117 senior software engineer jobs found

Senior Software Engineer Europe (Remote) Full‑time contractor role (rolling 12‑month contract).   About TxODDS TXODDS is a premier provider of ultra low-latency, accurate odds data, fast scores, and innovative betting solutions for the global sports betting industry. With offices in London, Chicago, and Belgrade - and team members working worldwide - we deliver cutting-edge technology and data products that power some of the world’s top sportsbooks.   About the Role We’re looking for a Senior Software Engineer to join our Data Acquisition team. This is a key role in building and maintaining the systems that power our real‑time data delivery. You’ll work closely with cross‑functional teams to ensure the accuracy, reliability, and speed of the data we provide to customers. This is a great opportunity for someone with 5+ years of experience who enjoys working in a fast‑moving, highly collaborative engineering...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Emphasis on Architecture over Development (Must have a solid Development Background) Must be comfortable sitting in client meetings and advising Start date ASAP Duration 3 months (Likely to extend) 3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of ʺtech cityʺ...

Mindera is looking for a Java Engineer with hands-on experience in OpenTelemetry (OTEL) to join our backend engineering team. You’ll play a key role in designing, building, and instrumenting high-performance Java services. Requirements Design, develop, and maintain scalable Java-based microservices and backend systems. Implement observability best practices using OpenTelemetry (OTEL) for tracing, metrics, and logging. Collaborate with platform and DevOps teams to integrate telemetry data with systems such as Grafana, Prometheus, Jaeger, or Tempo . Define and maintain instrumentation standards across Java applications to ensure consistency and performance visibility. Diagnose complex production issues through telemetry data and performance profiling. Contribute to architectural discussions on service design, distributed systems, and monitoring strategy. Write clean, efficient, and testable code following best practices in CI/CD and...

We're looking to hire 5 Senior Ruby Software Engineers for a number of business critical projects. 3 month initial contract, may extend Fully remote Outside IR35 Immediate start About Us At Henry Schein One UK, we are a tech company with a mission to redefine dental care, creating a future where personalised, AI-driven treatment and intelligent practice management come together to enhance patient care and build a thriving dental practice. We’re innovators, relentless in our pursuit of customer success and constantly pushing the boundaries of the possible to create world-class SaaS products. Culture matters to us. Celebrated as one of the ‘Sunday Times UK's Best Places to Work’ companies, our culture as an inclusive and forward-thinking company means we are committed to creating an environment that values diversity and flexibility and promotes equal opportunities for everyone. What We Do Tech for...

Senior Software Engineer Europe (Remote) Full‑time contractor role (rolling 12‑month contract).   About TxODDS TXODDS is a premier provider of ultra low-latency, accurate odds data, fast scores, and innovative betting solutions for the global sports betting industry. With offices in London, Chicago, and Belgrade - and team members working worldwide - we deliver cutting-edge technology and data products that power some of the world’s top sportsbooks.   About the Role We’re looking for a Senior Software Engineer to join our Data Acquisition team. This is a key role in building and maintaining the systems that power our real‑time data delivery. You’ll work closely with cross‑functional teams to ensure the accuracy, reliability, and speed of the data we provide to customers. This is a great opportunity for someone with 5+ years of experience who enjoys working in a fast‑moving, highly collaborative engineering...

Freelance Senior Software Engineer - £day rate (outside IR35) Joining an enterprise project in production phase Project is integration multiple 3rd party services into a financial services platform.  Looking for front end (React Native) or Back end (.net) experience (Or both) Start date ASAP Duration 3 months (Likely to extend) 2 days / week in person working (London) Joining a cross functional team of 12 Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We’ve been consistently profitable and have grown responsibly from the...

TL;DR We're looking to hire 5 Senior Ruby Software Engineers for a number of business critical projects. 3 month initial contract, may extend Fully remote Outside IR35 Immediate start About Us At Henry Schein One UK, we are a tech company with a mission to redefine dental care, creating a future where personalised, AI-driven treatment and intelligent practice management come together to enhance patient care and build a thriving dental practice. We’re innovators, relentless in our pursuit of customer success and constantly pushing the boundaries of the possible to create world-class SaaS products. Culture matters to us. Celebrated as one of the ‘Sunday Times UK's Best Places to Work’ companies, our culture as an inclusive and forward-thinking company means we are committed to creating an environment that values diversity and flexibility and promotes equal opportunities for everyone. What We Do...

