1 to 25 of 78 Permanent Senior Software Engineer Jobs in Slough

Working for an industry leading, high-growth SaaS business with some of the biggest brand names in the world as customers, the Senior Software Engineer will build innovative next-gen solutions that are at the forefront of the industry. In this role, the Senior Software Engineer will be given full autonomy, taking ownership from … backend systems (some frontend too, if you like). This area is the future of the company (and the industry!) and as such has strong investment and visibility. The Senior Software Engineer will be responsible for leading the design, build and deployment of industry leading software solutions. You’ll work in collaboration with product, design and … the wider engineering team to improve and scale existing features, as well as build brand new ones. The Senior Software Engineer will have: • Strong backend or full-stack software development experience • Strong coding experience in either Java, Golang (Go), Python or Scala – multiple would be even better! • Experience with cloud platforms e.g. AWS, Azure, GCP - Google More ❯

Senior Software Engineer/Developer (C# .Net) *Newcastle onsite* to £130k+ Are you a Senior Software Engineer looking to escape the hustle and bustle of London and relocate to somewhere with stunning scenery and a better quality of life (there's also great restaurants and bars!)? You could be joining a rapidly scaling FinTech … company has secure backing and an established Hedge Fund client as a partner, they're creating a finance technology hub bringing a wealth of talent and experience. As a Senior Software Engineer you will collaborate with a small, talented team to deliver the core trading platform within a Microsoft environment using the latest versions of C# .Net … problem solving, working on complex, distributed systems You have expertise with modern C# .Net Core, Python skills would also be of benefit You have a strong knowledge of modern software engineering best practices and have experience across the full software development lifecycle You have a thorough understanding of Computer Science fundamentals such as OOP, Data Structures, Design Patterns More ❯

Senior Software Engineer/Developer (Full Stack JavaScript) London to £100k Opportunity to progress your career in a senior, hands-on Software Engineer role at a scale-up tech company, that enables smart matching for commercial van drivers and consumers, via job bidding and route optimisation, streamlining processes and delivering CO2 carbon neutral targets … established 10 years, with recent funding of £125 million. You'll be working on complex and interesting systems and can enjoy a range of benefits and perks. As a Senior Software Engineer you'll collaborate as part of an Agile technology team to design and develop, troubleshoot and solve complex software issues to help scale and … understanding of web development practices, tools and technologies You enjoy learning and picking up new things You're flexible and able to adapt to changing priorities You have full software development lifecycle experience including CI/CD and testing You're collaborative with Agile team experience, happy to mentor more junior developers You're likely to be degree educated More ❯

Senior Software Engineer/Developer (Python FastAPI Data) London to £90k Are you a data centric Software Engineer with strong Python and SQL skills? You could be progressing your career in a senior, hands-on role at a fast growing, global Insurance Underwriting technology provider that focusses on developing a complex SaaS calculation platform … for rapidly growing Cybersecurity insurance markets. As a Senior Software Engineer you will design and develop data centric backend services for the core platform with a focus on Python coding and building FastAPIs within an Azure environment with Databricks. You'll participate in the design and implementation of advanced mechanisms for data ingestion, transformation, mass parallel orchestration … s a hybrid work from home model with three days a week in the high spec London, City office with rooftop bar. About you: You have strong Python backend software engineering skills You have experience of building FastAPIs You have a good knowledge of public cloud services, they're using Azure but experience with AWS or GCP is fine More ❯

Senior Software Engineer (TypeScript Full Stack) London/WFH to £100k Do you enjoy problem solving and working with a range of technologies including functional programming languages such as Elixir, using the right tool for the job? You could be progressing your career in a senior, hands-on Software Engineer role at a successful … office per week) Vitality Healthcare Continuous career development and learning opportunities Influential role as part of a small, close knit team Complex and interesting work Your role: As a Senior Software Engineer you will take ownership, working on technically challenging Greenfield development projects. You'll be working on complex problems with scalability and reliability in mind, across … educated in Computer Science or similar STEM discipline, having achieved a 2.1 or above from a Russel Group/Oxbridge or top 100 global university You are an experienced software engineer with a strong knowledge of best practices and Computer Science fundamentals and experience of delivering complex, data centric software You have advanced analytical and problem solving More ❯

