Colossyan

Causaly is redefining how humans acquire knowledge and develop insights in biomedicine. Our AI-powered platform enables researchers and decision-makers to discover and interpret evidence from millions of scientific publications, clinical trials, regulatory documents, and other complex data sources in minutes. We are building the world's most advanced biomedical knowledge platform, powered by a high-precision Knowledge Graph and GenAI capabilities. Our technology is already used by leading biopharmaceutical organizations to accelerate drug discovery, improve safety, and drive better decision-making. Backed by top-tier investors including ICONIQ, Index Ventures, Pentech, and Marathon, we are scaling rapidly and expanding our product suite and market presence. We are looking for a Staff Fullstack Engineer to work on our API and business services. You will be responsible for designing and building scalable, reliable, and maintainable web applications. You will collaborate with our product and research teams to build and ship new features, contributing to all aspects of the development lifecycle, from requirements gathering to deployment and monitoring. What we're looking for Significant experience with back-end applications Solid understanding of JavaScript Familiarity with Node.js Experience with TypeScript Good knowledge of web architecture (URIs, HTTP, Caching, etc) Proficiency in Git version control Familiarity with UNIX terminal Excellent knowledge of English language (verbal and written) Solid understanding of relational databases Preferred Qualifications Experience working with Knowledge Graphs and graph databases, such as Neo4J Experience working with Full-Text search databases, such as ElasticSearch Good understanding of GraphQL Experience working with Docker Experience working with a functional programming language Experience working with AWS or Google Cloud Technology Stack The list below is indicative and not exhaustive of the technologies we use at Causaly. Node.js Typescript Git ElasticSearch Neo4J RxJS React Webpack Benefits Competitive compensation package Private medical insurance Life insurance (4 x salary) Personal development budget Individual wellbeing budget 25 days holiday plus bank holidays Your birthday off! Potential to have real impact and accelerated career growth as a member of an international team that's building a transformative AI product. We are on a mission to accelerate scientific breakthroughs for ALL humankind, and we are proud to be an equal opportunity employer. We welcome applications from all backgrounds and fairly consider qualified candidates without regard to race, ethnic or national origin, gender, gender identity or expression, sexual orientation, disability, neurodiversity, genetics, age, religion or belief, marital/civil partnership status, domestic / family status, veteran status or any other difference.

Colossyan is looking for a Staff Fullstack Engineer to join our team in Greater London. You will be responsible for designing and building scalable, reliable web applications while collaborating with product and research teams. This role offers an exciting opportunity to influence the development lifecycle and make a real impact in the field of AI-powered biomedical insights. The position comes with a competitive compensation package, private medical and life insurance, and unique benefits including personal development budgets and 25 vacation days.

Data Engineer We're looking for a Mid-Level Data Engineer to join our team to design, build, and maintain the data pipelines, models, and platforms that power insights and decision-making across Yoto. What you'll be doing Building robust and scalable data extraction pipelines using dlthub, getting data from our diverse sources (e.g. internal platform, third- and first-party APIs, etc.) into our existing pipeline infrastructure Creating, maintaining and optimising data models using dbt, turning data into usable, enriched datasets for internal self-service reporting and analytics use Working with Dagster as our orchestration platform to manage pipeline dependencies, scheduling, and monitoring Partnering with data scientists and analysts to make sure that datasets are meaningful, intuitive and relevant for their use cases, particularly for consumption via Lightdash (our BI tool) Creating clear data governance principles and practices, being an advocate for high quality data creation and usage across the business Contributing to data platform infrastructure management and optimisation What you'll bring Proven experience in a data engineering and/or analytics engineering role, with a track record of having sustained impact Experience with modern orchestration tools (Dagster preferred, Airflow or similar also welcome) for managing complex data workflows Excellent SQL and strong Python expertise - you'll be writing custom data assets in Dagster and contributing to dbt pipelines Experience with core git workflows and version control best practices Experience working cross-functionally and building strong relationships with data users of varying degrees of data literacy Comfortable with ambiguity and excited by the opportunity to shape how data drives decision-making at Yoto Salary £60,000 - £70,000 based on experience What you can expect from Yoto Flexibility: Hybrid working - expectation of 1 day a week on average in our London office, but you are welcome to come in more than this. Take advantage of our 'work from anywhere' policy to work from a different location for up to 6 weeks every year. Summer Hours policy to use between the months of June and August. Financial: Generous share option programme, income protection, company sick pay, life assurance from day one, pension contributions, and employee referral bonus scheme. Health & Wellness: Private medical insurance, wellbeing allowance, 24/7 employee assistance, dental guidance, and bike to work scheme. Time Off: 25 days of holiday per year plus bank holidays, birthday off, extra holiday for each year worked after 2 years up to 5 extra days, and sabbatical after 4 years. Helping Families: Family-friendly leave and nursery scheme. People & Planet: Volunteer days and book allowance for development. Fun Perks: Your own Yoto player and starter pack, regular socials and YotoFest. Equity and Diversity At Yoto, we love creating a world where childhood is rich with discovery and joy. We're also passionate about building a workplace where everyone can thrive - both professionally and personally. We value flexibility and give our team the freedom to balance life and work in ways that suit them. We're committed to fostering a safe, diverse, and inclusive environment where all individuals feel valued and supported. Our Diversity, Equity and Inclusion group holds bi-monthly forums to elevate diverse voices and perspectives, ensuring everyone at Yoto feels heard, respected, and appreciated. We don't just embrace differences - we celebrate them. We share audio content from a vibrant and diverse community of creators and we are building a team that reflects that same diversity. Take a look at our DEI selection, and our approach to People and Planet on our website. Please only apply or engage with Yoto jobs posted on our careers page. All correspondence from our Talent team will only come through Teamtailor, our application tracking system.

