1 to 25 of 38 Permanent Senior Software Engineer Jobs in Essex

the mentoring of code reviews as part of the development process. Produce high quality code with minimal defects. Update job knowledge by researching new internet/intranet technologies and software products; participating in educational opportunities; reading professional publications; maintaining personal networks; participating in professional organizations. Regularly communicate with the business to complete requirements analysis, design, and development work. Participate … value to job accomplishments. Participate in efforts to help team achieve yearly business and technical goals. Become a subject matter expert on one or more areas of functionality. Recommend software solutions and tools by comparing advantages and disadvantages of custom development and purchase alternatives. Integrate applications by designing database architecture, establishing connectivity with network systems and web servers. Perform … other job-related duties as assigned by Managers(s). What You'll Need Bachelor's degree in Information Systems, Computer Science, software engineering, or mathematics. Possess an understanding of business management. 8+ years of software programming experience. Advanced proficiency in Python and/or C# along with a good working knowledge of JavaScript. Extensive experience with modern More ❯

Job Description: Senior Software Engineer Tech Stack: C#, .NET, Microservices, Docker, Kubernetes, AWS/Azure United Kingdom Full Remote: Perm Role Salary: £85,000 - £110,000 Harrington Starr has partnered with an innovative start up FinTech who specialise in providing market access and data from their ultra low-latency platform to financial service firms, leading exchanges and … single dealers across digital assets, FIX and more. They are looking to hire a Senior C#, .NET Engineer with strong experience in start-up/scale up firms, able to take ownership of developing new applications, adding features to existing systems and contributing to the growth and success of the companies core products. Key Requirements: Extensive C#, .NET … confidential phone call to discuss this opportunity in further detail, please apply below or send through a copy of your up-to-date CV via email to [emailprotected] . Senior Software Engineer Tech Stack: C#, .NET, Microservices, Docker, Kubernetes, AWS/Azure United Kingdom Full Remote: Perm Role Salary: £85,000 - £110,000 Harrington Starr has partnered More ❯

Senior Software Engineer (JavaScript) ?? Colchester - Hybrid (2 days in-office, your choice) ?? £40,000 - £50,000 + flexible hours + award-winning culture Are you a strong JavaScript developer who's ready to take the next step into leadership? We're working with an award-winning Colchester-based business that partners with household name global clients , and … they're looking for a Senior Software Engineer to help lead their talented dev team. Why this role? Flexible working hours - work to your own rhythm, just be contactable between 10am and 4pm. Hybrid working - in the office just two days a week (you choose which ones). Step into leadership - lead a team of 5 developers … talented developers Supporting and mentoring junior team members Getting involved in architecture and sprint planning Innovating and contributing to tech strategy Building scalable systems for major global brands Senior Software Engineer (JavaScript) ?? Colchester - Hybrid (2 days in-office, your choice) ?? £40,000 - £50,000 + flexible hours + award-winning culture Oscar Associates (UK) Limited is acting More ❯

Social network you want to login/join with: ? Urgent! x8 Fullstack Senior Software Engineers/Tech leads Needed – UK-based – – Rapid Growth – Fully Remote ?, colchester col-narrow-left Client: Location: colchester, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 4 Posted: 07.06.2025 Expiry Date: 22.07.2025 col-wide Job Description: ? Urgent … x8 Fullstack Senior Software Engineers/Tech leads Needed – UK-based – – Rapid Growth – Fully Remote ? Areti Group is excited to partner with a Series funded startup poised for rapid expansion, growing by 40 heads in the next 3 months! We are urgently seeking x8 Fullstack Tech leads to join their high-performing team. This fully remote role offers … embracing new tech. Languages : ? Ruby-on-Rails, Java, Python, C#, PHP ? VueJs, Typescript/Angular/React Cloud : ? Amazon Web Services (AWS) Databases : Additional Tools & Frameworks : ? GraphQL ? REST APIs ? Software Design Patterns – TDD, DDD ? Agile methodologies: Scrum and Kanban Key Responsibilities : Full-Stack Development : Design, develop, and maintain complex full-stack applications across both front-end and back-end. More ❯

