From the list below you can familiarize yourself with some examples of the variety of our summer trainee positions. Please note that these examples represent only some of the available positions, and many teams have multiple vacancies. Some new examples might be still added during December 2025.
In case you get invited to a job interview, the hiring manager will provide you with details of the specific position they have in their team. Make sure to fill in your application carefully, so that we can match you with suitable positions.
From automation and field service to software, simulation, design, and advanced research, these trainee roles offer hands-on learning, mentorship from experts, and a chance to make an impact on sustainable future.
Explore the examples below and find the path that fits your skills and curiosity. Please note that these examples represent only some of the available positions, and several teams have multiple vacancies.
Fuel Laboratory: This trainee role focuses on laboratory work related to new sustainable fuels, including testing and analysis. The team is looking for someone with with chemistry or engineering knowledge.
Materials & Tribology: Conduct material investigations and and support the team in tribology testing activities.
Thermofluids & Simulations: Dive into CFD simulations or software development to model and optimize fluid and thermal performance using tools like OpenFOAM and C++.
Test Slot Planning: Support RPA creation and software development to improve test slot planning workflows. You’ll work with tools such as Power BI and Polarion.
Design to Value: Join the team to work with software development of digital cost engineering tools and AI development using Databricks.
Tools & Controls Research: Develop embedded control systems and related tools for Wärtsilä engines. You’ll implement and test embedded software and validate performance.
Advanced Concepts: Seeking for trainees to perform mechanical assembly and disassembly of test parts to experimental rigs and GT power simulations for performance evaluations. The tasks also include design of test equipment and test setups and analyzing test results using tools like CAD, Excel, Matlab, and Python.
Plant & Cell Electrical: Support our electrical engineers with simple installations and test setups in plant and cell environments. You’ll help prepare test rigs and document results.
Testing & Validation: Gain practical laboratory experience by assisting with engine testing activities. You’ll support in setting up tests, running measurements, and recording data.
Plant Automation: Seeking for a trainee with skills in electrical automation. You’ll work on testing advanced plant automation systems that ensure efficient and reliable energy solutions.
Plant Automation & Controls: Support the team in various technical matters with automation and programming tasks that improve engine power plant performance.
Global Field Service: Join our field service experts to support electrical and automation tasks in customer plants and onboard projects. You’ll work with commissioning, troubleshooting, and maintenance activities.
Additive Manufacturing: Dive into advanced manufacturing in our Sustainable Technology Hub. Operate 3D printers, develop and test prototypes, and explore new concepts for factory and R&D needs.
Design Management: Contribute to mechanical design tasks using NX. Practical experience from plate welding, machining, or vehicle mechanics is seen as a benefit.
Tools & Equipment: Seeking a trainee to join the Global Planning team in Sustainable Technology Hub to assist with product and tool design tasks and development activities.
Catalyst Product Management: Perform process calculations for air and liquid systems, create piping and instrumentation diagrams, and select and test process components. The team is looking for a trainee with process design or engineering skills.
EU Project Management: Assist global teams in implementing energy storage solutions that enable renewable energy. Tasks include scheduling, planning, and supporting projects with electrical grid knowledge.
Site Management & Commissioning: Support energy storage projects by assisting with global mobility and data compliance in office-based roles or contributing to site management and electrical commissioning on-site.
Project Quality Assurance: Energy's QEHS organization is looking for a trainee to support with quality documentation and commissioning activities. The role includes creating quality plans for a variety of projects.
Project Management: Marine's Customer Delivery organization is seeking for project engineer trainees to support in project management tasks and engineering activities.
Global Field Services: Learn the essentials of field service with hands-on mechanical overhauls and travel-based assignments. You’ll assist with inspections, disassembly/assembly, and maintenance tasks.
Supplier Quality Assurance: Support Marine's Materials Management organization in quality notification handling.
Operations Management: Enable data-driven operations by supporting citizen development, BI dashboard lifecycle management, CRM reporting, and RPA development using UiPath.
