OnBuy.com
Bournemouth, Dorset
Who are OnBuy? OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed. Working at OnBuy We are a team of driven and motivated people who thrive when working at pace. To succeed at OnBuy you need to take charge and fully own your responsibilities, rolling your sleeves up when needed to 'get it done'. Working at OnBuy you are surrounded by so much opportunity, but you must possess the ability to stay focused and prioritise ruthlessly. Most importantly, you will thrive in an ever-changing environment as we are constantly evolving. At OnBuy, you're not just a number or another cog in a machine. We are creating something really special, and you have the opportunity to affect meaningful change and have your voice heard. We are a close team, who have the opportunity to learn and grow as OnBuy evolves. About the Role We're building a more intelligent, scalable product catalogue across multiple markets. Core capabilities like auto-categorisation and brand detection already exist, but they are not yet connected into a system that consistently drives quality, discovery, and growth. This role owns that system. The Senior Applied ML Engineer - Catalogue Intelligence is responsible for building the machine learning systems that power OnBuy's catalogue decisioning engine. Working in partnership with the Head of Seller Solutions, who defines catalogue rules and commercial logic, you will design and deploy production-grade systems that automatically improve: Product categorisation Product data quality and completeness Pricing competitiveness insights Catalogue coverage and selection Product discoverability This is a hands on, production-focused role where outputs directly modify the live catalogue and materially impact GMV, conversion performance, search, and discovery. Core mission Turn catalogue rules and commercial logic into automated, data-driven systems that continuously improve discovery, data quality, pricing competitiveness, and revenue outcomes. What you'll be responsible for You'll take ownership of how product data is structured, validated, and used across the platform. This includes: Improving how we classify and understand products at scale Raising the overall quality of catalogue data and defining what "good" looks like Ensuring product data supports effective search, filtering, and discovery Identifying gaps in our catalogue and surfacing opportunities for growth Improving how our catalogue performs across external channels You'll build and evolve the systems and decision logic that enable this, and iterate based on real-world performance and data You'll work across: Structured data (catalogue attributes, GTINs, taxonomy) Unstructured data (text and images) Behavioural data (search, clicks, conversions) How you'll work You'll build directly using SQL and Python on top of: BigQuery Airbyte GoogleDatastream You'll be working across data pipelines, information extraction, and production ML systems, combining rules, heuristics, and ML/LLMs where appropriate. The focus is on shipping practical systems quickly, validating them with real data, and improving them over time. You'll work closely with engineering, product, and analytics, but you'll be expected to own and deliver the core logic yourself. Not focused on research or offline modelling You'll be expected to build systems that operate in production and directly influence how products appear and perform on the platform. Experience & Skills Experience building and shipping production data or ML systems with measurable business impact Strong Python and SQL skills, with the ability to work across data pipelines end to end You should be comfortable applying modern approaches such as LLMs, multimodal models, and information extraction techniques, and take them from experimentation to production with proper evaluation, monitoring, and cost control Experience working with messy, unstructured or semi structured data (e.g. text, images, product data) Ability to design systems that make decisions, not just predictions Strong judgement in balancing accuracy, risk, and business impact Experience with ecommerce or marketplace catalogues is a plus, but not required How you'll operate Take ownership of problems end to end, from idea through to production impact Build systems that are scalable, testable, observable, and auditable Design automation with confidence thresholds, monitoring, and feedback loops in mind Maintain clear documentation, evaluation frameworks, and versioning for models and logic Work pragmatically, favouring simple solutions that deliver impact quickly Communicate trade offs clearly to technical and non technical stakeholders You should be comfortable working in environments where data is incomplete, inconsistent, and constantly evolving You'll be working across cloud based data systems (GCP), building and deploying data pipelines and production ML workflows. Experience with orchestration tools (e.g. Airflow or similar), CI/CD, and model deployment practices is beneficial The salary on offer for this role is £65000- £75000 depending on experience. Benefits Company Equity - In return for helping us to grow, we'll offer you company equity, meaning you own a piece of this business we are all working so hard to build 25 days annual leave + Bank Holidays 1 extra day off for your Birthday Employee Assistance Programme Perks at Work benefit platform Opportunities for career development and progression This role is UK remote or Hybrid if you live near our Manchester or Bournemouth's offices. Please only apply if you have the full right to work in the UK. Our Commitment OnBuy is an equal opportunities employer. We are dedicated to creating a fair and transparent workforce, starting with a recruitment process that does not discriminate on the basis of gender, sexual orientation, marital or civil partnership status, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability, or age. Just a heads up - we never use WhatsApp or any messaging apps to contact candidates. If someone reaches out this way, it isn't us and let the recruitment team know.
