Renasens AB jobb

About us At Renasens we're building for people who are energized by winning, enjoy ownership, and thrive in a fast-moving environment. Our pace demands individuals who hold themselves to a high standard and care deeply about execution. If you prefer extensive structure, highly predictable environments, or a slower pace of decision-making, we may not be the right fit. In a small team, there's nowhere to hide, in both directions. Great work gets noticed, and so do opportunities to improve. The upside is that your impact is visible, your contributions matter, and strong performance is recognized quickly. Before applying, take a moment to consider whether this environment aligns with how you do your best work. Your mission at Renasens You see a fiber and instinctively think about what functional groups are sitting on its surface; and what you could do with them. You will bring a methodical mindset and a strong synthetic toolkit to design and execute functionalization chemistry that gives our recycled fibers new performance characteristics. You move between molecular design and hands-on lab work fluently, and you turn ideas into reproducible protocols that survive contact with the pilot. Take end to end ownership of the fiber functionalization workstream (cotton and polycotton) Design and execute grafting, crosslinking, and surface modification chemistry to meet specific performance targets Develop and optimize reaction protocols from lab bench toward pilot-relevant conditions Characterize functionalized fibers using relevant techniquesWrite clean SOPs and contribute to IP generation through structured experimental records Contribute to an organized and clean lab environment What you bring MSc or PhD in organic chemistry, polymer chemistry, or related field Strong fundamentals in functional group chemistry, reactivity, and reaction mechanisms Experience with grafting, crosslinking, or surface functionalization of polymers or natural fibers Minimum 2 years of industrial R&D experience (chemical, materials, polymer, or textile industry), academic only profiles will not be considered for this role Hands on synthetic lab experience; comfortable designing reactions and troubleshooting when they fail Solid analytical/characterization skills Who you are Energized by problems; yours, your colleagues' and the ones nobody asked you to solve yet. You don't walk past a challenge, you walk toward it Reliable & Independent: you take ownership of your chemistry and deliver on time without close supervisionTeam over ego; you care more about collective wins than being right Thrive in fast paced environments; You are energized by ambitious timelines and meaningful challenges Translate depth into action, you go deep on reaction mechanisms when needed, but don't get stuck there. You know when to stop optimizing the synthesis and start scaling it. Great to have but not required Exposure to organic chemistry applied to subcritical or supercritical fluid systems Previous experience in textile, fiber, or cellulose chemistry Experience working at the interface of organic chemistry and process scale-up Track record of contribution to patents or IP How we work at Renasens Onsite & hands-on: our pilot plant is in Borås, with our headquarters in Stockholm. This role is based where the work happens; close to the lab and the pilot. Expect to spend most of your time on site running reactions and iterating with the team. Small team, high ownership: we are around 10 people. You will own your workstream end-to-end and work directly with the R&D lead, process engineers & CEO. No layers, no committees. Pace matters: We have pilot reception milestones in 2026 and customer commitments behind them. We move fast, decide with the data we have, and iterate. Compensation & benefits Wellness allowance Pension scheme 30 days vacation Rapid career growth Employment type Full-time Location Borås, Viared

About us At Renasens we're building for people who are energized by winning, enjoy ownership, and thrive in a fast-moving environment. Our pace demands individuals who hold themselves to a high standard and care deeply about execution. If you prefer extensive structure, highly predictable environments, or a slower pace of decision-making, we may not be the right fit. In a small team, there's nowhere to hide—in both directions. Great work gets noticed, and so do opportunities to improve. The upside is that your impact is visible, your contributions matter, and strong performance is recognized quickly. Before applying, take a moment to consider whether this environment aligns with how you do your best work. Your mission at Renasens You see a chemical process and instinctively want to understand it in detail; not just whether it works, but why. You will bring a methodical mindset and real attention to detail, taking full ownership of the cotton pre-treatment and dye removal workstream. You are comfortable designing experiments from first principles, running them rigorously, and turning data into decisions that move the process forward. Take end-to-end ownership of the cotton pre-treatment and dye removal development Design, run, and iterate on lab scale experiments from bench to pilot relevant conditionsIndependently execute a full suite of characterization techniques To be able to work in a team, receiving feedback and improving the process Process, analyze, and report data with the rigor needed for scale up decisions Refine experimental protocols and SOPs to ensure consistent, high-quality results Contribute to an organized and clean lab environment What you bring MSc or PhD in physical chemistry, chemical engineering, or related field; we particularly value candidates who combine fundamental understanding of dye-fiber chemistry with hands on process development experience. Industry experience is required Understanding of the fundamentals in solvation thermodynamics, adsorption/desorption equilibria, kinetics, and mass transport is a merit. Experience with cellulose, dyes, polymers, or extraction processes is an advantage; bonus if it touches supercritical fluids or alternative solvents Hands on lab experience; comfort moving between bench work and process thinking Experimental design skills Who you are Energized by problems; yours, your colleagues' and the ones nobody asked you to solve yet. You don't walk past a challenge, you walk toward it. Reliable & Independent: you take ownership and deliver on time without needing close supervision Team over ego: you care more about collective wins than being right Thrive in fast paced environments: you are energized by ambitious timelines and meaningful challenges Translate depth into action, you go deep on mechanism when needed, but don't get stuck there. You know when to stop characterizing and start deciding. Great to have, but not required Experience with industrial dyeing chemistry Previous experience in textile, fiber, or cellulose-based recycling processes Sub-critical or supercritical experience Experience translating lab results into pilot-scale process design How we work at Renasens Onsite & hands on: Our pilot plant is in Borås, with our headquarters in Stockholm. This role is based where the work happens; close to the lab and the pilot, not behind a laptop. Expect to spend most of your time on site running experiments and iterating with the team. Small team, high ownership: We are around 10 people. You will own your workstream end-to-end and work directly with the R&D lead, process engineers and CEO. No layers, no committees. Pace matters: We have pilot reception milestones in 2026 and customer commitments behind them. We move fast, decide with the data we have, and iterate. Compensation & benefits Wellness allowance Pension scheme 30 days vacation Rapid career growth Employment type Full-time Location Borås, Viared

