
GreenIron H2 AB · Sweden
Are you at the start of your career and eager to gain hands-on experience developing groundbreaking technology while contribute to a more sustainable future? Gr...
Are you at the start of your career and eager to gain hands-on experience developing groundbreaking technology while contribute to
a more sustainable future? GreenIron has GreenIron is growing and is looking for a R&D Engineer with a strong technical interest
in metallurgy and process development. Join a team driving the green transition in the steel, mining, and process industries,
where you will gain hands-on experience, make a real impact, and help shape the future of sustainable industry.
As R&D Engineer you will have a key role in GreenIron’s R&D team. Your main focus will be to contribute with technical expertise
and drive the development of GreenIron’s recycling processes for the steel, mining, and process industries. You will act as a
technical link between R&D, production, technical sales, customers, and suppliers, contributing to successful projects and
efficient solutions. The position is based in Stockholm but involves travel on a weekly basis to operational sites (Sandviken and
Kumla). In this role, you will report to CTO Linda Ahl.
You will play a role in GreenIron’s technology scale up and development work. With your knowledge in process development and
material science, you will contribute to innovation and continuous improvements, while working closely with internal teams and
external partners to ensure effective projects and a sustainable, safe operation.
Responsibilities
post-processing stages
smooth operations and successful outcomes
methodologies
Your profile
We are looking for someone with a technical background, holding an engineering degree in materials science, engineering physics,
or a similar field, along with 0-3 years of experience in the steel, mining, or process industries. You combine deep technical
knowledge in metallurgy and process development with strong business acumen and the ability to create value for both the business
and its customers.
As a person, you are humble, analytical, and collaborative, with a strong ability to build long-term relationships. You are
curious, structured, and eager to share your knowledge while also being open to others’ perspectives. You thrive in a dynamic
environment where innovation and sustainability are at the core. You are fluent in both Swedish and English, and additional
language skills are considered an advantage.
What we can offer you
At GreenIron, you will be part of a pioneering team driving innovation in the metal and mining and industry. Our patented,
fossil-free technology has the potential to significantly reduce the global CO₂ emissions. By joining us, you will be part of a
growing team during our scale up phase and you will contribute to solving some of the world’s most pressing environmental
challenges, while developing your skills in an inclusive and dynamic workplace that values innovation, collaboration, and
sustainability. GreenIron as an employer offers terms and conditions in accordance with the Teknikavtalet* (the Swedish
Engineering Industries Agreement).
Please note that this is a fixed-term position until 31 May 2027, with the possibility of an extension. If this sounds like your
kind of challenge, apply today by submitting your CV and answer the questions when applying. We review applications on an ongoing
basis; however, due to the holiday season, our response times may be slightly longer than usual.
Please note that we are performing background checks as a final step in our process*.
If you have any questions regarding the process, please contact Axel Hillelson at axel.hillelson@greeniron.se
We are looking forward to your application!
The challenge Lithium-sulfur batteries promise up to five times the energy per weight of today's lithium-ion cells, but the polysulfide shuttle effect (and many other technical issues) has kept them out of commercial production. Until now. Pentalys Energy has developed precisely nanoengineered materials for separator and cathode that suppress this shuttle mechanism for thousands of cycles at 1C, enable rates up to 8C, and ensure safe operation. All based on abundant sulfur materials for cost-efficient and sustainable solutions. The materials work. Now we need to deliver them to the first customers, understand them deeper, and improve the first products. That is where you come in: as R&D Engineer, you will spend many of your days in the lab, synthesizing our cathode and separator materials and building the coin and pouch cells that show what our materials can do. What you'll do • Synthesize and refine our proprietary cathode and separator materials; running the chemistry hands-on, improving procedures, documenting and analysing results and procedures. • Build cells at both scales: coin cells for fast screening of materials and formulations, pouch cells for demonstrating real-world performance. • Test and characterize what you make, and connect the dots between synthesis parameters, material properties, and cell behaviour. • Work closely with the rest of the team, especially materials development lead, to decide what to try next. In an early-stage company, your results and input guide the direction. • Help keep a small lab running well: shared responsibility for equipment, chemicals, and safe working practices. What matters to us • **Mindset above all.**You want to make a difference by joining a start-up, and you act like it: you take ownership, ask why, solve problems, and don't wait to be handed a protocol. Early-stage means incomplete data, evolving specs, and wearing multiple hats. This excites you, since that means you can find new solutions. • Solid hands-on skills in chemical synthesis, cell building, or ideally both • At least two years of experience in battery R&D. Relevant PhD positions are counted as experience. • Careful, well-documented lab work. Nice to have, not required • Master's degree in chemistry, materials science, electrochemistry, or a related field. But what you do in the lab matters more. Strong candidates with a technician background and hands-on battery experience are encouraged to apply. • Experience with lithium-sulfur chemistry, sulfur cathodes, membrane or separator technology. • Glovebox or dry-room cell assembly experience, and pouch cell building in particular. • Electrochemical testing: cycling protocols, EIS, data handling. What we offer • Real ownership: genuine influence on both the technology and the direction of the company from an early stage. • A small, but dedicated team that have deep technical expertise and will work together with you to find solutions. • A front-row seat to pioneering next-generation battery materials that redefine energy storage and make impossible electrification possible. How to Apply Send your CV and a brief cover letter outlining your relevant track record and motivation to career@pentalys-energy.com before August 15, 2026.