Who are OnBuy? OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed. Working at OnBuy We are a team of driven and motivated people who thrive when working at pace. To succeed at OnBuy you need to take charge and fully own your responsibilities, rolling your sleeves up when needed to 'get it done'. Working at OnBuy you are surrounded by so much opportunity, but you must possess the ability to stay focused and prioritise ruthlessly. Most importantly, you will thrive in an ever-changing environment as we are constantly evolving. At OnBuy, you're not just a number or another cog in a machine. We are creating something really special, and you have the opportunity to affect meaningful change and have your voice heard. We are a close team, who have the opportunity to learn and grow as OnBuy evolves. About the Role We're building a more intelligent, scalable product catalogue across multiple markets. Core capabilities like auto-categorisation and brand detection already exist, but they are not yet connected into a system that consistently drives quality, discovery, and growth. This role owns that system. The Senior Applied ML Engineer - Catalogue Intelligence is responsible for building the machine learning systems that power OnBuy's catalogue decisioning engine. Working in partnership with the Head of Seller Solutions, who defines catalogue rules and commercial logic, you will design and deploy production-grade systems that automatically improve: Product categorisation Product data quality and completeness Pricing competitiveness insights Catalogue coverage and selection Product discoverability This is a hands on, production-focused role where outputs directly modify the live catalogue and materially impact GMV, conversion performance, search, and discovery. Core mission Turn catalogue rules and commercial logic into automated, data-driven systems that continuously improve discovery, data quality, pricing competitiveness, and revenue outcomes. What you'll be responsible for You'll take ownership of how product data is structured, validated, and used across the platform. This includes: Improving how we classify and understand products at scale Raising the overall quality of catalogue data and defining what "good" looks like Ensuring product data supports effective search, filtering, and discovery Identifying gaps in our catalogue and surfacing opportunities for growth Improving how our catalogue performs across external channels You'll build and evolve the systems and decision logic that enable this, and iterate based on real-world performance and data You'll work across: Structured data (catalogue attributes, GTINs, taxonomy) Unstructured data (text and images) Behavioural data (search, clicks, conversions) How you'll work You'll build directly using SQL and Python on top of: BigQuery Airbyte GoogleDatastream You'll be working across data pipelines, information extraction, and production ML systems, combining rules, heuristics, and ML/LLMs where appropriate. The focus is on shipping practical systems quickly, validating them with real data, and improving them over time. You'll work closely with engineering, product, and analytics, but you'll be expected to own and deliver the core logic yourself. Not focused on research or offline modelling You'll be expected to build systems that operate in production and directly influence how products appear and perform on the platform. Experience & Skills Experience building and shipping production data or ML systems with measurable business impact Strong Python and SQL skills, with the ability to work across data pipelines end to end You should be comfortable applying modern approaches such as LLMs, multimodal models, and information extraction techniques, and take them from experimentation to production with proper evaluation, monitoring, and cost control Experience working with messy, unstructured or semi structured data (e.g. text, images, product data) Ability to design systems that make decisions, not just predictions Strong judgement in balancing accuracy, risk, and business impact Experience with ecommerce or marketplace catalogues is a plus, but not required How you'll operate Take ownership of problems end to end, from idea through to production impact Build systems that are scalable, testable, observable, and auditable Design automation with confidence thresholds, monitoring, and feedback loops in mind Maintain clear documentation, evaluation frameworks, and versioning for models and logic Work pragmatically, favouring simple solutions that deliver impact quickly Communicate trade offs clearly to technical and non technical stakeholders You should be comfortable working in environments where data is incomplete, inconsistent, and constantly evolving You'll be working across cloud based data systems (GCP), building and deploying data pipelines and production ML workflows. Experience with orchestration tools (e.g. Airflow or similar), CI/CD, and model deployment practices is beneficial The salary on offer for this role is £65000- £75000 depending on experience. Benefits Company Equity - In return for helping us to grow, we'll offer you company equity, meaning you own a piece of this business we are all working so hard to build 25 days annual leave + Bank Holidays 1 extra day off for your Birthday Employee Assistance Programme Perks at Work benefit platform Opportunities for career development and progression This role is UK remote or Hybrid if you live near our Manchester or Bournemouth's offices. Please only apply if you have the full right to work in the UK. Our Commitment OnBuy is an equal opportunities employer. We are dedicated to creating a fair and transparent workforce, starting with a recruitment process that does not discriminate on the basis of gender, sexual orientation, marital or civil partnership status, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability, or age. Just a heads up - we never use WhatsApp or any messaging apps to contact candidates. If someone reaches out this way, it isn't us and let the recruitment team know.