Job Description: C# Software Engineer (Senior/Principal) The Opportunity Are you a Software Engineer with C# experience looking for your next challenge? Here at Leonardo, we are on the hunt for talented software engineers to support our Integrated Sensors & Protection line of business, working on a range of defence projects. Direct industry experience … is not required; we are happy to explore all backgrounds and help develop our software engineers. What you will do: We want to develop a new generation of features and capabilities using innovative software solutions. You will be a key part of a community of world-class software engineers who will continuously improve, collaborate, and innovate to … create market-leading products within the defence industry. What we are looking for: Essential C# software development Machine-to-machine networking, working to third-party interface definitions Test frameworks and test development (not test-driven development) Microservices architecture/containerisation (development of containerised plugins, with potential to replace existing components) CUDA integration (AI/ML) Development of new applications More ❯

C# Software Engineer (Senior/Principal) Apply Locations: GB - Basildon Time Type: Full time Posted on: Posted Yesterday Job Requisition ID: R Job Description: The Opportunity Are you a Software Engineer with C# experience looking for your next challenge? Here at Leonardo, we are on the hunt for talented software engineers to support our … Protection line of business, working on a range of defence projects. Direct industry experience is not required; we are happy to explore all backgrounds and help develop all our software engineers. What you will do: You will be a key part in a community of world-class software engineers who will continuously improve, collaborate and innovate with other … engineers to create market-leading products within the defence industry. What we are looking for: Essential: C# software development Machine-to-machine networking, working to third-party interface definitions Test frameworks and test development (not test-driven development) Microservices architecture/containerisation CUDA integration (AI/ML) Development of new applications to meet user expectations and within formal constraints. More ❯

hackajob is collaborating with Leonardo to connect them with exceptional tech professionals for this role. C# Software Engineer (Senior/Principal) The Opportunity Are you a Software Engineer with C# experience looking for your next challenge? Here at Leonardo, we are on the hunt for talented software engineers to support our Integrated Sensors & Protection … line of business, working on a range of defence projects. Direct industry experience is not required; we are happy to explore all backgrounds and help develop all our software engineers. What you will do: We want to develop a new generation of features and capabilities using innovative software solutions. You will be a key part of a community … of world-class software engineers who will continuously improve, collaborate, and innovate to create market-leading products within the defence industry. What we are looking for: Essential C# software development Machine-to-machine networking, working to third-party interface definitions Test frameworks and test development (not test-driven development) Microservices architecture/containerisation (funding available; development of containerised More ❯

Search designed for next-generation AI applications. Our platform enables high-performance vector similarity search, allowing businesses to unlock deep insights from unstructured data. By offering both open-source software and managed cloud solutions, we empower developers and enterprises to build scalable, AI-driven search and recommendation systems with ease. Our offering runs on major cloud providers in regions … worldwide. Tasks We are seeking a talented and product-minded Senior Backend Engineer with strong expertise in building resilient systems as well as having a good understanding in how to make them accessible. While expertise in vector databases is not required for this role, we highly value experience in billing and payments, where handling complex transactions at scale … is a critical challenge. As a Senior Software Engineer (Payments), you will design, build, and maintain robust backend systems. The main focus of your work will be related to billing and payments, which is: precise usage metering, PSP integrations, sales and backoffice extension, reporting among others. You will work in a small multidisciplinary team and collaborate transversally More ❯

We are currently partnered with an established and growing financial services company, regulated by the FCA, that has an exciting opportunity for an experienced Senior Full Stack Web Developer to join their in-house development team. This company has a proven track record for customer and employee satisfaction and is looking for an extremely driven, passionate, and motivated individual More ❯

Social network you want to login/join with: Senior Software Engineer - AI Fintech Product Company - FULLY REMOTE IN UK - £120k - TypeScript/Python/React/AWS/GenAI, basildon col-narrow-left Client: Opus Recruitment Solutions Location: basildon, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 4 Posted … 31.05.2025 Expiry Date: 15.07.2025 col-wide Job Description: I am supporting a FinTech AI Product Company who are on the hunt for an experienced Senior Software Engineer to join their FULLY REMOTE engineering team! They are a heavily tech driven Product Company who put a huge emphasis on quality engineering, innovation and forward thinking. As a Senior Software Engineer, you will work closely with their CTO and play a very important role on the direction of the product! You'll support with key tech decisions, architecture, project delivery and mentoring other Engineers in the team. Requirements: Deep experience with Python, TypeScript, React, AWS, PostgreSQL, and GenAI + Any experience with any other backend languages More ❯