Exciting opportunities for a career in digital technologies, software development, data analytics and cyber security. Our summer trainee positions offer hands-on experience in cutting-edge projects, mentorship from industry experts, and a chance to make an impact in a global organization. Whether you’re passionate about AI, data science, software engineering, or visual design, there’s a role for you.
Explore the examples below and find the ones that match your skills and curiosity. Please note that these examples represent only some of the available positions, and several teams have multiple vacancies.
AI Centre of Excellence: Join our AI professionals to explore and develop innovative machine learning solutions. This position is deal for candidates with a foundation in data science and machine learning who are eager to apply their knowledge in real-world projects.
Customer Success & Services: Research GenAI agent capabilities, develop agent pilot solutions to boost productivity, and share your findings with the team.
Cyber Operations: Dive into the world of cyber security and emerging digital technologies. This role involves analyzing data, conducting research, and providing recommendations to strengthen our cyber resilience.
Data & Reporting: Develop data pipelines and support our data platform using Python, Pandas, SQL, AWS, and Databricks. You'll get to work alongside experienced engineers to ensure robust data solutions.
Engineering Services: If you have full-stack development skills and an interest in AI and automation, this role is for you. Act as a Scrum Master for development backlogs while driving AI and process automation initiatives.
Master Data: Ensure accuracy and reliability of business-critical SAP Master Data. This role is perfect for those interested in data handling and IT systems.
People Analytics: Combine your data skills with HR insights! Help analyze HR data using Python and data analytics tools to enable data-driven decision-making.
Platform Engineering and Developer Services: Support in DevOps activities or work on software development. Skills in coding, agile practices, and CI/CD pipelines are beneficial.
Product Excellence: Bring your creativity to life! Use graphical design skills and visual design software to create engaging visual assets for Wärtsilä software products.
Sales Development: seeking for a trainee with programming skills, preferably in React, Python, or JavaScript. The role involves developing and maintaining sales applications.
Information to be updated soon!
Gain hands-on experience in global operations, procurement, transportation, and sales development. As a trainee, you’ll work alongside industry experts, contribute to real projects, and develop skills that will shape your future.
Explore the examples below and find the ones that match your skills and curiosity. Please note that these examples represent only some of the available positions, and several teams have multiple vacancies.
Indirect Procurement: Work on strategic purchasing and sourcing activities. We’re looking for a proactive trainee with sourcing experience and excellent collaboration skills.
Project Purchasing & Documentation: Assist with purchasing-related tasks and documentation for Marine projects.
Proposal Management: Join our Proposal Management team to support sales by preparing technical and commercial offers. Ideal position for candidates with strong analytical and teamwork skills.
Procurement & Logistics: Seeking for a proactive trainee with knowledge of international business. Your tasks include assisting with invoicing, logistics, and procurement activities in an international business environment.
Procurement team: The trainee will work on purchasing, order follow-up, invoice handling, problem-solving and negotiations. SAP skills and a self-driven attitude are valued.
Requisition to Pay Process: Support supplier portal user management and purchase-to-pay process tasks.
Sales Management and Proposals: Create calculations and offers for long-term service agreements and support front-end sales with technical inquiries. Strong Excel skills are essential.
Sales Proposals Nordics: Prepare service offers, solve technical problems, and potentially join onboard jobs (subject to safety requirements).
Technical Management: Seeking a detail-oriented trainee to assist with product management tasks, including documentation and supporting delivery projects in Marine's Product Management & Sales Support team.
Technical Sales Support: Contribute to civil cost estimation software development, prepare cost estimates, and assist civil sales activities. Knowledge in civil engineering is required.
Commissioning Management: Support spare part handling for marine new build projects.
Customer Assistance Warranty Services: Handle warranty claims and act as a stand-in for Warranty Experts during summer vacation periods.
Delivery Coordination: Ensure correct transportation and customs documentation and plan deliveries for spare parts globally.
Global Lead Management: Support global operations with lead management activities, analyze data, and assist in process improvements.
Transportations: Handle transportation and shipping tasks, including export documentation, customs clearance, and heavy transport coordination.
Order Intake & Planning: Assist with production planning tasks and contribute to efficient order handling.