A dynamic tech company in the United Kingdom is seeking a Mid-Level Data Engineer. You will design, build, and maintain data pipelines, ensuring data integrity and facilitating insights. The role requires strong SQL and Python skills, along with experience in modern orchestration tools like Dagster. You can expect a hybrid working model and a range of attractive benefits, including a generous salary of £60,000 - £70,000 based on experience.

About Huzzle At Huzzle, we connect high-performing professionals with global companies across the UK, US, Canada, Europe, and Australia. Our clients include startups, digital agencies, and tech platforms in industries like SaaS, MarTech, FinTech, and EdTech. We match top talent to full-time remote roles where they're hired directly into client teams and provided ongoing support by Huzzle. Role Type: Full-time Engagement: Independent Contractor Job Summary We are looking for a highly skilled Automation Engineer with strong n8n experience to design, build, and maintain workflow automations that streamline business processes. This is a fully remote opportunity ideal for someone passionate about low-code/no-code automation, API integrations, and system optimization. Key Responsibilities Design and implement automated workflows using n8n to optimize business operations Integrate third-party tools (CRMs, marketing platforms, databases, APIs) into seamless workflows Develop and maintain custom nodes or scripts when required Monitor, troubleshoot, and improve existing automations for performance and reliability Collaborate with cross-functional teams (sales, marketing, ops) to identify automation opportunities Document processes, workflows, and system architecture Ensure data integrity, security, and scalability across automation systems Proven experience as an Automation Engineer, Workflow Engineer, or similar role Strong hands on experience with n8n (required) Solid understanding of APIs, webhooks, and RESTful services Experience with tools like Zapier, Make (Integromat), or similar is a plus Basic scripting knowledge (JavaScript, Python, or Node.js preferred) Familiarity with CRMs (HubSpot, Salesforce), databases, and SaaS tools Strong problem solving skills and attention to detail Excellent communication skills for remote collaboration Fully Remote: Work from anywhere with international teams Career Growth: Join companies in SaaS, MarTech, and B2B services Peer Community: Connect with high-performing sales professionals in our network Ongoing Support: Receive guidance from Huzzle before and after placement Tailored Compensation: Salaries vary by client and candidate preference - we'll match you with options that fit your goals

A leading online retail company is seeking a Head of eCommerce to drive our global strategy and growth. The candidate will manage the digital P&L, aiming to balance revenue growth and profitability. Responsibilities include optimizing marketing initiatives and ensuring a smooth online shopping experience. Ideal candidates will have experience in eCommerce leadership, particularly in fast-growth businesses, and a passion for driving customer experience through innovative strategies.