Social network you want to login/join with: Senior Software Engineer - AI Fintech Product Company - FULLY REMOTE IN UK - £120k - TypeScript/Python/React/AWS/GenAI, colchester col-narrow-left Client: Opus Recruitment Solutions Location: colchester, United Kingdom Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 4 Posted … 31.05.2025 Expiry Date: 15.07.2025 col-wide Job Description: I am supporting a FinTech AI Product Company who are on the hunt for an experienced Senior Software Engineer to join their FULLY REMOTE engineering team! They are a heavily tech driven Product Company who put a huge emphasis on quality engineering, innovation and forward thinking. As a Senior Software Engineer, you will work closely with their CTO and play a very important role on the direction of the product! You'll support with key tech decisions, architecture, project delivery and mentoring other Engineers in the team. Requirements: Deep experience with Python, TypeScript, React, AWS, PostgreSQL, and GenAI + Any experience with any other backend languages More ❯

Social network you want to login/join with: Senior Software Engineer - AI Fintech Product Company - FULLY REMOTE IN UK - £120k - TypeScript/Python/React/AWS/GenAI, chelmsford col-narrow-left Client: Opus Recruitment Solutions Location: Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 4 Posted: 31.05.2025 Expiry Date … 15.07.2025 col-wide Job Description: I am supporting a FinTech AI Product Company who are on the hunt for an experienced Senior Software Engineer to join their FULLY REMOTE engineering team! They are a heavily tech driven Product Company who put a huge emphasis on quality engineering, innovation and forward thinking. As a Senior Software Engineer, you will work closely with their CTO and play a very important role on the direction of the product! You'll support with key tech decisions, architecture, project delivery and mentoring other Engineers in the team. Requirements: Deep experience with Python, TypeScript, React, AWS, PostgreSQL, and GenAI + Any experience with any other backend languages: Go, Elixir More ❯

Social network you want to login/join with: An excellent opportunity awaits an experienced software developer with strong .NET and React skills to join a leading software company in a role offering strong technical variety, ongoing development opportunities, and involvement in genuinely interesting projects. This company builds innovative software and data management systems that support critical … decision-making in sectors such as environmental monitoring, infrastructure, and energy. In this role you'll join as a senior member of the development team, taking a hands-on role in the full lifecycle of a specialist management platform. You’ll help shape the product’s technical direction, mentor junior team members, and lead across design, implementation, and delivery. … or GCP). A background or interest in scientific, environmental, or infrastructure-related domains is a bonus. This is an excellent opportunity to join a collaborative and tech-focused software team in a senior position offering a mix of engineering depth, meaningful projects, and long-term growth. The Role: *Full-stack development using .NET and React *Azure DevOps More ❯

An excellent opportunity awaits an experienced software developer with strong .NET and React skills to join a leading software company in a role offering strong technical variety, ongoing development opportunities, and involvement in genuinely interesting projects. This company builds innovative software and data management systems that support critical decision-making in sectors such as environmental monitoring, infrastructure … and energy. In this role you'll join as a senior member of the development team, taking a hands-on role in the full lifecycle of a specialist management platform. You’ll help shape the product’s technical direction, mentor junior team members, and lead across design, implementation, and delivery. This is a UK based remote role. The ideal … or GCP). A background or interest in scientific, environmental, or infrastructure-related domains is a bonus. This is an excellent opportunity to join a collaborative and tech-focused software team in a senior position offering a mix of engineering depth, meaningful projects, and long-term growth. The Role: *Full-stack development using .NET and React *Azure DevOps More ❯

Are you a Software Engineer with C# experience looking for your next challenge? Here at Leonardo, we are on the hunt for talented software engineers to support our Integrated Sensors & Protection line of business, working on a range of defence projects. Direct industry experience is not required; we are happy to explore all backgrounds and help develop … our software engineers. What you will do: We want to develop a new generation of features and capabilities using innovative software solutions. You will be a key part of a community of world-class software engineers who will continuously improve, collaborate, and innovate to create market-leading products within the defence industry. What we are looking for … Useful to have Experience with military domains, e.g., automation (sentry mode) Knowledge of industrial protocols (e.g., Synergia) Experience with radar systems Experience with Luciad Experience with CUAS/Tracking software, including data fusion, thermal/IR imaging, AI/ML exploitation What you will get: Flexible working hours and part-time options to support work-life balance Flexible benefits More ❯