Senior Software Engineer | Legacy to Modern | C#, .Net | SaaS Data A fast-growing SaaS business is investing heavily in its tech platform and building out a senior engineering hub in London. They’re on the lookout for a Senior Software Engineer to help drive modernisation, set technical direction, and mentor squads as they … scale. This is a senior, hands-on role. You’ll design and build applications, lead migrations away from legacy frameworks, and ensure the platform is stable, scalable, and fit for the future. Expect to spend plenty of time coding, alongside leading migrations and leading/mentoring 4 engineers. You will have complete autonomy for all things C# .NET in … Comfortable balancing legacy upkeep with platform modernisation Confident with IIS, AWS, TeamCity, Octopus Deploy, SQL Server Bonus points for exposure to Angular or Telerik libraries Prior experience as a senior engineer in SaaS or product-led teams Someone who enjoys mentoring, influencing direction, and staying hands-on Location & working style: Hybrid London role, with 1–2 days a More ❯

Senior Software Engineer/Developer (Java AWS) London/WFH to £100k Opportunity to progress your career in a senior, hands-on Software Engineer role at a global FinTech/CFD trading company that has been consistently voted as one of the UKs top employers. As a Senior Software Engineer you … You'll be working with a modern tech stack using Java, Spring Boot, CI/CD, Kubernetes, AWS, EKS and Grafana/Splunk. About you: You have advanced backend software engineering experience with Java, Spring Boot, REST, Postgres, Redis You have experience of running production workloads on Kubernetes (Amazon EKS preferred) You have a good knowledge of DevOps practices … annual budget for organising events and projects that foster an open, diverse and inclusive culture Plus a range of other perks Apply now to find out more about this Senior Software Engineer/Developer (Java AWS Spring Boot) opportunity. At Client Server we believe in a diverse workplace that allows people to play to their strengths and More ❯

Role : Java Software Engineer 💰 Salary: Up to £95,000 +10% Bonus 🌍 Location: London (2 days a week) 🛠 Key Skills: Java 17+, SpringBoot, React/Typescript, AWS This is a great opportunity for a Senior Java Software Engineer to a travel experiences business. You’ll lead backend services and API integrations with a huge number of … ll join a cross-functional team, being the go-to for these services and will contribute to architectural design and technology decision making across the product.. 🎯 Responsibilities as the Senior Java Software Engineer: Assume technical ownership of feature development end-to-end Advocate for best coding practices within the team Lead architecture decision making and technology decision … making Design, build, review, test, and deploy services and code in live production environments Uphold development standards and prioritize best coding practices ✅ Experience needed as the Senior Java Software Engineer: Backend development experience, working with production level Java based applications Strong system architecture and system design skills Familiarity with cloud services (preferably AWS) A passion for ensuring More ❯

Senior AI Software Engineer - London (3 days a week) - up to £150K plus equity London based - 3 days a week Visa sponsorship is available Salary up to £150K with equity on top A venture-backed Fintech company is looking to hire a Senior AI Software Engineer to join their London based team. This is … Computer Science graduates with at least 1 year working in a core AI engineering role within an AI-first company and 3 years experience or more working as a Software Engineer, Backend Engineer, ML Engineer or Product Engineer. Senior AI Software Engineer - London (3 days a week) - up to £150K plus equity More ❯

Senior Software Engineer | High-growth, Purpose-Led and A* funded Fintech | Hybrid – London **Python, TypeScript, React** A leading fintech scale-up is hiring a Senior Software Engineer to join its high-performing engineering organisation in London. This is an opportunity to contribute to a platform designed to improve finance globally — with real impact at … mobile-first platform. Backed by leading venture capital and impact investors, the organisation is entering a new phase of growth, with engineering at the core. The Opportunity As a Senior Engineer, you will play a key role in designing and delivering scalable, reliable systems that handle significant volumes of real-time data and transactions. You'll collaborate with … product, data, and platform teams to deliver high-impact features that directly improve user financial wellbeing. This is a hands-on role for an engineer who values clean architecture, measurable outcomes, and meaningful user impact. What You’ll Do: Design and implement distributed systems that are resilient, scalable, and secure. Own technical decision-making across architecture and implementation — selecting More ❯

