Heat Transfer Application Specialist

Aira Group AB

10% of Europe’s CO₂ emissions are caused by residential heating, and energy bills are out of control. Aira is here to change that. With our intelligent Aira Heat Pump at the heart, we’re making the switch to clean energy-tech easier and more affordable. Helping Europe turn off gas and slashing energy costs one home at a time. Founded in 2022 and with 1200+ employees and counting, Aira is driving the clean energy revolution by providing homes with modern clean energy-tech solutions such as solar power, battery storage solutions, and heat pumps. With a state-of-the-art production facility in Poland, and HQ in Stockholm, Sweden, and hubs across the UK, Germany and Italy, Aira is well on track to install clean energy-tech into 5 million homes by 2034. About the role  We are now looking for a Mechanical Design Engineer to join us on our journey to shape the future of clean energy. In this role, you won't just design – you’ll help drive innovation at the core of Aira’s next-generation heat pump technology. As part of our fast-scaling team, you’ll influence how we work, accelerate product development, and bring bold ideas to life. Your contributions will directly impact both our team’s growth and the products we create – products that will transform how people heat and power their homes. By joining us, you’ll play an essential role in our mission to make sustainable living accessible to millions and create real, positive change for the planet. What you’ll be doing As a Mechanical Design Engineer, you will be at the heart of developing the next generation of Aira’s intelligent heat pumps and home energy systems. Your work will span the full development cycle – from concept to detailed design, testing, verification, and preparation for manufacturing – giving you the opportunity to make a direct impact on how our products take shape and reach the market. You’ll design and develop cutting-edge mechanical solutions, with a strong focus on robust design and innovation while balancing the final performance, product size, and costs. Beyond design work, you will influence our ways of working and the technologies we choose, playing a pivotal role in shaping Aira’s future product portfolio. This is not just about engineering excellence – it’s about driving innovation that enables sustainable living for millions of households. By joining us, you’ll help turn bold ideas into tangible solutions that make a real difference for both people and the planet. Your key responsibilities will include: Designing and developing mechanical parts and assemblies, Bills of Materials and component selections tailored for high-performance heat pump systems and its accessories. Creating detailed technical documentation, including 3D models and 2D drawings (experience with PLM tools and SolidWorks is highly valued). Actively contributing to project meetings and reporting progress to product management, ensuring accurate planning, follow-up, and monitoring of all activities within the designated area. Collaborating closely with cross-functional engineering teams to ensure compliance with customer needs, regulatory standards, and the overall product vision and requirements. Exploring and integrating innovative materials and tooling methods, for example within plastics and sheet metals, to enhance product quality, sustainability, and long-term reliability. Designing enclosures for electronics, such as PCBAs and/or similar, by plastic injection molding and/or sheet metal. Working closely with industrial design, taking over A-surfaces, and realizing the CMF specifications. Collaborating with main suppliers and development partners. What you’ll bring to the role Solid experience in mechanical design or relevant technical fields, such as product development and mechanical engineering. B.Sc. in Mechanical Engineering or M.S. in Mechanical Engineering, Design & Product Development, or equivalent. Experience working with 3D tools for designing mechanical components in a 3D environment; SolidWorks proficiency is advantageous. Experience in consumer products involving electronics and embedded software. Experience in testing, reliability, and qualification of systems, either in-house or on the partner side. Proven track record in transitioning designs into mass production, ensuring rigorous quality control and reliability standards. Experience working in the conceptual phase, physical prototyping, hands-on testing, and sustainability. Experience working closely with industrial designers. Proficiency with tools such as PowerPoint or Adobe and the ability to present ideas to both technical and non-technical audiences. An open mindset and a passion for working in a start-up environment with a strong ambition to scale quickly. What is in it for you? Gain hands-on experience in a fast-growing scale-up, with a supportive and inclusive culture, and career advancement opportunities. Collaborate with diverse teams across international markets and launch products globally. Develop and grow personally and professionally in an entrepreneurial-minded environment. Thrive in a dynamic, solution-oriented culture, tackling challenges and driving meaningful solutions that make a positive impact on the world. Influence the company's success, with a visible impact on product development and market growth. Enjoy our brand-new R&D Center located at Berga, Helsingborg. At Aira, we champion next-generation energy as well as diversity and inclusion. We firmly believe that a diverse workforce fosters innovation and creativity, enhancing our ability to serve customers and communities effectively. We welcome individuals from all backgrounds, cultures, and perspectives to join our team. Our commitment is to uphold equality and inclusivity, fostering a collaborative environment where everyone can thrive and contribute to a better future for our people and the planet.