Head of eCommerce We're looking for a Head of eCommerce to join our team to oversee and drive our global ecommerce strategy and growth. About Yoto Yoto is a screen free interactive audio platform for kids. We make carefully connected audio players that kids control, with no microphones, cameras or ads. We have a catalogue of audio that inspires creative play and learning with 1,000+ titles in our card store from top creators, publishers and labels - think Disney, Marvel, Roald Dahl and Universal Music. We also create Yoto Originals like BrainBots. Voted the 14th fastest growing private software technology company in Britain in The Sunday Times 100 Tech 2025; and named the 94th fastest growing company in Europe in the prestigious FT1000. Ranked 9th in Fast Company's Most Innovative Companies in 2024; and featured in the Sifted 100 fastest growing startups across the UK I by revenue growth. Featured in Bloomberg's 25 UK startups to watch in 2023; and ranked second fastest growing tech company in the UK in the Deloitte Fast50. Named one of TIME Magazine's Top 100 Inventions of 2020. We're over 200 employees spread across the world and growing! We're on a mission to be the soundtrack of childhood, and help families on their own unique adventures. By creating products that inspire independent play, we help families discover and grow with an inspiring world of audio - and we would like you to help us achieve it! What you'll be doing Own the digital P&L, balancing revenue growth and profitability through trading decisions, contribution margin optimisation and clear performance accountability. Lead weekly trading rhythm including forecasting and sell through management aligned to the commercial calendar. Define discount architecture, markdown cadence, bundles and thresholds using elasticity, demand signals and margin guardrails. Improve conversion, AOV and repeat purchase through merchandising, UX optimisation, checkout performance and structured experimentation. Co define the commerce roadmap across web and app, using data to prioritise initiatives that scale. Work closely with the marketing team to optimise paid media, SEO, email marketing, and social commerce strategies. Collaborate with supply chain, fulfilment and customer service teams to ensure a smooth end to end online shopping experience. Apply cohort analysis, attribution logic, unit economics and performance modelling to guide decisions and evaluate investment impact. Build and lead a high accountability team, establishing trading cadences, a test and learn culture and cross functional decision frameworks. What you'll bring Proven experience in an eCommerce leadership role within a DTC business; experience at a fast growth startup/scale up is a huge plus. Strong understanding of eCommerce platforms (Shopify a must have, Dato highly desirable). Expertise in website analytics tools (Google Analytics, Heap, etc.) and A/B testing. Track record of scaling online sales, optimising conversion rates, and growing customer lifetime value (LTV). Experience with performance marketing, retention strategies and omnichannel commerce. Experience collaborating with Product and Technology teams to improve the eCommerce experience on web and app. Strong leadership, team management and stakeholder collaboration skills. Strong analytical skills with the ability to interpret data and make data driven decisions. Passion for digital commerce, customer experience and brand growth. Comfortable leveraging AI and automation to scale processes, accelerate insight generation and improve decision quality across trading and operations. Bachelor's degree. A passion for audio content and technology. Ability to think on your feet and learn fast. Salary £85,000 - £95,000 based on experience. What you can expect from Yoto Flexibility: Hybrid working - expectation of 1 day a week on average in our London office, but you are welcome to come in more. You can work from a different location for up to 6 weeks every year. Summer Hours policy to use between June and August. Financial: Receive Income Protection, covering long term sickness for up to 2 years and company sick pay that increases with length of service. Life Assurance cover from day one of your service. Workplace Pension offering up to 3% employer contributions, following probation. Generous employee referral bonus scheme. Health & Wellness: Private Medical Insurance via Aviva, or a Wellbeing Allowance to be used for memberships, subscriptions, treatment or therapy. Access to 24/7 Employee Assistance Programme (EAP) through WeCare and unlimited access to dental advice and guidance via Toothfairy. Bike to work scheme. Time Off: 25 days of holiday per year plus bank holidays. Birthday off and an extra day of holiday for every year worked after your 2 year anniversary, up to 5 extra days. After 4 years of service, you are also eligible for our sabbatical policy offering up to 3 months' unpaid sabbatical. Helping Families: Variety of family friendly leave, including enhanced maternity, paternity, adoption, fertility, pregnancy loss and carers leave. Unlock savings with our workplace nursery scheme, supporting parents of preschool aged children. People & Planet: Up to 2 volunteer days a year. A Book Allowance of up to £50 a year to contribute to your professional development. Fun Perks: You receive your very own Yoto player and starter pack of cards! Regular company socials and celebrations, including our annual YotoFest! Equity and Diversity At Yoto, we love creating a world where childhood is rich with discovery and joy. We're also passionate about building a workplace where everyone can thrive - both professionally and personally. We value flexibility and give our team the freedom to balance life and work in ways that suit them. We're committed to fostering a safe, diverse, and inclusive environment where all individuals, regardless of their background, feel valued and supported. Our Diversity, Equity and Inclusion group holds bi monthly forums to elevate diverse voices and perspectives, ensuring everyone at Yoto feels heard, respected, and appreciated. We don't just embrace differences - we celebrate them. We share audio content from a vibrant and diverse community of creators (check out our DEI selection), and we are building a team that reflects that same diversity. We invite candidates from all walks of life to explore opportunities with us and join a company that champions flexibility, equity, and inclusion. Take a look at our website for more information on our approach to People and Planet. Application Process Please only apply or engage with Yoto jobs posted on our careers page or All correspondence from our Talent team will only come through Teamtailor, our application tracking system. Already working at Yoto? Let's recruit together and find your next colleague.

An education technology platform is seeking a full-stack engineer to design and build online learning features. The role requires strong Java and Node.js skills along with React and TypeScript. The successful candidate will use AI tools to enhance development, own production responsibilities, and contribute to architectural decisions. Join a global team to positively impact education accessibility.

