
DeepL · London
MEET DEEPL DeepL is a global AI product and research company focused on building secure, intelligent solutions to complex business problems. Over 200,000 busin...
DeepL is a global AI product and research company focused on building secure, intelligent solutions to complex business problems.
Over 200,000 business customers and millions of individuals across 228 global markets today trust DeepL's Language AI platform for
human-like translation, improved writing and real-time voice translation.
Founded in 2017 by CEO Jaroslaw “Jarek” Kutylowski, DeepL now has around 1,000 passionate employees and is supported by
world-renowned investors including Benchmark, IVP, and Index Ventures.
Our goal is to become the global leader in trusted, intelligent AI technology, building products that drive better communication,
foster connections, and create a meaningful impact. To achieve this, we need talented people like you to join our journey. If
you’re ready to shape the future of AI and grow your career in a fast-moving, purpose-driven environment, DeepL is your next
destination.
What sets us apart is our blend of cutting-edge AI technology, meaningful work, and a culture where people truly thrive. We’re a
team of innovators, researchers, and creators driven by a shared purpose to unlock human potential by making work simpler,
smarter, and more connected.
When we share what it’s like to work at DeepL, the reactions are overwhelmingly positive. This might be because of our technology
that helps millions of people and businesses communicate and work better every day, or because of the trust, curiosity, and care
that shape our culture.
What we know for sure is this: being part of DeepL means joining a team dedicated to innovation, growth, and well-being. Discover
more about life at DeepL onLinkedIn,Instagram, and our Blog.
Our Language AI teams form the foundation of DeepL's success. We are a dedicated group of researchers who collaborate closely with
engineers, product managers, and designers. Our mission is to build the world's leading language AI system to deliver perfect
translations for the most demanding use cases. To that end, we take responsibility for the entire life cycle of the machine
learning models that power our language AI products. This includes data, training, quality assurance, and operational aspects. In
our highly collaborative teams, each person has the scope to drive impact across the company.
We are looking for a Senior Research Scientist to lead fine-tuning, post-training, and reinforcement learning for the next
generation of DeepL's document translation multimodal and vision models. This is a high-impact, hands-on role for a researcher who
can own a major research direction, prototype rapidly, run large-scale experiments, and drive breakthroughs all the way into
production.
You will develop models that reason about document layout by fusing expert, real world and synthetic data, while leading efforts
to make our translation highly steerable and adaptable.
and generation to end-to-end models.
knowledge distillation, preference optimization, and reinforcement learning tuned to translation quality.
mitigate reward hacking and quality-estimation failure modes.
deployment, working closely with engineering to ship into real-time systems at scale.
learning (RLHF/RLAIF, PPO/GSPO, and reward modeling).
curation and filtering, data augmentations, and/or reasoning about data mixtures and ablations.
production while staying grounded in product impact and real-world quality.
research with product and engineering priorities.
product impact, user experience, and real-world performance.
multimodal machine translation.
and human-in-the-loop evaluation.
You are welcome at DeepL for who you are - we appreciate authenticity here. Our product is for everyone, and so is our workplace.
The more voices we have represented and amplified in our business, the more we will all succeed, contribute, and think forward! So
bring us your personal experience, your perspectives, and your background. It’s in our diversity that we will find the power to
break down language barriers in the world.