Mindera is looking for a Java Engineer with hands-on experience in OpenTelemetry (OTEL) to join our backend engineering team. You’ll play a key role in designing, building, and instrumenting high-performance Java services. Requirements Design, develop, and maintain scalable Java-based microservices and backend systems. Implement observability best practices using OpenTelemetry (OTEL) for tracing, metrics, and logging. Collaborate with platform and DevOps teams to integrate telemetry data with systems such as Grafana, Prometheus, Jaeger, or Tempo . Define and maintain instrumentation standards across Java applications to ensure consistency and performance visibility. Diagnose complex production issues through telemetry data and performance profiling. Contribute to architectural discussions on service design, distributed systems, and monitoring strategy. Write clean, efficient, and testable code following best practices in CI/CD and...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Emphasis on Architecture over Development (Must have a solid Development Background) Must be comfortable sitting in client meetings and advising Start date ASAP Duration 3 months (Likely to extend) 3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of ʺtech cityʺ...

Senior Software Engineer - Identity & Authentication (Backend) - Contractor About the Role In the European Client Identity team, we are building and operating Vanguard’s authentication and MFA platform used by hundreds of thousands of clients across the UK and Europe. This is a hands-on senior backend role focused on designing, building, deploying, and operating cloud-based identity services. You will work in a highly regulated environment where security, reliability, and operational discipline matter. You don’t need to be an identity expert on day one — but you do need strong backend fundamentals, cloud experience, and a responsible, methodical engineering mindset.   This is a contractor role, available for up to 12-months.   In this role you will Build and evolve backend services that support login, MFA , and client authentication Design and implement REST APIs using NestJS / TypeScript...

Senior Software Engineer - Identity & Authentication (Backend) - Contractor About the Role In the European Client Identity team, we are building and operating Vanguard’s authentication and MFA platform used by hundreds of thousands of clients across the UK and Europe. This is a hands-on senior backend role focused on designing, building, deploying, and operating cloud-based identity services. You will work in a highly regulated environment where security, reliability, and operational discipline matter. You don’t need to be an identity expert on day one — but you do need strong backend fundamentals, cloud experience, and a responsible, methodical engineering mindset.   This is a contractor role, available for up to 12-months.   In this role you will Build and evolve backend services that support login, MFA , and client authentication Design and implement REST APIs using NestJS / TypeScript...

About The Department Our Cars business is one of the cornerstones of the connected trip. We aim to offer the best and most convenient car rental and ground transport options to every customer – whether they start their trip by booking a car or complement an existing journey with one. We do this by delivering a best-in-class user experience and building products that remove friction from finding, comparing, and booking the right car, at the right time, for every kind of traveller. Cars Content Experience (CCX) Team The Cars Content Experience (CCX) team focuses on how content and user-generated feedback build trust, reassurance, and confidence throughout the Cars journey at Booking.com. We look after user-generated content (UGC) in the Cars vertical and the key content experiences that support discovery, comparison, and booking – from post-trip feedback and ratings to pre-book information that helps customers choose the right car for their needs. The team is...

Contract Senior Software Engineer (React/Node) Location: Remote in Europe Department: Engineering Employment: Contract (B2B)   About YLD: Our goal is to help our clients keep moving forward. We work with them to build the skills and capabilities they need to stay ahead of the competition, and we know our success only happens when they succeed. We’re a team of curious, talented people, and we’re committed to making YLD a place where great people want to work, grow, and stay. We’re a remote-first consultancy specialising in software engineering, product design, and data. Our teams are based across London, Lisbon, and Porto, and we create digital solutions that continue to deliver value long after our work is done.   About the role: As a Senior Software Engineer at YLD, you’ll be part of a client team building innovative products. We’re looking for someone curious, passionate, driven, and...

Joining a new project Ideally have worked on Financial Services Projects before (Payments would be great) Emphasis on Architecture over Development (Must have a solid Development Background) Must be comfortable sitting in client meetings and advising Start date ASAP Duration 3 months (Likely to extend) 3 days / week in person working (London) Immediate Interviews   The best bit about Red Badger is, of course, the team. We are really proud of our people; we support and learn a lot from each other; we work really hard but have fun doing it. We are a diverse group made up of 22 different nationalities, speaking 17 different languages.   Our 3 founders, Dave, Cain and Stu, who have considerable tech and consultancy experience and still own 100% of the company. We've been consistently profitable and have grown responsibly from the beginning.   We are based at Old Street in the heart of ʺtech cityʺ...