QVANTUM ENERGI AKTIEBOLAG

Industrial Engineer Project Leader We are a group of people who think differently, have a passion for entrepreneurship and strive to maintain a flat organization where we all are expected to make a difference. We believe in making the impossible possible together – by building on each individual's personal strengths. Our goal is to change the way cities in Europe are heated and cooled, do you want to shape the future with us? Our world is in the midst of an energy transition from fossil fuels to renewable energy sources. At Qvantum, we have developed a solution to tackle a difficult challenge that no one has been able to solve before – how to enable the many people in the big cities to live a life without dependence on fossil fuels for heating and cooling at an affordable price. We have developed a wide range of smart heat pump solutions built on modern software. The products are suitable for everything from small apartments to large property complexes and entire residential blocks. The next generation of heat pumps are not only very energy efficient but also designed to be an active node in the electrical grid. Qvantum has developed a series of new capabilities for this purpose including our heat pump to grid (HP2G), flexready®, thermal battery and digital doctor features. We are currently more than 350 colleagues, located in 8 different countries, and we continue to grow at a rapid pace. With factories in Sweden and Hungary, multiple R&D centres and world class specialist competencies in heat pump hardware & software development, energy systems and industrialization we are aiming to become one of the leading players in our segment in Europe. We invite you to an exciting company building journey filled with development opportunities and an inclusive work environment that encourages professional and personal development together with dynamic and forward-thinking colleagues! Join Us! About the role We are seeking a driven and innovative Industrial Engineer to join our rapidly scaling heat pump manufacturing operations. As we expand towards producing 50,000 units annually, you will play a pivotal role in optimizing production processes, integrating advanced manufacturing systems, and driving continuous improvement initiatives. You will work cross-functionally to ensure efficient, cost-effective, and high-quality production as we transition from scale-up to large-scale manufacturing. Key Responsibilities Analyze, design, and optimize manufacturing workflows and production layouts to support scale-up goals. Implement lean manufacturing principles to eliminate waste, reduce cycle time, and improve throughput. Collaborate with production, R&D, and supply chain teams to introduce new product lines and production technologies. Lead time studies, capacity planning, and equipment utilization analysis. Support automation projects, including robotics and Industry 4.0 integration. Develop standard operating procedures (SOPs), work instructions, and training documentation for production staff. Conduct root cause analyses and implement corrective actions to resolve production bottlenecks or quality issues. Contribute to sustainability initiatives by optimizing energy usage and minimizing material waste in production processes. Supervise equipment development phases with suppliers, manage local & international suppliers through all phases of projects (FMEA, RFI, RFQ, FAT-Pre acceptance, SAT-Final acceptance etc.) Perform the manufacturability analysis of New Products, process and technologies Qualifications Bachelor’s or Master’s degree in Industrial Engineering, Mechanical Engineering, or a related field. 5+ years of experience in industrial or process engineering (within high-volyme manufacturing environment is positive) Proven knowledge of lean manufacturing, Six Sigma, or similar methodologies. Experience with CAD software, production simulation tools, and data analysis (e.g., Power BI, Excel, Python, SCADA). Strong understanding of automation, supply chain interactions, and production systems. Preferred Experience: Background in HVAC, home energy systems Experience with ERP and MES systems (e.g., SAP, Siemens Opcenter). Exposure to working in a scale-up or fast-growing production environment. Fluent in English; Swedish is a plus.

APR Technologies AB

APR Technologies is a Swedish deep tech company developing high-performance liquid cooling solutions for data centers, space, defense, telecom, and battery applications. Our core technology Rheion™, co-developed with NASA, ESA, and Airbus, controls and redirects cooling liquid flow at chip scale, removing thermal barriers to technological progress while saving energy and enabling higher compute density. We are now looking for a Fluid & Coolant Specialist to join our R&D team in Enköping, Sweden. The role In this role you will design and test fluid handling systems and components, focusing on thermal performance, flow, pressure, and materials compatibility. Key responsibilities: • Evaluate and select fluids/coolants based on thermal, hydraulic, electrical, chemical, environmental, and reliability requirements. • Continuously monitor the market for existing and emerging coolant technologies. • Characterize and assess fluid properties including viscosity, density, thermal conductivity, specific heat capacity, dielectric strength, vapor pressure, and electrical conductivity. • Define qualification methodologies and perform verification testing of new fluids. • Define and execute material compatibility testing with metals, polymers, elastomers, adhesives, coatings, and electronic materials. • Investigate coolant ageing, contamination, corrosion mechanisms, and degradation effects throughout product lifetime. • Define and perform electrohydrodynamic pumping performance testing for new fluids. • Support mechanical and electrical engineering teams in material selection and fluid-related design decisions. • Maintain and continuously develop a database of fluid properties, compatibility data, and test results. • Assess environmental, health, safety, and regulatory aspects of coolant candidates, including sustainability and recyclability considerations. • Participate in design reviews and contribute to engineering decisions related to cooling technologies, fluid selection, and system reliability. • Collaborate across engineering disciplines to ensure integrated product performance. Required qualifications: • Degree in Chemical Engineering, Thermal Engineering, Chemistry, Materials Engineering, or equivalent. • Knowledge of coolant chemistry, electrochemistry, thermophysical fluid properties, and material compatibility. • Understanding of liquid cooling systems, and heat transfer relevant parameters. • Experience in experimental testing and data analysis. • Strong analytical, communication, and documentation skills. • Fluent in English. Meriting qualifications: • Experience with dielectric fluids, liquid cooling, or molecular pumping technologies. • Experience in coolant qualifications, reliability testing, or material compatibility assessments. • Hands-on experience with pumps, flow systems, and instrumentation. Application Send your CV and cover letter to careers@aprtec.com by 31 July 2026.