OnBuy.com
Bournemouth, Dorset
Who are OnBuy? OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed. Working at OnBuy We are a team of driven and motivated people who thrive when working at pace. To succeed at OnBuy you need to take charge and fully own your responsibilities, rolling your sleeves up when needed to 'get it done'. Working at OnBuy you are surrounded by so much opportunity, but you must possess the ability to stay focused and prioritise ruthlessly. Most importantly, you will thrive in an ever-changing environment as we are constantly evolving. At OnBuy, you're not just a number or another cog in a machine. We are creating something really special, and you have the opportunity to affect meaningful change and have your voice heard. We are a close team, who have the opportunity to learn and grow as OnBuy evolves. This is a critical role responsible for building, scaling, and evolving OnBuy's core commerce platform across both front-end and back-end systems. As a Senior Full Stack Engineer, you will own engineering delivery end-to-end; from customer-facing experiences to underlying services and data systems. You will operate within a cross-functional team and be accountable for shipping high-quality, scalable solutions that directly impact GMV, seller performance, and customer experience. This role moves beyond "front-end vs back-end" you are an Engineer responsible for outcomes, not layers. End-to-End Engineering Ownership Design, build, and maintain full-stack solutions across UI, APIs, and backend systems Translate product requirements, designs, and wireframes into scalable, production-ready systems Own features from concept development testing release monitoring Front-End Excellence Build responsive, high-performance user interfaces using modern JavaScript frameworks Translate UI/UX designs into clean, maintainable code Optimise applications for speed, scalability, and usability Back-End & Platform Engineering Design and develop scalable services and APIs Work across monolith and microservices architecture (Laravel / PHP services) Maintain and evolve legacy systems while building modern, scalable architecture Quality & Engineering Standards Own quality to production - testing is embedded, not a phase Write and maintain automated tests (unit, integration, end-to-end) Participate in and lead code reviews to ensure high engineering standards Debug, troubleshoot, and resolve issues across the stack Performance & Scalability Optimise systems for performance, reliability, and scale Work with large-scale data systems (MySQL, NoSQL, search platforms) Identify bottlenecks and proactively improve system efficiency Collaboration & Leadership Work in cross-functional teams with Product, Design, QA, and other Engineers Mentor and support less experienced engineers Communicate technical concepts clearly to non-technical stakeholders Essential Strong full stack engineering experience, owning end-to-end delivery Proven backend expertise in PHP (Laravel) Strong JavaScript (ES6+) skills with modern frameworks (React/Vue/Angular) Experience designing and building RESTful APIs and scalable systems Experience with MySQL and NoSQL databases (e.g. Couchbase, MongoDB) Strong understanding of system architecture and microservices Experience with event-driven systems (e.g. RabbitMQ, Pub/Sub) and cloud environments (GCP) Familiarity with Docker and CI/CD pipelines Strong engineering practices: testing, code quality, and production ownership Desirable Experience in eCommerce or marketplace platforms Cloud experience (GCP) Experience with NoSQL (e.g. Couchbase) and Search platforms (e.g. Constructor & Solr) Experience working in microservices architecture The salary on offer for this role is £65000- £70000 depending on experience. Benefits CompanyEquity- In return for helping us to grow, we'll offer you company equity, meaning you own a piece of this business we are all working so hard to build. 25 days annual leave + Bank Holidays 1 extra day off for your Birthday Employee Assistance Programme Perks at Work benefit platform Opportunities for career development and progression Remote/Hybrid UK remote or if you prefer coming into the office can be Hybrid if you live near our Manchester or Bournemouth's offices. Our Commitment OnBuy is an equal opportunities employer. We are dedicated to creating a fair and transparent workforce, starting with a recruitment process that does not discriminate on the basis of gender, sexual orientation, marital or civil partnership status, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability, or age.
