Senior Applied Scientist

Oct 2023Oct 2024 · 1 yr

  • I have been working at Wolt's logistics domain since the beginning of the company's scale-up phase. The role has included many things and doing "what it takes" to make things work. I've been writing C++ code to the optimizer, done traffic modeling, setting up our switchback experimentation platform and practices, building CI/CD in Github Actions. Some more software engineering related tasks have been setting up monitoring and testing for the optimizer. This role has been combination between working as a backend engineer and a data scientist diving deep in both domains.
  • This is the same role as I had as the Logistics Optimization Researcher but transferred from the Engineering organization to the then newly founded (Applied) Data Science organization.
  • Some tasks:
  • Developing the in-house route optimizer (C++ programming)
  • Operations research
  • Data Science
  • Traffic modeling
  • Simulations
  • Developing switchback testing capabilities and conducting switchback tests
  • Building CI/CD pipelines in GHA
  • Doing any and all sorts of tasks related to the logistics domain
C++Traffic ModelingCI/CDData ScienceSoftware Engineering

Logistics Optimization Researcher

Sep 2020Sep 2023 · 3 yrs

  • I have been working at Wolt's logistics domain since the beginning of the company's scale-up phase. The role has included many things and doing "what it takes" to make things work. I've been writing C++ code to the optimizer, done traffic modeling, setting up our switchback experimentation platform and practices, building CI/CD in Github Actions. Some more software engineering related tasks have been setting up monitoring and testing for the optimizer. This role has been combination between working as a backend engineer and a data scientist diving deep in both domains.
  • Some tasks:
  • Developing the in-house route optimizer (C++ programming)
  • Operations research
  • Data Science
  • Traffic modeling
  • Simulations
  • Developing switchback testing capabilities and conducting switchback tests
  • Building CI/CD pipelines in GHA
  • Doing any and all sorts of tasks related to the logistics domain
C++Traffic ModelingCI/CDData ScienceSoftware Engineering

Vincit

Data Scientist

Aug 2018Sep 2020 · 2 yrs 1 mo · Helsinki

Aalto university

Doctoral Student

Oct 2014Jul 2018 · 3 yrs 9 mos · Helsinki Area, Finland

  • I did research in random search (Monte Carlo) methods for control optimization in virtual environments.

Vtt, adaptive radios

3 roles

Scientist

Jul 2014Oct 2014 · 3 mos

Master's thesis worker

Jun 2013Jun 2014 · 1 yr

  • I have been designing IPD (RFIC) circuits to the IPD process that is being developed at VTT the Technical Research Center of Finland. Besides my master's thesis I have been working in customer projects involving the European Space Agency, Finnish Defence Forces and various companies.

Research trainee

May 2012Dec 2012 · 7 mos · Espoo

  • On-wafer measurements
  • Antenna measurements
  • RF MEMS measurements
  • Automating the measurements
  • Matlab and SCPI programming
  • Processing of the measurement data

Aalto university

2 roles

Course assistant

Sep 2011May 2012 · 8 mos · Espoo

  • In this position I was responsible for teaching probability and statistics in demonstration sessions. The students of the course had done the assignments at home and the solutions were discussed in the demo sessions. I was also responsible for grading the exams and for providing model answers to them. The material of the course includes estimation theory, statistical testing, regression and fundamental probability theory.

Course assistant

Sep 2009May 2010 · 8 mos · Espoo

  • In this position I was responsible for teaching probability and statistics in demonstration sessions. The students of the course had done the assignments at home and the solutions were discussed in the demo sessions. I was also responsible for grading the exams and for providing model answers to them. The material of the course includes estimation theory, statistical testing, regression and fundamental probability theory.

Srv

Project Engineer Trainee

May 2010Jul 2010 · 2 mos · Helsinki

Srv

Project Engineer Trainee

May 2009Aug 2009 · 3 mos

Hartela

Construction Worker

May 2008Aug 2008 · 3 mos · Helsinki

Mcdonald's

Hamburger Assembler

Apr 2007Aug 2007 · 4 mos · Raisio

Hartela

Construction Worker

Jun 2006Jul 2006 · 1 mo · Raisio

Db schenker

Janitor

Jun 2004Jun 2004 · 0 mo · Turku

Education

Aalto University

Doctor of Science (Tech.) — Computer Science

Jan 2014Jan 2018

Aalto University

Master of Science (Tech.) with distinction

Jan 2012Jan 2014

Aalto University

Bachelor of Science (Tech.) with honours

Jan 2008Jan 2013

Aalto University

Civil Engineering

Jan 2007Jan 2008

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