MEET DEEPL DeepL is a global AI product and research company focused on building secure, intelligent solutions to complex business problems. Over 200,000 business customers and millions of individuals across 228 global markets today trust DeepL's Language AI platform for human-like translation, improved writing and real-time voice translation. Founded in 2017 by CEO Jaroslaw “Jarek” Kutylowski, DeepL now has around 1,000 passionate employees and is supported by world-renowned investors including Benchmark, IVP, and Index Ventures. Our goal is to become the global leader in trusted, intelligent AI technology, building products that drive better communication, foster connections, and create a meaningful impact. To achieve this, we need talented people like you to join our journey. If you’re ready to shape the future of AI and grow your career in a fast-moving, purpose-driven environment, DeepL is your next destination. WHAT SETS US APART What sets us apart is our blend of cutting-edge AI technology, meaningful work, and a culture where people truly thrive. We’re a team of innovators, researchers, and creators driven by a shared purpose to unlock human potential by making work simpler, smarter, and more connected. When we share what it’s like to work at DeepL, the reactions are overwhelmingly positive. This might be because of our technology that helps millions of people and businesses communicate and work better every day, or because of the trust, curiosity, and care that shape our culture. What we know for sure is this: being part of DeepL means joining a team dedicated to innovation, growth, and well-being. Discover more about life at DeepL onLinkedIn,Instagram, and our Blog. MEET THE TEAM BEHIND THIS JOURNEY Our Language AI teams form the foundation of DeepL's success. We are a dedicated group of researchers who collaborate closely with engineers, product managers, and designers. Our mission is to build the world's leading language AI system to deliver perfect translations for the most demanding use cases. To that end, we take responsibility for the entire life cycle of the machine learning models that power our language AI products. This includes data, training, quality assurance, and operational aspects. In our highly collaborative teams, each person has the scope to drive impact across the company. YOUR RESPONSIBILITIES We are looking for a Senior Research Scientist to lead fine-tuning, post-training, model-steerability, and reinforcement learning for the next generation of DeepL's LLM-based translation models. This is a high-impact, hands-on role for a researcher who can own a major research direction, prototype rapidly, run large-scale experiments, and drive breakthroughs all the way into production. Your central focus is how we blend data and shape model behaviour after pre-training. You will fuse high-value human expert data with synthetic data, and you will lead the effort to make our translation models steerable, following custom user instructions, rules, and context. You will work with model architectures at the scale of hundreds of billions of parameters. You will: * Drive the development of translation models that are steerable conditioned on user preferences, rules and context. * Drive hands-on research and development on post-training for our core translation models: supervised fine-tuning, knowledge distillation, preference optimization, and reinforcement learning tuned to translation quality. * Build reward models and evaluator models for translation, including rubric- and reference-based grading, and investigate and mitigate reward hacking and quality-estimation failure modes. * Drive an agenda toward models that ingest multimodal content and context to increase translation quality. * Own the full lifecycle of model delivery: prototyping, ablations, training, evaluation, optimization, and production deployment, working closely with engineering to ship into real-time systems at scale. * Establish strong practices for evaluation, reproducibility, monitoring, and continuous model improvement in production. * Mentor researchers and engineers, promote hands-on collaboration, and raise the bar for model quality. QUALITIES WE LOOK FOR * Proven experience making large models steerable and instruction-following by identifying the most effective method to instill a given behavior, drawing from instruction tuning, latent space methods, steering vectors, and/or constrained encoding and decoding methods. * Deep, hands-on expertise in LLM post-training (SFT, DPO), knowledge distillation (teacher-student training), and/or reinforcement learning (RLHF/RLAIF, PPO/GSPO, and reward modeling). * Strong data-centric instincts for building synthetic-data and preference-data pipelines, LLM-as-judge generation, data curation and filtering, and reasoning about data mixtures and ablations. * Experience designing evaluation and reward signals using automatic metrics, LLM-as-judge evaluation, non-verifiable rewards, and human-in-the-loop evaluation. * A hands-on builder who enjoys training models, running experiments, debugging pipelines, and integrating ML systems into production while staying grounded in product impact and real-world quality. * Ownership of a substantial research direction with strong execution, and experience mentoring others on a fast-moving, applied research team. * Strong coding and experimentation skills (Python, PyTorch/JAX/Tensorflow), and the ability to communicate clearly and align research with product and engineering priorities. NICE TO HAVE * Demonstrated experience fine-tuning and training