Senior Software Engineers – TypeScript/Node.js/SQL/Kafka/GraphQL 📍 Central London | 💼 Equities Trading Business | No finance experience required. Miller Maxwell is assisting a leading equities trading business in expanding their core software engineering team. Based in their central London headquarters, the successful Senior Software Engineers will play a key role in the … design and development of their high-performance trading platform, which supports the execution and analysis of equity trades. 🔧 Key Responsibilities for the Senior Software Engineer: Architect, design, and implement scalable backend services using TypeScript and Node.js . Develop and optimize SQL queries and database schemas for high-volume data processing. Integrate and manage Kafka for real-time … and external applications. Collaborate with cross-functional teams including frontend developers, product managers, and QA engineers. Contribute to code reviews, technical discussions, and continuous improvement initiatives. 📌 Requirements for the Senior Software Engineer: 🎓 Degree in Computer Science, Engineering, or a related STEM field. 🧠 Minimum 5 years of commercial experience in backend development. 💻 Strong proficiency in TypeScript and Node.js More ❯

Senior Software Engineer | Hybrid | Node | AWS | TypeScript | £100k + 10% bonus La Fosse has partnered with a global leader in customer loyalty and travel services. We're looking for a Senior Software Engineer with a strong background in full-stack JavaScript (Backend JS leaning) to join their growing team. Your mission: Build greenfield systems … industry-leading engineering practices. What They're Looking For 6+ years of technical experience with the Full Stack JavaScript ecosystem Experience leading the design, development, and operation of innovative software solutions Strong skills in modern web development (Node.js, AWS, TypeScript) and a solid understanding of web architecture Proficiency in building and managing APIs (GraphQL & RESTful) and strong database fundamentals … twice weekly) Interview Process: Streamlined two-stage virtual interview If this sounds like the next step in your engineering journey, we'd love to hear from you. Apply now! Senior Software Engineer | Hybrid | Node | AWS | TypeScript | £100k + 10% bonus More ❯

Senior Software Engineer Key Technologies: C#, .NET, React, AWS, Docker, Kubernetes City of London, United Kingdom Perm Role: £80,000 - £120,000 Harrington Starr has partnered with a Global Financial Services Vendor and they are looking for a Senior C#, .NET Software Engineer to join their growing team! This role provides the perfect opportunity … communication skills. Unrestricted right to work in the UK. This role offers hybrid working, with an office location based in the City of London. This role will suit a Senior Software Engineer, with expert C#, .NET experience and commercial use of React having a direct impact from the get-go. Apply below and if you have any More ❯

At a Glance Capsa is an AI platform that accelerates due diligence and deepens insights for Private Equity funds. We are hiring senior software engineers who are comfortable contributing across all layers of the application and developing features end to end. Details: Role : Senior Software Engineer - Full Stack Location : London, UK (Hybrid, In-Person … defense companies like QinetiQ and retail tech startups such as Standard AI. The entire team consists of early-stage startup veterans passionate about building exceptional products. The Role A senior software engineer at Capsa is expected to own projects and features from conception to production, working across the stack to deliver improvements to our AI platform. Key … vision and will have a direct impact on its success. Have the opportunity for fast career growth. Enjoy yourself! Apply if: You have 4+ years of experience as a software engineer in a venture backed startup or top tech firm. You have taken entire products or features from ideation to production and you've measured their impact. You More ❯

Senior Software Engineer – Middle Office Trading & Technology London | Hybrid (3 days onsite, 2 remote) A scaling macro hedge fund founded by a leading portfolio manager from a top multi-manager is seeking a Senior Software Engineer to join its Middle Office Trading & Technology team. The fund continues to expand across London and New York … trading fixed-income relative value and macro strategies. As a Senior Engineer, you will design and build core systems supporting trade capture, lifecycle management, P&L, and reconciliations , working directly with trading, quant, and operations teams. Requirements: 5+ years’ experience in trading or financial-technology environments Strong proficiency in C# and Python Experience with middle-office, risk, or … trade lifecycle systems Pragmatic, collaborative engineer with a focus on reliability and scalability Highlights: High-impact engineering role within a top-performing macro fund Hybrid model: 3 days onsite/2 remote More ❯