What we are looking for Are you a highly-organised and safety-minded professional who takes pride in keeping a lab running like clockwork? Do you enjoy the mix of hands-on analytical work and the discipline of maintaining equipment, protocols, and a safe working environment? Are you someone who can juggle multiple priorities, support a fast-moving R&D team, and consistently deliver reliable, high-quality data? If so, we would love to hear from you. Join us in scaling a groundbreaking technology that is transforming the future of textile recycling. Your mission at Renasens You see a lab not just as a workspace, but as a system that needs to run safely, cleanly, and reliably for the science to happen. You will take ownership of day-to-day lab operations, safety, equipment, and organization, while also rolling up your sleeves to run and support the analyses that drive our R&D decisions, from dye removal characterization to fiber mechanical testing. Own lab safety end-to-end: ensure protocols, PPE use, chemical handling, storage, and waste disposal meet regulatory and internal standards Maintain, calibrate, and troubleshoot lab equipment including analytical and mechanical instruments, coordinating servicing and repairs as needed Assist the R&D team in running analyses supporting treatment & dye removal development, including TGA, spectrophotometry and chromatography Run and support mechanical characterization of fibers, including tensile strength, bursting strength, fiber length and spinnability Manage lab consumables, inventory, and equipment logs to keep experiments running without interruption Develop and maintain SOPs for equipment use, safety procedures, and testing protocols Keep the lab organized, clean, and audit-ready at all times Work closely with technicians and process engineers, flagging equipment or safety issues before they become blockers What you bring BSc or MSc in chemistry, materials science, textile engineering, or a related field. Industry or lab-operations experience is a strong plus. Hands-on experience with analytical lab equipment (TGA, spectrophotometry, XRD, or similar) and mechanical testing equipment (tensile strength, bursting strength & fiber length testers) Ownership of lab safety practices, chemical handling, and regulatory requirements Who you are Safety-first: you don't cut corners, and you make sure others don't either Reliable and independent: you take ownership of the lab's day-to-day and deliver without needing close supervision Detail-oriented: you notice when something's slightly off with equipment or data before it becomes a bigger problem Team over ego: you're there to support the wider R&D effort, not just your own tasks Comfortable switching between hands-on lab work, equipment troubleshooting, and administrative upkeep (logs, SOPs, inventory) Thrive in a fast-paced environment, energized by ambitious timelines and a growing lab Great to have, but not required Experience with dye-fiber chemistry or textile recycling processes Experience with mechanical testing standards for textiles/fibers Prior experience setting up or managing a lab from an early stage startup How we work at Renasens Onsite & hands-on: Our pilot plant is in Borås and this role is based where the work happens, close to the lab and the pilot, not behind a laptop. Expect to spend most of your time on site, keeping the lab running and supporting the team's experiments. Small team, high ownership: We are around 10 people. You will own lab operations end-to-end and work directly with the R&D team, industrial engineer and CEO. No layers, no committees. Pace matters: We have pilot reception milestones in 2026 and customer commitments behind them. We move fast, decide with the data we have, and iterate. Compensation & benefits Wellness allowance Pension scheme 30 days vacation Rapid career growth Employment type Full-time Location Borås, Viared

Vi söker en skicklig produktionstekniker med stark mekanisk kompetens inom superkritisk CO2 eller textilproduktion. I denna roll kommer du att stödja den dagliga produktionen, genomföra tester och arbeta praktiskt med vår utrustning och våra processer för att säkerställa högkvalitativa resultat. Din kunskap kommer också att hjälpa oss att identifiera förbättringsområden och driva kontinuerlig optimering genom hela produktionslinjen.

About us At Renasens, we’re a small team building something ambitious: a textile recycling technology that will change the world. We have developed a waterless process using minimal energy and chemicals with a neutral impact on fiber quality. This allows us to recycle the most challenging textile waste: blended post-consumer polycotton in any colour, with any additives, composition, or quality, utilizing what is currently the most common yet unwanted fraction of textile waste. A valid EU and Sweden work permit is required. Role overview Seeking a skilled textile chemist to innovate in recycling processes and sustainable materials for the textile industry. Responsibilities Design and optimize chemical modification techniques for textiles (e.g., impregnation, functional layers, compatibilizers) Develop formulations or treatments to improve fiber interface performance and stability Analyze surface chemistry using techniques such as XPS, SEM, FTIR, or contact angle measurements Collaborate on scale-up strategy for coating and functionalization methods Qualifications PhD or Master's degree in Textile Chemistry, Material Science, Polymer Chemistry or related field Excellent communication and collaboration skills Experience in the textile industry Compensation & Benefits Wellness allowance Pension scheme Rapid career growth Employment type Full-time Location Europe