large models at scale, including distributed/multi-node training (e.g. FSDP, DeepSpeed, or Megatron-style frameworks) and efficient training techniques. * Experience fine-tuning existing reasoning models for specific tasks and behaviors without degrading their reasoning capabilities. * Experience with machine translation, multilingual NLP, or language quality estimation. * Familiarity with inference and serving at scale (e.g. via vLLM, SGLang, TensorRT-LLM, etc) and long-context modelling. * Publications at top-tier venues. WHAT WE OFFER * Diverse and internationally distributed team: joining our team means becoming part of a large, global community with people of more than 90 nationalities. We're more than just colleagues; we're a group of professionals with a shared mission to connect diverse cultures. Our global presence is growing–we've doubled in size nearly every year, with our employees based in the UK, Germany, the Netherlands, Poland, the US, and Japan, and we continue to expand our network. * Open communication, regular feedback: as a language-focused company, we value the importance of clear, honest communication. We value smooth collaboration, direct and actionable feedback, and believe that leading with empathy and growth mindset makes us better together. * Hybrid work, flexible hours: we offer a hybrid work schedule, with team members coming into the office twice a week. This allows you to engage directly with your team and experience the unique energy of our workspace, while still enjoying the flexibility and comfort of working from home. With flexible working hours and trust in your productivity, we are in sync with your team’s general locations and time zones to foster effective and seamless collaboration. * Virtual Shares - An ownership mindset in every role. We believe everyone should share in our success, and that’s why every employee receives Virtual Shares, linking your contribution directly to DeepL’s growth and rewarding you with a stake in our future. * Regular in-person team events: we bond over vibrant events that are as unique as our team, from local team and business unit gatherings, to new-joiner onboardings, to company-wide events that bring us all together–literally. * Monthly full-day hacking sessions: every month, we have Hack Fridays, where you can spend your time diving into a project you're passionate about and get the opportunity to work with other teams–we value your initiatives, impact, and creativity. * 30 days of annual leave: we value your peace of mind. With 30 days off (excluding public holidays) and access to mental health resources, we make sure you're as strong mentally as you are professionally. * Competitive benefits: just as our team spans the globe, so does our benefits package. We've crafted it to reflect the diversity of our team and tailored it to align with your unique location, to ensure you feel supported every step of the way. If this role and our mission resonate with you, but you're hesitant because you don't check all the boxes, don't let that hold you back. At DeepL, it's all about the value you bring and the growth we can foster together. Go ahead, apply—let's discover your potential together. We can't wait to meet you! WE ARE AN EQUAL OPPORTUNITY EMPLOYER You are welcome at DeepL for who you are - we appreciate authenticity here. Our product is for everyone, and so is our workplace. The more voices we have represented and amplified in our business, the more we will all succeed, contribute, and think forward! So bring us your personal experience, your perspectives, and your background. It’s in our diversity that we will find the power to break down language barriers in the world.
Senior Scientist Model Systems About Relation Relation is a sector defining TechBio company developing transformational medicines, with technology at our core. Our ambition is to understand human biology in unprecedented ways, discovering therapies to treat some of life’s most devastating diseases. We leverage single-cell multi-omics from patient tissue, functional assays, and machine learning to drive disease understanding, from cause to cure. We are scaling rapidly and building a team of exceptional individuals to push the boundaries of drug discovery. You will work in highly interdisciplinary teams where biology, computation, and engineering come together to solve complex problems that have not been solved before. Our state-of-the-art wet and dry labs in the heart of London are designed to accelerate this integration and translate insight into impact. We are committed to building diverse and inclusive teams. Relation is an equal opportunities employer and does not discriminate on the basis of gender, sexual orientation, marital or civil partnership status, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability, or age. By joining Relation, you will help define how medicines are discovered and deliver meaningful impact for patients. The opportunity At Relation, we are building proprietary large-scale datasets to advance the prediction of disease-associated genes using cutting-edge functional genomics and machine learning approaches. We are offering an exciting opportunity for an experienced Senior Scientist to drive our automation capabilities in running large scale perturbation studies on mono- and co-culture systems of fibrotic disease. In this role, you will be at the forefront of scientific discovery and make a meaningful impact in the field of biology, working at the intersection of science and technology within a rapidly growing TechBio company. The successful