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Senior Software Engineer

United Kingdom, London · Job Posted June 01, 2026
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Job Description

At Optimizely, we're on a mission to help people unlock their digital potential. We do that by reinventing how marketing and product teams work to create and optimize digital experiences across all channels. With Optimizely One, our industry-first operating system for marketers, we offer teams flexibility and choice to build their stack their way with our fully SaaS, fully decoupled, and highly composable solution. We are proud to help more than 10,000 businesses, including H&M, PayPal, Zoom, and Toyota, enrich their customer lifetime value, increase revenue and grow their brands. Our innovation and excellence have earned us numerous recognitions as a leader by industry analysts such as Gartner, Forrester, and IDC, reinforcing our role as a trailblazer in MarTech. At our core, we believe work is about more than just numbers -- it's about the people. Our culture is dynamic and constantly evolving, shaped by every employee, their actions and their stories. With over 1500 Optimizers spread across 12 global locations, our diverse team embodies the 'One Optimizely' spirit, emphasizing collaboration and continuous improvement, while fostering a culture where every voice is heard and valued. Join us and become part of a company that's empowering people to unlock their digital potential! To get a sneak peek into our culture, find us on Instagram: @optimizely

Job Responsibility

  • Design, implement, and document software solutions that are simple, secure, scalable, and maintainable
  • Own the operational excellence of your domain, including instrumentation, monitoring and alerting
  • Ensure product quality through thorough automated testing
  • Drive delivery of complex features end-to-end, working across team boundaries when needed
  • Contribute to architecture and design discussions within your team and across teams
  • Participate in project planning, requirements gathering, design, and task refinement
  • Handle incidents and assist our support organisation when they need engineering expertise
  • Bring customer perspective into technical decisions
  • Mentor other engineers and share knowledge across the team
  • Participate in hiring and help grow a diverse engineering organisation

Requirements

  • Typically 8+ years of professional experience with modern software development practices
  • Strong software design and engineering fundamentals, including object-oriented analysis and design
  • Solid experience with C# and .NET, and with React on the frontend
  • Hands-on experience with CMS platforms, content modelling, or digital experience tooling
  • Experience building and operating cloud-based software
  • Already using AI tools, coding assistants, and potentially agents as part of your daily workflow
  • Comfortable working in an agile environment alongside designers, product managers, and other stakeholders
  • Good communicator who enjoys solving problems together with others

Nice to have

  • Experience with Optimizely CMS or other CMS/DXP platforms
  • .NET Core MVC
  • SQL (particularly MS SQL)
  • Containers and container orchestration
  • Microsoft Azure
  • HTTP APIs, REST services, or GraphQL
  • Experience building large, modular applications with continuous delivery
  • A degree in Computer Science or equivalent

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