Project Logistics: Book transports to customer shipyards globally and support logistics coordination.
Our Strategy & Business Development summer trainee positions offer a unique chance to work on projects that drive innovation, continuous improvement and strategic growth. Whether your interests lie in project management, data analytics, compliance, or business development, you’ll get to collaborate with our experts and contribute to meaningful initiatives that make an impact.
Explore the examples below and find the ones that match your skills and curiosity. Please note that these examples represent only some of the available positions, and several teams have multiple vacancies.
Business Performance Development: Be part of a team driving operational improvements through automation and AI. You’ll help define business use cases for AI, support RPA development, and manage reporting and documentation.
Competence Development: Support system-based activities and contribute to improving training programs and competence development initiatives.
Continuous Improvement and Planning: Co-facilitate workshops, conduct surveys, and maintain data quality to support continuous improvement initiatives. This role is for someone who enjoys collaboration and process optimization.
Development and Compliance: Work with process development and compliance monitoring in Energy Storage Solutions. This role is ideal for someone independent, detail-oriented and interested in ensuring operational excellence.
Next Business Lab: Seeking for a trainee with project management experience and technical aptitude. The role involves supporting R&D and innovation projects by structuring tasks, collaborating with different teams across the organization, and documenting ideas systematically.
Offering Development: Assist in business development projects and communication activities that shape our product and service offerings.
Project Planning and Development: Assist with project management tools, develop Power BI reports, and support Marine's product development activities.
We offer positions both in Wärtsilä Global Business Services (WGBS) and across our business units, giving you a chance to experience diverse aspects of financial operations in a global field. As a trainee, you’ll work alongside experienced professionals, gain valuable insights into treasury, controlling, invoicing, and compliance, and contribute to real projects that make an impact worldwide.
Explore the variety of roles below and find the ones that match your interests and skills! Please note that these examples represent only some of the available positions, and several teams have multiple vacancies.
Corporate Treasury: Join the Corporate Treasury team and assist with trade finance activities. Your tasks will include processing bank and parent company guarantee applications and supporting in related administrative duties.
Cash Management: Support the Cash Management team in treasury operations and payment processes. You’ll work on liquidity management and help ensure smooth cash flow within the payments center.
Trade Finance: As a trainee in the Trade Finance team you'll support in daily tasks related to foreign exchange hedging and bank guarantee applications. You’ll also monitor incoming payments and process guarantee commission invoices.
Accounts Payable (WGBS): Be part of our WGBS team handling purchase invoices. You’ll manage invoice reception, booking, and process flow. As you gain experience, your responsibilities will expand to reconciliations and bookkeeping support.
Travel Expenses (WGBS): The team is seeking a detail-oriented trainee with a positive mindset. The role involves reviewing travel and expense reports and ensuring compliance with company policies.
Energy, Invoicing: Work with our Invoicing & Export Documentation team to manage invoicing and coordinate export documentation for Energy’s New Build and Upgrades projects worldwide.
Marine, Project Control: Join our Project Control & Operative Controlling team to assist with controlling tasks for Marine customer delivery projects.
Energy Storage, Project Control: The team is looking for two trainees with different roles. One to support project management activities alongside project controllers, and another to handle invoicing and import/export documentation for international trade.
These roles offer hands-on experience in areas such as marketing campaigns, social media, employer branding, and HR operations — all within a global and international working environment. As a trainee, you’ll collaborate with skilled professionals, contribute to impactful projects, and develop your expertise in communication and people-related processes.
Please note that these examples represent only some of the available positions. Check out the examples below and find the the ones that match your skills and curiosity!
People Support Hub: Become part of our People Support Hub team and assist with HR processes such as document archiving, onboarding and offboarding activities, and other ad hoc tasks. This role is ideal for someone detail-oriented and organized.
Employer Branding: Support our local HR team in Finland with employer branding activities. Tasks include planning and organizing events and creating engaging content for our WärtsiläVoice Instagram account.
Marketing & Communications: Join the team and explore the world of Energy business. This position has a variety of tasks, including press releases, PR and media work, digital campaigns, social media management, event coordination, and creating marketing assets.