About Ultralytics: At Ultralytics, we commit to relentless innovation in the AI space and seek team members who resonate with our ambition to produce the world's best YOLO AI models. If you're obsessed with AI, eager to make an impact on the world, and thrive in dynamic, high-intensity environments, we invite you to apply for a position on our team. ⚡ WHO WE ARE At Ultralytics, we're on a mission to simplify AI for everyone. As the creators of the world's leading open-source YOLO models and the popular Ultralytics GitHub repository, we empower millions of developers, researchers, and companies worldwide to build state-of-the-art computer vision applications. Following our $30M Series A round, we're expanding rapidly across our global hubs in London, Madrid, and Shenzhen. This is an opportunity to join a fast-scaling, high-performance team that's redefining the future of vision AI — where ambition meets impact, and ideas become reality. We move fast. We build boldly. We execute with purpose. And we do it together. 💼 ABOUT THE ROLE As an R&D Engineer focused on neural network architectures for YOLO, you'll design and develop the neural network architectures at the core of how YOLO is built. Your work will directly shape the open-source models used by millions of developers across detection, segmentation, pose, and emerging vision tasks. You'll operate at the intersection of research and production, turning ideas from papers into performant architectures, rigorous experiments, and production-ready model designs. Working closely with our cross-disciplinary R&D team, you'll help define future releases across the Ultralytics ecosystem and contribute to the technical foundations documented in our docs and guides. This role is ideal for a hands-on researcher who thrives on first-principles thinking, rapid experimentation, and high ownership. You bring deep architectural intuition, strong PyTorch skills, and the drive to build original models that advance the state of the art. 🚀 WHAT YOU'LL DO RESEARCH & ARCHITECTURE DESIGN * Research, design, and build novel neural network architectures for next-generation YOLO models. * Develop core components including backbones, necks, heads, attention modules, and efficient building blocks. * Read, reproduce, and extend cutting-edge papers into working model architectures from scratch. EXPERIMENTATION & OPTIMIZATION * Run rigorous ablation studies and large-scale architecture experiments across standard benchmarks. * Improve accuracy, latency, and scaling through distillation, pruning, and quantization-aware design. * Build training recipes and evaluation pipelines for detection, segmentation, pose, and new vision tasks. COLLABORATION & OWNERSHIP * Partner with R&D and engineering teams to turn research ideas into production-ready open-source models. * Contribute to foundational model initiatives that support future YOLO and broader vision systems. * Take ownership of assigned R&D tasks beyond architecture work and solve problems efficiently and correctly. 🧠 SKILLS AND EXPERIENCE CORE REQUIREMENTS * 5+ years of hands-on experience in computer vision and deep learning with architecture design expertise. * Proven success building models from the ground up, not just fine-tuning pretrained checkpoints. * Expert-level Python and deep proficiency in PyTorch, including custom layers, modules, and training loops. * Strong command of convolutions, attention, normalization, optimization, and loss design fundamentals. * Ability to read a research paper and implement it faithfully and efficiently from scratch. * Experience with efficiency research such as quantization, pruning, distillation, or neural architecture search. * Strong portfolio of research contributions through papers, preprints, open-source code, or original model work. * High ownership, adaptability, and comfort operating in a fast-moving research environment. NICE TO HAVE * Published research at venues such as CVPR, ICCV, ECCV, NeurIPS, or ICLR. * Experience with distributed training, mixed precision, CUDA profiling, or model deployment constraints. * Active open-source presence with architecture-focused repositories and meaningful community adoption. * Familiarity with the Ultralytics Python package, documentation, or community forum. * History of taking original research from prototype to models others actually use. 