23 senior software engineer jobs found in London

Contract Senior Full Stack Software Engineer : Up to £475 Outside IR35 : Hybrid London : 3 months (rolling) We're looking for a Contract Senior Full Stack Engineer to join a rapidly growing cosnutlancies exciting end client. As a Contract Senior Full Stack Software Engineer, you will design and build new features, improve architecture and performance and streamline development workflows, In addition you will ensure code quality, reliability, and security across their systems. Key Skills: Java, Spring Boot TypeScript, React.js Azure, CI/CD, IaaS, DevSecOps Pensions/Retirements experience (bonds & trading) Contract Details: Up to £475 per day, Outside IR35 3 months (rolling) Hybrid London This is an exciting opportunity for an experienced developer to apply their expertise in a fast-moving environment, shaping technologies that directly impact Real Time projects. Please note: Due to the high volume of applications, unfortunately, we may not be...

Contract Opportunity – Senior Software Engineer (C++) | £650/day | Outside IR35 | West London | 6 months Role: Senior Software Engineer IR35: Outside Duration: 6 months Rate: £650 Location: London - 3 day onsite We’re partnered with an AI start-up that’s developed a novel machine learning foundation model capable of fully automating Software with no supervision, no debugging, instantly deployable. Hiring their first dedicated Lead Software Engineer to shape the architecture, define technical direction, and build the backbone of a truly game-changing product. The role: Hands-on C++ engineering, Python Engineering Backend systems, infrastructure & cloud architecture (Optional) Exposure to ML frameworks & applied AI Direct influence on key technical and product decisions Software Engineer | C++ | Python | IR35 | ML

Senior Software Engineer (React/Node/React Native) - Contract - £575 per day (Outside IR35) Leading Ecommerce client now requires a talented ‘Full Stack JavaScript Developer’ who is proficient in front/back-end and mobile development. (React/Node.js/React Native). This role will be joining their engineering team, developing new travel systems and requirements for our client’s web and mobile applications. What will a day in the role entail? Working as an integral part of an agile team contributing towards the planning and development of systems/platforms. Collaborating with engineers, product owners and business analysts to define solutions, ways of working and share knowledge across the department. Reviewing code and providing support to members of your team. Working on client-facing applications in react/next.js Designing and building Node.js/GraphQL APIs. The ideal Senior JavaScript Developer: Senior level experience in modern JavaScript, written with...

Senior Software Engineer (React/Node/React Native) - Contract - £575 per day (Outside IR35) Leading Ecommerce client now requires a talented ‘Full Stack JavaScript Developer’ who is proficient in front/back-end and mobile development. (React/Node.js/React Native). This role will be joining their engineering team, developing new travel systems and requirements for our client’s web and mobile applications. What will a day in the role entail? Working as an integral part of an agile team contributing towards the planning and development of systems/platforms. Collaborating with engineers, product owners and business analysts to define solutions, ways of working and share knowledge across the department. Reviewing code and providing support to members of your team. Working on client-facing applications in react/next.js Designing and building Node.js/GraphQL APIs. The ideal Senior JavaScript Developer: Senior level experience in modern JavaScript, written with...

Senior Software Engineer (React/Node/React Native) - Contract - £575 per day (Outside IR35) Leading Ecommerce client now requires a talented ‘Full Stack JavaScript Developer’ who is proficient in front/back-end and mobile development. (React/Node.js/React Native). This role will be joining their engineering team, developing new travel systems and requirements for our client’s web and mobile applications. What will a day in the role entail? Working as an integral part of an agile team contributing towards the planning and development of systems/platforms. Collaborating with engineers, product owners and business analysts to define solutions, ways of working and share knowledge across the department. Reviewing code and providing support to members of your team. Working on client-facing applications in react/next.js Designing and building Node.js/GraphQL APIs. The ideal Senior JavaScript Developer: Senior level experience in modern JavaScript, written with...

