Senior Backend Engineer in London

When you join Exclaimer you will join a global award-winning SaaS provider with an exceptional revenue rate, ambitious growth plans, and an inclusive and outcomes-driven culture. Exclaimer is a high-growth SaaS company with 300+ colleagues across the UK, US, Europe, and Asia-Pacific. We promote a people-first culture built on fairness, inclusion, psychological safety, and continuous learning. As we evolve into a multi-channel platform for branded business communications, we offer employees the opportunity to shape the future of global communication—while growing their careers in a culture where curiosity, creativity, and accountability thrive.

We're officially Great Place To Work CertifiedTM. Exclaimer has been recognised by Great Place To Work for our culture of collaboration, trust, and growth. This certification reflects our commitment to creating an environment where every voice matters and people genuinely enjoy coming to work.

About The Opportunity

Key responsibilities

• Be an individual contributor, implementing high quality, well-tested and peer‐reviewed solutions, setting an example to the team around you.
• Implement clean and consistent peer‐reviewed technical designs.
• Lead and mentor software engineers, including providing technical guidance and code reviews, and fostering a culture of collaboration and continuous improvement.
• Work as part of a small focused agile development team owning the full software life cycle, from design through implementation, test to deployment, and monitoring in production.
• Design and develop software for the end‐to‐end testing lifecycle including tools, frameworks and automated tests.
• Apply specialist technical knowledge to create or modify solutions that can serve millions of requests every day.
• Create clean, efficient and testable code, in line with company coding standards, and actively seek to improve performance, code quality and architecture.
• Continuously drive improvement within yourself and the team by putting forward improvements to the technology stack and processes.
• Support the propagation of knowledge and skills through the development team and help drive improvements to technical best practices.
• Help define the technical approach and lead day‐to‐day initiatives in the development team, working with other engineers, engineering managers and staff engineers to ensure the technical approach aligns with technical strategy and industry best practices.

Skills, knowledge, and expertise

• Be a hands‐on back‐end engineer utilizing the latest version of .NET and C#, with a strong knowledge of development and technical principles, methodologies, and values.
• Be an experienced and driven individual contributor with the knowledge and skills to guide technical direction, unblock the development team, and act as a point of technical escalation and knowledge within the team.
• Experience with key technologies utilized by Exclaimer: C#, .NET, Docker, Microservice Architecture, unit and automation testing, Azure (Storage, AKS, SQL, Service Bus and more), and monitoring (Datadog).
• Deep diagnostics and debugging skills to identify root causes of issues and provide robust solutions.
• Experience working in a senior or leadership role in a fast‐paced SaaS business to achieve high‐frequency incremental delivery of customer‐facing functionality.
• Experience with SMTP, MIME, email processing, and high‐performance C# applications is desirable.
• Experience creating and maintaining high‐throughput backend services for the core operations of a 24/7 SaaS product.
• Ability to work closely with product management and engineering managers to identify solutions to customer/technical problems and break work into small incremental deliveries.
• Establish trust and build relationships with engineers, peers, and stakeholders across the business; communicate clearly and succinctly without ambiguity.

At Exclaimer, we're proud to offer a benefits package that reflects our commitment to supporting you professionally, personally, and wherever life takes you. Alongside competitive pay, you'll have access to generous paid time off, flexible working options including our XFlex programme and a "work from anywhere" allowance – plus enhanced leave for all new parents, regardless of gender, family structure, or path to parenthood. Our wellbeing offering includes comprehensive healthcare coverage, fully funded insurance and income protection, access to 24/7 virtual care, and mental health, legal and financial support through employee assistance programmes. We help you plan for the future with contributory retirement plans and savings support, and back your day‐to‐day wellbeing with perks such as subscriptions to Calm and Blinkist, fitness and lifestyle credits, global travel assistance, and a wide range of discounts.

At Exclaimer, inclusion is more than a policy – it's part of who we are. We're proud to be an equal‐opportunity employer and welcome applications from people of all backgrounds, experiences, and identities. We consider all candidates fairly and without discrimination irrespective of ethnicity, race, religion, nationality, age, gender, marital status, disability, neurodivergence, caring responsibilities, sexual orientation, or gender identity. We're building a culture where everyone feels they belong and can thrive, and we'd love for you to be part of it. If you require any reasonable adjustments or support through the application or hiring process, please email the team in confidence via Work@Exclaimer.com to let us know.