🌟 CULTURAL FIT At Ultralytics, we set bold goals and execute with speed, precision, and teamwork. We're driven by hard work, ambition, and resilience — building fast, learning constantly, and delivering measurable impact. You'll thrive here if you: * Take ownership and deliver results with focus and accountability. * Combine deep technical thinking with hands-on execution. * Value excellence, grit, and creativity in equal measure. * See collaboration as the foundation for meaningful progress. Our culture is built around our core values: * Relentless progress: Constant evolution and improvement. * Strive for excellence: Perseverance and attention to detail. * Actions, not words: Focus on delivering meaningful results. * Act with urgency: Seize fleeting opportunities. * Open access to all: Transparent communication and collaboration. Learn more in our Ultralytics Handbook and Mission & Values. 💰 COMPENSATION AND BENEFITS We reward excellence and impact — not just tenure or title. * Competitive salary: Reflecting your experience and contribution. * Equity packages: We want our success to be yours too. * Global collaboration: Work with passionate builders across our global team. * Flexible working hours: We value results over routines. * Generous time off: 24 vacation days, your birthday off, plus local holidays. * Tech & tools: Work on cutting-edge AI projects that power millions of devices. * Gear: Brand-new Apple MacBook Air/Pro, Apple Studio Display, and AirPods Pro 3. * Learning & development: Dedicated budget for personal and professional growth. * High impact: Your work will shape the future of vision AI. 🌎 WHERE AND HOW YOU CAN WORK This is a remote role. 👉 Check out ultralytics.com/careers for more about our culture, values, and teams. What we offer: Cutting-Edge, Next-Generation AI Computer Vision Technology: Contribute to building cutting-edge computer vision AI models based on the YOLO framework. Impactful Work: Shape the future of AI-powered solutions that transform industries. Collaborative Culture: Join a talented and passionate team that values open communication and innovation. Ultralytics Handbook Comprehensive guide to our company's mission, vision, values, and operational practices. This handbook is designed to provide key insights and resources for our (future) team members, collaborators, and community to align with Ultralytics' core principles. Link: https://handbook.ultralytics.com/ Ultralytics is an equal opportunity employer committed to building an inclusive workplace. We believe that everyone should be able to bring their whole selves to work, and we do not discriminate on the basis of race, religion, national origin, gender, sexual orientation, age, veteran status, disability, or any other legally protected status.
About the company A specialist in identity, secure transactions, and digital services, IN Groupe is the global leader in secure identity and trust services. Every day, our 4,000 employees across 40 countries work to ensure that everyone has access to a reliable and secure identity, both in the physical and digital worlds. With our solutions and our international network of 10 R&D centers, we support governments and businesses in more than 130 countries. Joining IN Groupe means helping to shape the future of the identity and secure transaction market. Become part of our international teams — driven by innovation and proud to design solutions that make life easier and protect personal data for millions of people around the world. Location Rousset, Provence-Alpes-Côte d'Azur, France Main Responsibilities * Manage new product introduction projects within a team of 7, from pre-study through to industrialisation and production line monitoring * Contribute materials expertise to the technical design of microsystem assemblies and help define new technologies * Support operational teams on processes and raw materials, and maintain interfaces with cross-functional departments * Monitor industry developments and maintain an up-to-date view of trends and opportunities in your field * Coordinate with internal teams, suppliers and external partners in line with confidentiality requirements * Contribute to the drafting and completion of technical documentation Required Profile * Engineering degree in materials, physics, industrial process engineering or mechanical engineering * Skills in polymer materials; knowledge of micromodule assembly, electronic documents or biometric identification is a plus * Proficiency in MS Project, basic AutoCAD, statistical tools and design of experiments (Statgraphics or equivalent) * English at CEFR B2 / TOEIC 785 level Who You Are * Clear and concise communicator * Rigorous, proactive and autonomous * A team player with visible energy and commitment