Senior Software Engineer (Python) Hybrid London (1–3 days per week) Up to £80,000 + Benefits Are you a passionate Python engineer who thrives on building scalable, high-quality software? We’re working with a multi-award-winning digital agency , recognised as one of the Sunday Times Best Places to Work, that’s looking … for a Senior Software Engineer (Python) to help shape the next generation of their data-driven tools and products. 💡 Why this role? Work at the intersection of data, automation, and AI , delivering tools that drive measurable impact for global brands. Join a collaborative, innovative engineering culture where learning, experimentation, and technical excellence are at the core. Hybrid … technical bar across the team. Staying hands-on while contributing to the architectural direction and long-term roadmap. 🎯 What we’re looking for: 5+ years of experience as a Software Engineer, ideally in Python (3.10+). Proven experience developing cloud-native applications (GCP or AWS). Strong understanding of CI/CD pipelines (e.g. GitHub Actions) and containerisation More ❯

Senior Golang Software Engineer - AI Scale-up - Voice AI (Permanent - flexible salary) Senior Golang Software Engineer is now required by an Innovative AI scale up to build the strategic architecture platform for their AI product offering This role will be responsible for building a stable and replicable architecture for their core application, focusing on … application journey. Implement secure on-device storage for sensitive data. Collaborate with back-end engineers to successfully integrate RESTful APIs for data collection and AI services. Key Requirements: Strong Senior Software Engineer experience Exceptional Go/Golang skills Experience working across low-latency and zero trust platforms Experience across more than 1 cloud platform (AWS, Azure and More ❯

About the Job Senior Software Engineer- Hybrid (2 days on site)- London- £100K+ Incredible Benefits Are you passionate about working with cutting-edge technology and looking to grow your skills in a forward-thinking environment? We’re currently looking for Senior Software Engineers who enjoy being hands-on and thrive on solving complex technical challenges. … the personal insurance space. The venture combines the agility and innovation of a start-up with the stability and backing of a major UK financial services provider. As a Senior Software Engineer , you’ll collaborate closely with Product Owners, subject matter experts, and other team members to deliver high-quality outcomes through continuous development and release cycles. More ❯

Software Engineer (Java Microservices) – Package up to £130k + Excellent Benefits An exciting opportunity has arisen for a Senior Software Engineer (Java Microservices) to join one of the UK’s leading financial institutions, driving innovative digital solutions that power millions of customer interactions every day. You’ll be joining a talented, forward-thinking team delivering … high-performance services within a major transformation programme. This is a fantastic opportunity for a technically minded individual with strong server-side experience to design, build, and deploy resilient software solutions that make a real impact. Responsibilities Design, develop, test, and deliver high-quality, maintainable code across the entire software development lifecycle. Collaborate within a specialist engineering team … working closely with architects and senior engineers to build robust, scalable microservices. Apply Agile methodologies to drive continuous improvement, innovation, and rapid delivery of business value. Contribute to the evolution of software architecture and design, using experimentation and prototyping to shape modern solutions. Champion automation across build, testing, and deployment processes to enhance quality, reliability, and development efficiency. More ❯

Senior Embedded Software Engineer Salary : Up to £100,000 Location : London - 3 days a week We’re working with a rapidly growing tech for good company that is transforming how data, automation, and smart integrations shape the future of digital infrastructure. Their platform optimises real-time operations, connecting users with seamless, intelligent technology solutions. We are looking … for a modern, innovative and driven Senior Embedded Software Engineer to join their growing team. They are looking for someone who has commercial experience working with C software development in an IoT, hardware or embedded solutions environment , who is interested in a data-driven AI-first journey. Responsibilities: Design, implement, and test firmware for embedded systems … issues. Develop and manage automated test frameworks for embedded devices to ensure robust validation. Create and execute both manual and automated test cases. Key requirements: 5+ years experience in software development with C in an embedded environment. Proven knowledge in digital electronics and working at the interface between hardware and firmware. Strong experience debugging embedded software and associated More ❯