Senior Software Engineer (React/Node/React Native) - Contract - £575 per day (Outside IR35) Leading Ecommerce client now requires a talented Full Stack JavaScript Developer' who is proficient in front/Back End and mobile development. (React/Node.js/React Native). This role will be joining their engineering team, developing new travel systems and requirements for our client's web and mobile applications. What will a day in the role entail? Working as an integral part of an agile team contributing towards the planning and development of systems/platforms. Collaborating with engineers, product owners and business analysts to define solutions, ways of working and share knowledge across the department. Reviewing code and providing support to members of your team. Working on client-facing applications in react/next.js Designing and building Node.js/GraphQL APIs. The ideal Senior JavaScript Developer: Senior level experience in modern JavaScript, written with...

CONTRACT SENIOR SOFTWARE ENGINEER - eDV CLEARED NEW CONTRACT JOB OPPORTUNITY AVAILABLE WITHIN A LEADING NATIONAL SECURITY COMPANY FOR A SENIOR SOFTWARE ENGINEER WITH eDV CLEARANCE Contract job opportunity for a Senior Software Engineer Globally leading defence / cyber security company £500 - £750 per day (inside and outside IR35 roles available) London based organisation in an easily accessible location Contract Senior Software Engineer To apply please call or email WHO WE ARE? We are recruiting multiple contract Senior Software Engineers to work with various clients in London ranging from R &D companies, Multi-National Consultancies to SME 's and product based companies. Due to the nature of the work these clients do, you must hold enhanced DV Security Clearance. WHAT WILL THE SENIOR SOFTWARE ENGINEER BE DOING? As a Senior Software Engineer, you will work with an experienced agile team to design and deliver...

Contract Senior Full Stack Software Engineer : Up to £500 Outside IR35 : Monthly Hybrid London : 6 months (rolling) A digital consulting partner of ours are looking for a Contract Senior Full Stack Software Engineer to design, build, and maintain scalable, high-performance software systems for their end customer. As a Contract Senior Full Stack Software Engineer you will lead technical decision-making by reviewing designs, mentoring engineers, and driving best practices in code quality, architecture, and tooling. Key Skills: Angular, Java, Node.js MuleSoft Cloud experience (AWS, Azure, GCP) Contract Details: Up to £500 per day, Outside IR35 6 months (rolling) Monthly Hybrid London This is an exciting opportunity for an experienced developer to apply their expertise in a fast-moving environment, shaping technologies that directly impact real time projects. Please note: Due to the high volume of applications, unfortunately, we may not be able...

Contract Senior Full Stack Software Engineer : Up to £500 Outside IR35 : Monthly Hybrid London : 6 months (rolling) A digital consulting partner of ours are looking for a Contract Senior Full Stack Software Engineer to design, build, and maintain scalable, high-performance software systems for their end customer. As a Contract Senior Full Stack Software Engineer you will lead technical decision-making by reviewing designs, mentoring engineers, and driving best practices in code quality, architecture, and tooling. Key Skills: Angular, Java, Node.js MuleSoft Cloud experience (AWS, Azure, GCP) Contract Details: Up to £500 per day, Outside IR35 6 months (rolling) Monthly Hybrid London This is an exciting opportunity for an experienced developer to apply their expertise in a fast-moving environment, shaping technologies that directly impact Real Time projects. Please note: Due to the high volume of applications, unfortunately, we may not be able to...

Contract Fullstack Software Engineer | GO/Python/ReactJS | £600-£800/day | Outside IR35 Senior Fullstack Software Engineer (Backend weighted) 💸 £600-£800/day pay rate 📅 Initial 6 Month Duration 🖊️ Outside IR35 Contract Determination 📍 Hybrid - Central London (3 days a week) 🤖 Well funded biotech scale up Technical Environment - GO/Python backend, Kubernetes, Docker, Event-Driven, microservices architecture with a Reactjs front end. We are partnered with a well-funded scale up in the BioTech sector who are developing software to support autonomous robotics. They are building cutting edge, fully customisable, autonomous technology to support critical workflows, enhancing efficiency, reducing errors and reducing workload. You'll join a new squad tasked with building platform features that enable customers to develop and execute their scientific workflows. You'll work at the intersection of backend, cloud, and frontend...