Must have skills: Demonstrable experience with Solidity. Strong understanding of blockchain security practices and potential vulnerabilities. Proficiency in Hardhat and Foundry. Experience with Solidity security testing tools like Slither, Mythril, Echidna Practical experience with scripting languages like Javascript or Typescript. Ability to craft unit, integration, fork, and invariant tests, ensuring code longevity. Demonstrable aptitude for best development practices, data structures, algorithms, and methodologies. Bachelor's degree in Computer Science, Engineering, or a related STEM discipline. Excellent debugging and troubleshooting skills. Strong written and verbal communication skills. Self-motivated with the ability to work in a fast-paced, evolving environment. Proficient communication skills in English. Development background in sectors such as banking, finance, or trading, paired with a comprehensive grasp of financial instruments and systems. Bonus...

Company Description General Dynamics Mission Systems engineers a diverse portfolio of high technology solutions, products and services that enable customers to successfully execute missions across all domains of operation. With a global team of more than 13,000 top professionals, we partner with the best in industry to expand the bounds of innovation in the defence and scientific arenas. In the UK, we are leading the way in avionics and communication systems. Given the nature of our work and who we are, we value trust, honesty, alignment and transparency. General Dynamics in St Leonards-on-Sea currently provide avionic mission computing systems for a wide range of military fast jets, helicopters, and UAV’s. Recent success has resulted in General Dynamics developing the next generation of Advanced High Performance, Safety Critical Mission Computer Systems to meet the needs of latest platforms in development by several aircraft manufacturers. These Mission...

Must have skills: Demonstrable experience with Solidity. Strong understanding of blockchain security practices and potential vulnerabilities. Proficiency in Hardhat and Foundry. Experience with Solidity security testing tools like Slither, Mythril, Echidna Practical experience with scripting languages like Javascript or Typescript. Ability to craft unit, integration, fork, and invariant tests, ensuring code longevity. Demonstrable aptitude for best development practices, data structures, algorithms, and methodologies. Bachelor's degree in Computer Science, Engineering, or a related STEM discipline. Excellent debugging and troubleshooting skills. Strong written and verbal communication skills. Self-motivated with the ability to work in a fast-paced, evolving environment. Proficient communication skills in English. Development background in sectors such as banking, finance, or trading, paired with a comprehensive grasp of financial instruments and systems. Bonus...

We are seeking a passionate Software Engineering Manager who will provide technical expertise and operate with excellence. Being creative, curious, and confident, you will be an integral part of our empowered, self-managing, multi-disciplinary engineering teams - designing, building, releasing, and maintaining products. You will play a key role in driving our ambition to create a best-in-class software engineering team, environment, and culture. This is an initial 6 month contract (outside IR35) that requires you to work on client site 3 days a week in London, Paddington. Requirements   Your key accountabilities will include: Team Management: Build, mentor, and manage a high-performing software engineering team. Foster a culture of collaboration, innovation, and continuous improvement within the team. Facilitate communication and collaboration among team members. Ensure budgets, people and resource allocation, and workload, balance across...

We are seeking a passionate Software Engineering Manager who will provide technical expertise and operate with excellence. Being creative, curious, and confident, you will be an integral part of our empowered, self-managing, multi-disciplinary engineering teams - designing, building, releasing, and maintaining products. You will play a key role in driving our ambition to create a best-in-class software engineering team, environment, and culture. This is an initial 6 month contract (outside IR35) that requires you to work on client site 3 days a week in London, Paddington. Requirements   Your key accountabilities will include: Team Management: Build, mentor, and manage a high-performing software engineering team. Foster a culture of collaboration, innovation, and continuous improvement within the team. Facilitate communication and collaboration among team members. Ensure budgets, people and resource allocation, and workload, balance across...

We are seeking a passionate Software Engineering Manager who will provide technical expertise and operate with excellence. Being creative, curious, and confident, you will be an integral part of our empowered, self-managing, multi-disciplinary engineering teams - designing, building, releasing, and maintaining products. You will play a key role in driving our ambition to create a best-in-class software engineering team, environment, and culture. This is an initial 6 month contract (outside IR35) that requires you to work on client site 3 days a week in London, Paddington. Requirements   Your key accountabilities will include: Team Management: Build, mentor, and manage a high-performing software engineering team. Foster a culture of collaboration, innovation, and continuous improvement within the team. Facilitate communication and collaboration among team members. Ensure budgets, people and resource allocation, and workload, balance across...