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11 senior software engineer jobs found

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senior software engineer £400 - £500
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Outside Spy
Dec 12, 2025
Duration not stated
Senior Software Engineer at Norton Blake, Farringdon, £500 to £550 per Day
£500 - £550 per day
Outside Spy Farringdon, London, UK
Senior Software Engineer, App Experience, Contract, Outside IR35, Remote, My client, a global hospitality brand, is on the search for a Senior Software Engineer to join a cross-functional App Experience team, helping deliver a best-in-class mobile experience and supporting the rollout of a new feature-flag platform. This role will be predominantly backend work using Node, TypeScript and will involve working closely with API’s, updating / refactoring. What you’ll do Build and enhance backend services powering a widely used customer mobile app Ensure applications are performant, scalable, and secure Participate in agile delivery: code reviews, testing, deployments Integrate enterprise systems into custom-built architecture Tech you’ll work with Node.js, JavaScript, TypeScript, React Automated testing: Jest, React Testing Library, MSW, Maestro CI/CD & cloud tools such as Bitrise, GitHub Actions, Cloud Run, Cloud Build, Terraform React Native and...
Outside Spy
Dec 11, 2025
up to 6 Months
Senior Software Engineer, Outside Ir35, Contract, £550 at Norton Blake, England, 3+ Months, £500-£550 per day
£500 - £550 per day
Outside Spy England, UK
Senior Software Engineer, App Experience, Contract, Outside IR35, Remote, My client, a global hospitality brand, is on the search for a Senior Software Engineer to join a cross-functional App Experience team, helping deliver a best-in class mobile experience and supporting the rollout of a new feature-flag platform. This role will be predominantly Back End work using Node, TypeScript and will involve working closely with API's, updating/refactoring. What you'll do Build and enhance Back End services powering a widely used customer mobile app Ensure applications are performant, scalable, and secure Participate in agile delivery: code reviews, testing, deployments Integrate enterprise systems into custom-built architecture Tech you'll work with Node.js, JavaScript, TypeScript, React Automated testing: Jest, React Testing Library, MSW, Maestro CI/CD & cloud tools such as Bitrise, GitHub Actions, Cloud Run, Cloud Build, Terraform React Native and observability...
Outside Spy
Dec 09, 2025
Duration not stated
Senior Software Engineer - 6 Month Contract at Fruition Group, Leeds, £450-£550 per day
£450 - £550 per day
Outside Spy Leeds, UK
Role: Senior Software Engineer - Backend Contract Rate: C.£550 Outside IR35 Per day Location: Leeds - Hybrid (2x days on site) Length: 3-6 months About Us: We are working with a growing, forward-thinking technology company dedicated to building scalable, reliable, and high-performing solutions for our customers. Role Overview: As a Senior Software Engineer, you will be responsible for designing, developing, and maintaining server-side applications and services. You'll work closely with cross-functional teams to ensure our systems are performant, secure, and deliver a great user experience. Key Responsibilities: Design, implement, and maintain backend services, APIs, and databases. Collaborate with product managers, frontend engineers, and other stakeholders to deliver features end-to-end. Ensure systems are scalable, reliable, and maintainable. Write clean, testable, and efficient code following best practices. Requirements: Strong programming skills...
Outside Spy
Dec 09, 2025
6 Months or more
Senior Software Engineer - 6 Month Contract at Fruition Group, Leeds, 6 Months, £450-£550 per day
£450 - £550 per day
Outside Spy Leeds, UK
Role: Senior Software Engineer - Backend Contract Rate: C.£550 Outside IR35 Per day Location: Leeds - Hybrid (2x days on site) Length: 3-6 months About Us: We are working with a growing, forward-thinking technology company dedicated to building scalable, reliable, and high-performing solutions for our customers. Role Overview: As a Senior Software Engineer, you will be responsible for designing, developing, and maintaining Server Side applications and services. You'll work closely with cross-functional teams to ensure our systems are performant, secure, and deliver a great user experience. Key Responsibilities: Design, implement, and maintain Back End services, APIs, and databases. Collaborate with product managers, Front End engineers, and other stakeholders to deliver features end-to-end. Ensure systems are scalable, reliable, and maintainable. Write clean, testable, and efficient code following best practices. Requirements: Strong programming...
Outside Spy
Dec 11, 2025
6 Months or more
Senior .NET Engineer with AWS - 6 Month Contract - Outside IR35 at Reapit Ltd, United Kingdom, 6 Months, £450 per day
£450 per day
Outside Spy United Kingdom
Reapit - Who are we? Reapit is the original, end-to-end business technology provider for estate agencies of all sizes. We've been helping sales and lettings agents to build relationships and grow their businesses for more than 25 years. Our technology connects property professionals in Europe, the Middle East, Australia, and New Zealand with buyers, sellers, tenants and landlords to power the relationships that change lives. In the United Kingdom and Ireland, Reapit's market-leading technology product suite provides estate and lettings agents with powerful tools covering sales, lettings, property management, block management, client accounts and analytics, underpinned by a robust, security infrastructure. Please note - candidates without recent/current AWS will not be considered. What you'll be doing Design and develop scalable, high-performance REST APIs and microservices using C# and .NET Core. Implement cloud-native applications leveraging AWS services including...