Social network you want to login/join with: Senior Software Engineer - Remote - Fintech - Up to £120k - Python TypeScript AWS, Colchester Client: Opus Recruitment Solutions Location: Colchester, United Kingdom Job Category: Other EU work permit required: Yes Job Views: 4 Posted: 31.05.2025 Expiry Date: 15.07.2025 Job Description: I am exclusively supporting a FinTech Product Company that is … currently hiring for 2 Senior Software Engineers to join their remote engineering team. The company is profitable, with a product used by multiple enterprise clients. They seek a confident, experienced, and passionate Senior Software Engineer with a product mindset and deep understanding of Software Engineering. The role is full-stack, with a focus on … stack includes: Python React/TypeScript Node.js AWS GenAI Experience with another backend language (Ruby, C++, Elixir, Haskell, Go, Clojure, or Scala) is a plus. Interest or passion for software engineering and private projects are also advantageous. The company is heavily involved in AI and uses up-to-date AI technologies. The role offers up to £120k and is More ❯

Social network you want to login/join with: Senior Software Engineer - Remote - Fintech - Up to £120k - Python, TypeScript, AWS, Basildon Client: Opus Recruitment Solutions Location: Basildon, United Kingdom Job Category: Other EU work permit required: Yes Job Views: 9 Posted: 06.06.2025 Expiry Date: 21.07.2025 Job Description: I am exclusively supporting a FinTech Product Company that is … currently hiring for 2 Senior Software Engineers to join their remote engineering team. The company is profitable, with an existing product used by multiple enterprise clients. They are looking for a confident, experienced, and passionate Senior Software Engineer with a product mindset and a deep understanding of Software Engineering. Their approach emphasizes quality engineering More ❯

Social network you want to login/join with: Senior Software Engineer - Remote - Fintech - Up to £120k - Python TypeScript AWS, chelmsford col-narrow-left Client: Opus Recruitment Solutions Location: Job Category: Other - EU work permit required: Yes col-narrow-right Job Views: 4 Posted: 31.05.2025 Expiry Date: 15.07.2025 col-wide Job Description: I am exclusively supporting a … FinTech Product Company who are currently hiring for 2 x Senior Software Engineers to join their remote engineering team. They are profitable and already have their product (which i can expand on) used by a number of enterprise clients. They are looking for a confident, experienced & passionate Senior Software Engineer with a product mindset and … a deep understanding of Software Engineering. As a business, they are heavily driven by quality engineering & innovation and try to do things in a product mindset based around their end users. The role is FULL-STACK but definitely leaning towards the backend. Their stack: Python React/TypeScript Node.js AWS GenAI + experience with another backend language (Ruby, C++. More ❯

to learn more. Base pay range Direct message the job poster from Holt Executive Ltd Technical Headhunter | Sourcing Elite Talent for Aerospace, Satellite & Defence Tech Are you an experienced Software Engineer with a passion for innovation and real-world impact? Join a growing engineering team working on world-class ground surveillance technologies used in over 35 countries. This … is an opportunity to help shape the software behind advanced radar systems that protect borders, monitor perimeters, and secure critical infrastructure. You’ll work across a full software stack, from embedded radar processing to user-facing control systems, helping integrate cutting-edge technology with third-party surveillance platforms and enhancing the user experience. If you're creative, collaborative … and excited about pushing the limits of software engineering, we want to hear from you. What You’ll Be Doing Design and develop software for radar systems and external interfaces Improve system integration with third-party surveillance and security platforms Enhance UI/UX for end-users and develop intuitive control systems Contribute to continuous improvement of software More ❯

Are you an experienced Software Engineer with a passion for innovation and real-world impact? Join a growing engineering team working on world-class ground surveillance technologies used in over 35 countries. This is an opportunity to help shape the software behind advanced radar systems that protect borders, monitor perimeters, and secure critical infrastructure. You’ll work … across a full software stack, from embedded radar processing to user-facing control systems, helping integrate cutting-edge technology with third-party surveillance platforms and enhancing the user experience. If you're creative, collaborative, and excited about pushing the limits of software engineering, we want to hear from you. What You’ll Be Doing Design and develop software … external interfaces Improve system integration with third-party surveillance and security platforms Enhance UI/UX for end-users and develop intuitive control systems Contribute to continuous improvement of software engineering practices What We’re Looking For 5+ years of software development experience Solid background in object-oriented software design Strong problem-solving and communication skills A More ❯