Senior Software Engineer 📍 Location: Onsite, London, United Kingdom ⌛ Type: Full-time 💰 Compensation: Negotiable (Competitive salary + equity) About Ontik Ontik is an ambitious, early-stage B2B financial operations platform designed to streamline and simplify complex financial workflows for heavy duty industries. We’re scaling rapidly and looking for top-tier engineers to join our team. You’ll … chance to work in a high-performance, ownership-driven environment, where you can make a direct impact on the product and help shape its future. Role overview As a Software Engineer (Full-Stack) at Ontik, you’ll play a pivotal role in building and scaling our financial operations platform. This is a hands-on, high-impact position where … simplify financial workflows for our users. You’ll have the opportunity to own critical features and contribute to the overall architecture of our platform. We’re looking for an engineer who thrives in a fast-paced environment, embraces ownership, and is passionate about building software that makes a real difference. If you enjoy working with cutting-edge technologies More ❯

Senior Software Engineer Opportunity - Tech for Good - Up to100k Base + Equity We're looking for a Full Stack Senior Software Engineer to join a mission-driven deep tech spin out from Imperial - think autonomous vehicle-level complexity, but applied to a completely new domain. You will be solving deep technical challenges with real … world impact. The ideal candidate should have some iOS experience—either as an iOS developer or through exposure while working as a software engineer. Role Highlights: 💰 Up to £100k base plus very generous equity 🌍 London/Hybrid 🚀 Backed by serious funding, with 100x growth targets already in motion 🧠 Work alongside top scientists, designers, and engineers in a flat, fast … moving team Looking for: -Software Engineering experience with strong fundamentals and a drive to learn. -STEM degree -Someone who thrives in high-intensity, high-impact environments. -Willingness to learn new technologies -Previous iOS/Swift experience Apply here ot email your CV to jordan@wearemoe.com More ❯

Senior Software Engineer (C++) – Real-Time Market Data Systems Company Insight: A leading global quant trading firm is looking for a senior software engineer experienced in market data processing to help evolve the firm's real-time market data platform - a critical system that supports both trading and research operations across the firm. The … and deliver long-term results. Responsibilities: Build and enhance real-time market data and distribution pipelines spanning global markets and multiple asset classes. Design and optimise high-performance, distributed software systems for processing market data at scale. Champion engineering best practices and innovation. Serve as a technical leader in market data systems. Apply data-driven performance analysis to streamline More ❯

Senior Software Engineer (Java) – Portfolio Optimization | Fintech | London/Hybrid About My Client My client is a high-growth fintech company transforming the way capital markets operate. Their mission is to make global financial systems safer , more efficient , and more open , using advanced technology and deep domain expertise. They partner with leading banks and institutional investors to … develop intelligent solutions that optimise portfolios, reduce risk, and unlock access to more diversified capital. About the Role My client is seeking a Senior Software Engineer to join their Portfolio Optimization team — a core group responsible for building the technology that drives their balance-sheet and exposure-management platform. This is a hands-on development role in … that support large-scale data processing, analytics, and optimization algorithms. Key Responsibilities Take active part in a team of developers working on my client's Portfolio Optimisation products Design software according to agreed standards, architecture, and requirements Plan and build high quality, scalable, and secure solutions Work closely with team lead, team members and product managers in defining and More ❯

Senior Software Engineer | Capital Markets | Scale-Up About the Company They're a fast-growing London-based technology company transforming how institutional players access and use market data in the global energy and commodities space. In an industry still reliant on manual workflows and legacy systems, they're building next-generation analytics and trading intelligence tools that … strong backing from top-tier investors, they’re scaling rapidly to tackle new, complex challenges that have never been solved before. About the Role They’re looking for a Senior Software Engineer who’s eager to take ownership of high-impact projects from idea to execution. You’ll collaborate closely with product and engineering to design and … best practices for code quality, performance, and reliability Mentor junior team members and contribute to a strong, collaborative engineering culture What You’ll Bring 5+ years of hands-on software engineering experience Strong communication skills and a collaborative mindset Proven ability to take initiative and manage complex projects independently A tech-agnostic approach with proficiency in at least one More ❯