Outside Spy
Dec 08, 2025
Duration not stated
Data Product Owner (Pipelines & Modelling) at Toucanberry Tech, Remote, £500 per day
£500 per day
Outside Spy Remote
Toucanberry Tech is a UK-based boutique software consultancy delivering high-impact solutions to the financial sector. We work in agile, cross-functional teams to solve complex challenges with speed, autonomy, and innovation. The Role We are looking for a hands-on Data Product Owner to join our dedicated onshore team. We need someone with a start up mindset who lives and breathes the product, sits side-by-side with our developers, and is passionate about building exceptional backend, data-centric solutions. Key Responsibilities: Owning the end-to-end data lifecycle, from ingestion and transformation through to modelling, analysis, and visualisation. Converting disparate raw data into reliable, structured datasets ready for modelling, analysis, and visual reporting. Managing the product backlog, translating high-level business requirements into clear, actionable user stories. Leading a high-performing squad of engineers and analysts to ensure seamless delivery and...
Outside Spy
Dec 08, 2025
6 Months or more
Data Product Owner (Pipelines & Modelling) at Toucanberry Tech, Remote, £500 per day
£500 per day
Outside Spy Remote
Full job description Toucanberry Tech is a UK-based boutique software consultancy delivering high-impact solutions to the financial sector. We work in agile, cross-functional teams to solve complex challenges with speed, autonomy, and innovation. The Role We are looking for a hands-on Data Product Owner to join our dedicated onshore team. We need someone with a start up mindset who lives and breathes the product, sits side-by-side with our developers, and is passionate about building exceptional backend, data-centric solutions. Key Responsibilities: Owning the end-to-end data lifecycle, from ingestion and transformation through to modelling, analysis, and visualisation. Converting disparate raw data into reliable, structured datasets ready for modelling, analysis, and visual reporting. Managing the product backlog, translating high-level business requirements into clear, actionable user stories. Leading a high-performing squad of engineers...
Outside Spy
Dec 05, 2025
Duration not stated
Data Scientist - Outside of IR35 at Experis, London, £450 to £500 per Day
£450 - £500 per day
Outside Spy London, UK
Our client, a fast growing technology organisation, urgently require an experienced Data Scientist to undertake a long term contract. In order to be successful, you will have the following experience: Strong Data Analyst or Data Science background, with experience within Python and AI/ML technologies Machine learning and Bayesian modelling experience is highly desirable Experience of working with the Home Office as a customer SC Clearance is essential Within this role, you will be responsible for: Analyse structured and unstructured data to extract meaningful insights, trends, and patterns Build, validate, and deploy machine learning models (supervised, unsupervised, and reinforcement learning) in Python to solve complex decision-making problems Develop statistical models and perform hypothesis testing, predictive analytics, and forecasting Work with optimisation and simulation teams to integrate data science models into larger decision engines Collaborate with...
Outside Spy
Dec 05, 2025
Duration not stated
Data Scientist - Outside of IR35 at Experis UK, London, £450-£500 per day
£450 - £500 per day
Outside Spy London, UK
Our client, a fast growing technology organisation, urgently require an experienced Data Scientist to undertake a long term contract. In order to be successful, you will have the following experience: Strong Data Analyst or Data Science background, with experience within Python and AI/ML technologies Machine learning and Bayesian modelling experience is highly desirable Experience of working with the Home Office as a customer SC Clearance is essential Within this role, you will be responsible for: Analyse structured and unstructured data to extract meaningful insights, trends, and patterns Build, validate, and deploy machine learning models (supervised, unsupervised, and reinforcement learning) in Python to solve complex decision-making problems Develop statistical models and perform hypothesis testing, predictive analytics, and forecasting Work with optimisation and simulation teams to integrate data science models into larger decision engines Collaborate with...
Outside Spy
Dec 05, 2025
Duration not stated
Data Scientist - Outside of IR35 at Experis UK, London, £500 per day
£500 per day
Outside Spy London, England, United Kingdom
Our client, a fast growing technology organisation, urgently require an experienced Data Scientist to undertake a long term contract. In order to be successful, you will have the following experience: Strong Data Analyst or Data Science background, with experience within Python and AI/ML technologies Machine learning and Bayesian modelling experience is highly desirable Experience of working with the Home Office as a customer SC Clearance is essential Within This Role, You Will Be Responsible For Analyse structured and unstructured data to extract meaningful insights, trends, and patterns Build, validate, and deploy machine learning models (supervised, unsupervised, and reinforcement learning) in Python to solve complex decision-making problems Develop statistical models and perform hypothesis testing, predictive analytics, and forecasting Work with optimisation and simulation teams to integrate data science models into larger decision engines...
Outside Spy
Dec 05, 2025
6 Months or more
Data Scientist - Outside of IR35 at People Source Consulting Ltd, London, 6 Months, £450-£500 per day
£450 - £500 per day
Outside Spy London, UK
Our client, a fast growing technology organisation, urgently require an experienced Data Scientist to undertake a long term contract. In order to be successful, you will have the following experience: Strong Data Analyst or Data Science background, with experience within Python and AI/ML technologies Machine learning and Bayesian modelling experience is highly desirable Experience of working with the Home Office as a customer SC Clearance is essential Within this role, you will be responsible for: Analyse structured and unstructured data to extract meaningful insights, trends, and patterns Build, validate, and deploy machine learning models (supervised, unsupervised, and reinforcement learning) in Python to solve complex decision-making problems Develop statistical models and perform hypothesis testing, predictive analytics, and forecasting Work with optimisation and simulation teams to integrate data science models into larger decision engines Collaborate with...
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