candidate will contribute significantly to capture the cellular response using a multimodal readout strategy that includes transcriptomics, proteomics and molecular signatures of functional phenotype. You will partner closely with colleagues across Discovery and Technology, whilst still being provided the opportunity to expand your skills and advance your knowledge-base on assay development, screening and automation. Day to day, you will have the following key responsibilities: * Integrate human primary cell lines into robust monoculture and co-culture models that are capable of large batch production and compatible for high throughput readouts, with the necessary quality control (QC). * Characterise and optimise multiplexed imaging and biochemical assays that provide readouts for functional phenotyping. * Transition manually developed perturbation models into an automated arrayed screen. * Contribute to the development and implementation of new technologies, workflows, and operational infrastructure. * Carrying out data analysis and relevant quality assurance protocols. * Communicate outcomes of your work to team members and external parties in written or verbal reports. * Stay up to date of relevant scientific literature and incorporate new findings into research project planning and experiment design. * Proactive identification of potential project issues and communication of proposed solutions to the team. * Communicate closely with cross-functional colleagues across biology, machine learning and automation disciplines and assist with solving complex scientific challenges and accelerate programme delivery. Professionally, you will have * PhD with 5+ years experience and demonstrable knowledge in assay development and/or target validation. * Strong background in culturing of primary and immortalised cell lines as well as functional disease relevant endpoints with the aim of ensuring required reproducibility and sensitivity in those assays. * Hands-on experience in image capture and data interpretation using High content imaging with cell painting. * Scientific knowledge of fibrosis across various tissues. * Knowledge of CRISPR/Cas9 gene editing for modulating gene expression in 2D and 3D cell systems. * Prior experience running pathway-modifying perturbation screens. * Experience with automated laboratory systems. * Extensive knowledge in industry-standard large ‘omic dataset handling and recording keeping. * Excellent communication, influencing and interpersonal skills, with the ability to thrive in a collaborative, cross-functional, matrixed environment * High motivation, scientific rigor and be able to comfortably operate in a fast-paced, evolving biotech setting Personally, you * Are comfortable working in a matrixed environment, balancing multiple stakeholders and contributing effectively across teams. * Take ownership of your work, proactively seek opportunities to contribute, and enable others to do their best work. * Communicate openly and directly, give and receive feedback constructively, and handle challenging conversations with respect. * Actively seek out diverse perspectives, build strong working relationships, and contribute to shared goals across teams. * Embrace challenges with openness and resilience, set high standards for yourself, and strive to deliver meaningful outcomes. Working Style & Culture at Relation At Relation, we operate in a matrixed, interdisciplinary environment, where impact is driven through collaboration across scientific, technical, and operational domains. We collaborate, and you will partner with colleagues across multiple teams and projects, contributing your expertise while aligning to shared company priorities. We work together and win together! The patient is waiting! Recruitment Agencies Please note that Relation does not accept unsolicited resumes from agencies. Resumes should not be forwarded to our job aliases or employees. Relation will not be liable for any fees associated with unsolicited CVs. Relation is a committed equal opportunities employer.
GROW WITH TREEFERA We are a first-mile intelligence platform, delivering granular visibility into the point of origin in global ag & soft commodity supply chains - where risk, cost, performance and exposure are set. You’ll join a global, cross-functional team that values rigour, curiosity and working close to real-world challenges. Whether your focus is AI, climate, product or operations, you’ll have space to contribute meaningfully and make an impact from day one. If you’re excited by complex problems and want to help reshape how nature is valued in real-world decision-making, we’d love to hear from you. ROLE OVERVIEW Transform satellite, radar, and LiDAR signals into precise intelligence that protects forests and fortifies supply chains. You will develop models ranging from EUDR-compliant plantation mapping, to biomass estimation and forest degradation that accelerate decarbonisation and in turn enable confident, risk-adjusted decisions at global scale. WHO YOU ARE * You take models across the full lifecycle — research, prototyping, validation and productionisation — and you have shipped them in an industry, product or startup setting, not only in research. * You are fluent across the modern Python ML stack — deep learning (CNNs, U-Nets, vision transformers) in PyTorch and classical methods (gradient boosting, random forests) in scikit-learn — and you pick the right approach for the problem. * You work fluently with remote sensing data (optical and SAR) and geospatial Python tooling (rasterio, xarray, geopandas, GDAL