Who are OnBuy? OnBuy are an online marketplace who are on a mission of being the best choice for every customer, everywhere. We have recently been named one of the UK's fastest-growing tech companies in the Sunday Times 100 Tech list. All achievements we are very proud of, but we don't let that go to our head. We are all laser focused on our mission and understand the huge joint effort ahead of us needed to succeed. Working at OnBuy We are a team of driven and motivated people who thrive when working at pace. To succeed at OnBuy you need to take charge and fully own your responsibilities, rolling your sleeves up when needed to 'get it done'. Working at OnBuy you are surrounded by so much opportunity, but you must possess the ability to stay focused and prioritise ruthlessly. Most importantly, you will thrive in an ever-changing environment as we are constantly evolving. At OnBuy, you're not just a number or another cog in a machine. We are creating something really special, and you have the opportunity to affect meaningful change and have your voice heard. We are a close team, who have the opportunity to learn and grow as OnBuy evolves. This is a critical role responsible for building, scaling, and evolving OnBuy's core commerce platform across both front-end and back-end systems. As a Senior Full Stack Engineer, you will own engineering delivery end-to-end; from customer-facing experiences to underlying services and data systems. You will operate within a cross-functional team and be accountable for shipping high-quality, scalable solutions that directly impact GMV, seller performance, and customer experience. This role moves beyond "front-end vs back-end" you are an Engineer responsible for outcomes, not layers. End-to-End Engineering Ownership Design, build, and maintain full-stack solutions across UI, APIs, and backend systems Translate product requirements, designs, and wireframes into scalable, production-ready systems Own features from concept development testing release monitoring Front-End Excellence Build responsive, high-performance user interfaces using modern JavaScript frameworks Translate UI/UX designs into clean, maintainable code Optimise applications for speed, scalability, and usability Back-End & Platform Engineering Design and develop scalable services and APIs Work across monolith and microservices architecture (Laravel / PHP services) Maintain and evolve legacy systems while building modern, scalable architecture Quality & Engineering Standards Own quality to production - testing is embedded, not a phase Write and maintain automated tests (unit, integration, end-to-end) Participate in and lead code reviews to ensure high engineering standards Debug, troubleshoot, and resolve issues across the stack Performance & Scalability Optimise systems for performance, reliability, and scale Work with large-scale data systems (MySQL, NoSQL, search platforms) Identify bottlenecks and proactively improve system efficiency Collaboration & Leadership Work in cross-functional teams with Product, Design, QA, and other Engineers Mentor and support less experienced engineers Communicate technical concepts clearly to non-technical stakeholders Essential Strong full stack engineering experience, owning end-to-end delivery Proven backend expertise in PHP (Laravel) Strong JavaScript (ES6+) skills with modern frameworks (React/Vue/Angular) Experience designing and building RESTful APIs and scalable systems Experience with MySQL and NoSQL databases (e.g. Couchbase, MongoDB) Strong understanding of system architecture and microservices Experience with event-driven systems (e.g. RabbitMQ, Pub/Sub) and cloud environments (GCP) Familiarity with Docker and CI/CD pipelines Strong engineering practices: testing, code quality, and production ownership Desirable Experience in eCommerce or marketplace platforms Cloud experience (GCP) Experience with NoSQL (e.g. Couchbase) and Search platforms (e.g. Constructor & Solr) Experience working in microservices architecture The salary on offer for this role is £65000- £70000 depending on experience. Benefits CompanyEquity- In return for helping us to grow, we'll offer you company equity, meaning you own a piece of this business we are all working so hard to build. 25 days annual leave + Bank Holidays 1 extra day off for your Birthday Employee Assistance Programme Perks at Work benefit platform Opportunities for career development and progression Remote/Hybrid UK remote or if you prefer coming into the office can be Hybrid if you live near our Manchester or Bournemouth's offices. Our Commitment OnBuy is an equal opportunities employer. We are dedicated to creating a fair and transparent workforce, starting with a recruitment process that does not discriminate on the basis of gender, sexual orientation, marital or civil partnership status, pregnancy or maternity, gender reassignment, race, colour, nationality, ethnic or national origin, religion or belief, disability, or age.