Location United Kingdom Employment Type Full time Location Type Remote Department Technology Engineering MyEdSpace is an education technology platform that connects the best teachers on the planet with the students who need them the most - wherever they are, whatever their means. Backed by $15m in Series A funding from some of the leading investors in the space, we're ready to scale - and we want you to help us build and scale MyEdSpace as part of a collaborative and ambitious team. We're on a mission to make a world-class education accessible to all. We believe that every child deserves access to quality education, regardless of geography or socioeconomic background, to achieve their dreams and build a brighter future. If you're motivated by solving meaningful problems and creating real impact through your work on a societal level and make a real impact on the world - we'd love to hear from you! Your Impact at MyEdSpace We're building the platform that powers how thousands of families experience online learning with a focus on clarity, strong domain design, and long-term thinking. As we evolve our architecture with new Java/Node.js services and a modern React frontend, your work will shape how these systems fit together and how the product scales. You'll join a team that values engineering fundamentals, product thinking, and a culture where impact matters more than output. This is a place where senior engineers influence direction not just execution. What We're Looking For Strong full-stack engineering experience - Deep backend experience in Java, Node.js, or another modern stack, paired with solid React + TypeScript skills. You're as comfortable building services as you are building the UI that sits on top of them. AI-augmented engineering - You use AI tools as a natural part of your workflow to accelerate development and explore solutions faster. But you retain strong engineering judgement - you review, challenge, and harden AI-generated code before it reaches production. AI amplifies your thinking; it doesn't replace it. Engineering fundamentals over frameworks - You think in terms of system design, data modelling, trade-offs, and long-term maintainability. Languages and frameworks are tools - not identity. Multi-stack pragmatism - Our platform spans Java, Node, React, and some existing PHP systems. You're comfortable working in real-world production environments and improving systems incrementally as architecture evolves. Architectural maturity - You understand boundaries, contracts, invariants, and how local decisions impact system coherence over time. Production ownership - CI/CD, containerisation, cloud environments (AWS), observability - you're comfortable owning code beyond merge. Value-driven mindset - You care about solving the right problem sustainably, not just shipping features. What You'll Be Doing Designing and building end-to-end product features across backend services and our React frontend. Building well-structured, testable backend services and clean, reusable frontend components - with attention to performance, usability, and long-term maintainability. Contributing to a multi-stack production environment, improving existing systems thoughtfully while helping evolve the overall architecture. Modelling domains, defining boundaries, and contributing to architectural decisions that keep the system coherent as it scales. Using AI tools to accelerate development - while reviewing, validating, and refining generated code before it reaches production. Owning work beyond feature delivery: CI/CD, observability, performance, and production behaviour. Participating in code reviews and technical discussions with a focus on clarity, trade-offs, and engineering judgement. Improving reliability, security, and operational robustness as the platform grows. Raising the engineering bar through thoughtful feedback, pragmatic decisions, and steady improvement rather than dramatic rewrites. Our Interview Process People Team Intro (30 mins) A conversation with our recruitment team to get to know each other better. You'll learn more about MyEdSpace and how we work, while we'll explore what motivates you, how you like to collaborate, and whether our ways of working align. Coding Exercise (take-home, 2-3 hours) A take-home exercise to assess practical engineering skills - architecture, clean code, testing, and problem-solving. We strongly encourage you to use AI coding tools during the exercise. Technical Interview (1 hour) We'll review your coding exercise together and use it as a springboard into a deeper conversation about your engineering approach - past projects, technical decisions, and systems thinking. This session is joined by our tech leads and/or another engineer Culture & Collaboration Interview (45 mins) A closing conversation with our VP of Engineering to assess team fit, communication style, and alignment with our values and ways of working. Our values PUT INTEGRITY FIRST Honesty matters. Tell the truth, and be straight-up. Be transparent and do the right thing. This builds respect and reliability for our students, families and team members. KNOW YOUR COORDINATES Understand where you are and where you want to get to. Know your strengths and acknowledge your gaps. Think from first principles. Question things, and never pretend to know what you don't. RAISE THE BAR Own it and get it done. Do better. Iterate quickly and seek feedback. Deliver real value. Be excellent and lift others up. Share learnings and help your teammates improve. LOVE TO BE WRONG Push boundaries. Be outside your comfort zone. Naturally you'll get some things wrong and that's okay. Embrace feedback. Learn from it and get closer to excellence. WIN TOGETHER To achieve our mission, we have to work together. We all have a role to play, so help each other get there. We're stronger as a team so inspire, support and respect each other. Why you'll love working here We're a team on a mission to transform education for the better. Joining MES means you'll be part of something ambitious, fast-moving, and full of purpose. Here's what you can expect: The chance to make a real impact: your work directly shapes the future of education. A fast-paced and high-growth environment where ideas move quickly and careers accelerate. A collaborative, supportive culture: we're head quartered in the UK, but we're a global team with colleagues in 15+ countries, bringing a rich mix of perspectives and energy. We are committed to building a diverse team and strongly encourage applications from candidates of all backgrounds. We believe diverse perspectives make us stronger and help us build a better product for students around the world.