and the STAC ecosystem), and you understand the sensor-specific quirks that matter for modelling. * You design validation that benchmarks against reference datasets, quantifies uncertainty and surfaces failure modes — and you can explain modelling choices, uncertainties and trade-offs to scientific and non-scientific stakeholders alike. * You collaborate by default across Science, Engineering and Product, bring domain exposure to deforestation, land-use change, biomass or supply-chain transparency, and have a genuine appetite for AI-assisted development workflows. Desirable requirements (if applicable): * Building on EO foundation models as a downstream substrate — lightweight classifiers, regressors or similarity search on frozen embeddings (e.g. AlphaEarth Foundations, Clay), with fine-tuning or pretraining where the case justifies it. * Multi-modal fusion across optical (Sentinel-2, Landsat), SAR (Sentinel-1, PALSAR) and LiDAR (GEDI, ICESat-2), and time-series modelling for environmental change detection (temporal transformers, sequence or self-supervised approaches). * Familiarity with STAC-based catalogues (Google Earth Engine, Microsoft Planetary Computer, AWS Open Data), AI-assisted development as a core part of your workflow, and working cross-functionally alongside solutions architects, sales and engineering. WHAT THE JOB INVOLVES * Design, train and evaluate models — from gradient boosting to CNNs, U-Nets and vision transformers — for commodity and plantation mapping, land-cover classification, change and disturbance detection, and biomass / canopy-height estimation. * Build embedding-driven workflows on top of EO foundation models — few-shot classifiers, similarity search and downstream regressors. * Design validation strategies that benchmark outputs against plot inventories and third-party reference data, quantify uncertainty and surface failure modes — producing QA artefacts (maps, plots, model cards, error analyses) that internal teams and clients can defend. * Partner with Engineering to take models into scalable, reproducible inference pipelines across millions of plots. * Contribute to a strong research culture across Science, AI and Engineering — reviewed code, shared tooling and active engagement with EO/ML literature. WHAT SUCCESS LOOKS LIKE Within 30 days you'll understand where one of our solution domains touches the ground — its data, models and the customers who rely on it. By 60 days you'll be building: an iteration of an existing model or a new MVP. By 90 days it's released, or signed off and on its way — already sharpening the intelligence organisations use to protect forests and de-risk supply chains. By six months you own a domain such as biomass, forest degradation or commodity mapping and are its point of call. Within a year you'll have shipped a next-generation solution, such as reforestation (ARR) monitoring, that moves the needle on climate-positive outcomes. WHO YOU’LL WORK WITH You'll report to Matthew Courtis and partner day-to-day with the wider Science Team, working closely with Engineering and Product. INTERVIEW PROCESS & WHAT TO EXPECT Recruiter screen (30–45 min) Hiring manager interview (45-60 min) Team & skills session (45-60 min) Final cross-functional whiteboard exercise (In person). (60 - 90 min) Accessibility: Tell us if you need adjustments, we’ll accommodate. What you’ll gain at Treefera * Build something that matters - join a high-growth climate-tech company applying AI, satellite data and quantitative modelling to real-world challenges across global supply chains, commodities and carbon. * Work on complex, meaningful problems - develop systems that balance risk, resilience, compliance and sustainability, giving organisations a genuine information advantage at global scale. * Collaborate with exceptional people - work alongside scientists, engineers and operators who are leaders in their fields, combining academic rigour with practical, cross-functional product delivery. * Ship and grow in a high-trust environment - experiment, iterate and take thoughtful risks in a team that values autonomy, creativity and continuous learning. * Develop your craft - dedicated space and time to grow your skills toward mastery, tackling technically demanding challenges that push the boundaries of applied AI and environmental data. * Be rewarded for your impact - competitive compensation, equity options, meaningful benefits, and the opportunity to help shape the future of AI-powered risk and environmental intelligence. Diversity, Equity & Inclusion Bold solutions come from diverse teams. Please refer to our DEI & EEO commitment below. If you need any accommodation during the application process, we’re here to support you. Learn more about how we think and build Many of our engineers, scientists and product leaders share their thinking publicly. Explore the Treefera blog for technical deep dives, research and product perspectives. Privacy notice By applying to Treefera, you consent to the processing of your personal data in line with our Privacy Notice. TREEFERA IS AN EQUAL OPPORTUNITY EMPLOYER. WE BELIEVE THE DIVERSITY OF OUR PEOPLE IS AS VITAL AS THE DIVERSITY OF THE ECOSYSTEMS WE WORK TO PROTECT, AND WE ARE COMMITTED TO BUILDING AN INCLUSIVE WORKPLACE WHERE EVERYONE CAN THRIVE. WE WELCOME APPLICANTS OF ALL BACKGROUNDS IRRESPECTIVE OF RACE, COLOUR, ETHNICITY, NATIONAL ORIGIN, RELIGION, GENDER IDENTITY OR EXPRESSION, SEXUAL ORIENTATION, AGE, DISABILITY, PREGNANCY, OR ANY OTHER CHARACTERISTIC PROTECTED BY APPLICABLE LAW. REASONABLE ACCOMMODATIONS ARE AVAILABLE UPON REQUEST.