Are you an experienced Software Engineer with a passion for innovation and real-world impact? Join a growing engineering team working on world-class ground surveillance technologies used in over 35 countries. This is an opportunity to help shape the software behind advanced radar systems that protect borders, monitor perimeters, and secure critical infrastructure. You’ll work … across a full software stack, from embedded radar processing to user-facing control systems, helping integrate cutting-edge technology with third-party surveillance platforms and enhancing the user experience. If you're creative, collaborative, and excited about pushing the limits of software engineering, we want to hear from you. What You’ll Be Doing Design and develop software … external interfaces Improve system integration with third-party surveillance and security platforms Enhance UI/UX for end-users and develop intuitive control systems Contribute to continuous improvement of software engineering practices What We’re Looking For 5+ years of software development experience Solid background in object-oriented software design Strong problem-solving and communication skills A More ❯

Senior Embedded Software Engineer – Essex - £55,000 - £65,000 pa A global electronics manufacturer designing leading products used in the Space, Aerospace & Defence sector are looking for a Senior Embedded Software Engineer to join their R&D team. Responsibilities: Work in a cross-functional team designing and developing leading products for the semiconductor, aerospace … defence & space sectors. Lead the design & development of embedded Linux software. Develop and optimise software components to meet industry standards. Write & de-bug efficient C++ code, focusing on Linux Kernel and driver development. Use tools like Git for version control. Key Skills/Experience: Degree in Electronics/Computer Science or another relevant discipline. Embedded C/C++. Embedded … Linux. Kernel/Device Drivers development. Microcontroller & Peripherals (STM32, Cortex-M etc.). Networking protocols/serial interfaces (CAN, USB, I2C, TCP/IP, SPI etc.). Software de-bugging & version control tools (JIRA, Git, Jenkins etc.). Must be eligible to obtain at least basic level security clearance. If you are interested in the position and think you More ❯

Job Title: Senior Software Engineer - C++ Location: Colchester Salary: Up to £65,000 per annum Are you an experienced Senior Software Engineer - C++, looking to push the boundaries of technology. This role, based in the historic town of Colchester, offers an exceptional platform to elevate your career while working on cutting-edge technology. Imagine … a position where your expertise in software, C++, Python, GUI and Linux is not just valued but celebrated. This is a chance to work with a dynamic team of engineers and working on projects from conception to completion. You will be instrumental in shaping the future of embedded systems, making a tangible impact in a forward-thinking company. The … This role is designed for someone who thrives on challenge and is eager to push the boundaries of what is possible in the realm of software. Key Responsibilities for Senior Software Engineer - C++: - Design, develop and test reliable and robust software - working on greenfield development and enhancement of existing systems - Collaborate with cross-functional teams including More ❯

Job Title: Senior Software Engineer - C++ Location: Colchester Salary: Up to £65,000 per annum Are you an experienced Senior Software Engineer - C++, looking to push the boundaries of technology. This role, based in the historic town of Colchester, offers an exceptional platform to elevate your career while working on cutting-edge technology. Imagine … a position where your expertise in software, C++, Python, GUI and Linux is not just valued but celebrated. This is a chance to work with a dynamic team of engineers and working on projects from conception to completion. You will be instrumental in shaping the future of embedded systems, making a tangible impact in a forward-thinking company. The … This role is designed for someone who thrives on challenge and is eager to push the boundaries of what is possible in the realm of software. Key Responsibilities for Senior Software Engineer - C++: - Design, develop and test reliable and robust software - working on greenfield development and enhancement of existing systems - Collaborate with cross-functional teams including More ❯

Job Title: Senior Software Engineer - C++ Location: Colchester Salary: Up to £65,000 per annum Are you an experienced Senior Software Engineer - C++, looking to push the boundaries of technology. This role, based in the historic town of Colchester, offers an exceptional platform to elevate your career while working on cutting-edge technology. Imagine … a position where your expertise in software, C++, Python, GUI and Linux is not just valued but celebrated. This is a chance to work with a dynamic team of engineers and working on projects from conception to completion. You will be instrumental in shaping the future of embedded systems, making a tangible impact in a forward-thinking company. The … This role is designed for someone who thrives on challenge and is eager to push the boundaries of what is possible in the realm of software. Key Responsibilities for Senior Software Engineer - C++: - Design, develop and test reliable and robust software - working on greenfield development and enhancement of existing systems - Collaborate with cross-functional teams including More ❯