Our client is a rapidly growing, London-headquartered oil derivatives trading house with significant market presence in global energy markets. They operate a dynamic, entrepreneurial trading environment with substantial annual trading volumes The business is experiencing fast growth and requires a hands-on Senior DevOps Engineer (Contract). Senior DevOps Engineer (Contract) London – 5 days onsite Contract Type: Outside IR35, 6 month initial term with extension potential Job Responsibilities Lead the design and architecture of complex, scalable software solutions, applying innovative and forward-thinking approaches to technical challenges. Establish technical direction and best practices for secure, high-quality production code across the organization. Drive strategic automation initiatives to proactively identify and remediate recurring issues, significantly enhancing operational stability and system reliability. Architect and standardize containerization...

Contract Senior Full Stack Software Engineer : Up to £450 Outside IR35 : Hybrid London : 3 months (rolling) We’re looking for a Contract Senior Full Stack Engineer to join a rapidly growing cosnutlancies exciting end client. As a Contract Senior Full Stack Software Engineer, you will design and build new features, improve architecture and performance and streamline development workflows, In addition you will ensure code quality, reliability, and security across their systems. Key Skills: Java, Spring Boot TypeScript, React.js Azure, CI/CD, IaaS, DevSecOps Contract Details: Up to £450 per day, Outside IR35 3 months (rolling) Hybrid London This is an exciting opportunity for an experienced developer to apply their expertise in a fast-moving environment, shaping technologies that directly impact real time projects. Please note: Due to the high volume of applications, unfortunately, we may not be able to provide feedback to all applicants....

CONTRACT DATA ENGINEER - eDV CLEARED NEW OUTSIDE IR35 CONTRACT OPPORTUNITY AVAILABLE WITHIN A LEADING NATIONAL SECURITY SME FOR A DATA ENGINEER WITH eDV CLEARANCE Contract job opportunity for a Data Engineer National Security client Palantir Foundry Outside IR35 Central London based organisation in an easily accessible location To apply please call / or email WHO WE ARE? We are recruiting a contract Data Engineer to work with a National Security SME in central London. Due to the nature of the work, you must hold enhanced DV Clearance. WE NEED THE DATA ENGINEER TO HAVE .... Current enhanced DV Security Clearance Experience with big data tools such as Hadoop, Cloudera or Elasticsearch Experience With Palantir Foundry Experience working in an Agile Scrum environment with tools such as Confluence / Jira Experience in design, development, test and integration of software Willingness to learn new technologies...

🚀 Senior Front-End Engineer – Investment Banking |£750 p/d (Outside IR35) | London / Hybrid (1 Day/Week in Office) We are partnering with a global investment bank to hire a Senior Front-End Engineer to join a flagship team delivering a next-generation, single-page application (SPA) platform for high-performance derivatives trading. This is a high-profile role on a mission-critical, front-office system with exceptional technical standards. You’ll work at the cutting edge of financial technology, contributing to a modern, reactive web platform used across trading desks. This is not your typical enterprise UI, it’s fast, data-intensive, and built to scale with real-time demands in a trading environment. 💼 The Opportunity Collaborate with elite engineers on a SPA used across the investment bank for derivatives trading. Build elegant, high-performance UIs with real-time data updates and functional programming paradigms. Shape a front-end architecture trusted...

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...

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...

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...

Role: Staff Software Engineer Sector: Life Sciences Location: London Days Onsite: 3 per week Day Rate: £600 to £800 Outside IR35 Duration: 4 Months then to extend or go Permanent iO Associates have partnered with Life Science Manufacturing company on their search for a Staff Software Engineer who has a strong background in integrating Medical Devices click apply for full job details

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...

A global investment firm is hiring an AI Engineer who has experience with Python, PyTorch, HuggingFace, and cloud ML deployment. Hybrid position. Paying up to £2000 per day Role and responsibilities for the AI Engineer Build ML and intelligent systems that enhance decision-making and optimize internal workflows Design foundational infrastructure and tooling for scalable AI/ML deployment Develop search systems using retrieval-augmented generation (RAG) and LLMs Deploy real-world solutions using large language models and cloud platforms (AWS, Azure, or GCP) Collaborate with data and investment teams to identify high-value opportunities Drive AI adoption firm-wide, reducing vendor dependencies and enabling self-service Evangelize AI internally, building awareness, excitement, and engagement across teams Experience and skills required for the AI Engineer 8 years of experience in software engineering with a strong ML focus Bachelor's in Computer...