Senior Software Engineering - Telecommute

Senior Software Engineer

Remote, UK

NMI is building a mature, product-oriented Reliability Engineering function, and we're looking for a Senior Software Engineer to play a key role in that evolution.

This role sits on the Reliability Engineering team, which focuses on improving the reliability, performance, and operational maturity of critical platform services. As a Senior Engineer, you will operate beyond a single service or codebase, designing and building reliability frameworks, platform capabilities, and guardrails that improve uptime, observability, and operational confidence. Design and build reliability-focused frameworks, tooling, and standards that improve platform uptime, performance, and operational confidence.

Partner with engineering teams to embed reliability into system design, development practices, and deployment workflows.

Identify systemic risks and failure patterns, and lead efforts to address them through automation, architectural improvements, and process refinement.

Contribute hands-on to production codebases, internal tools, and platform services with a focus on long-term maintainability.

6+ years of experience building and operating production-grade software systems in complex environments.

• Strong experience developing backend services in PHP, with the ability and desire to work language-agnostically and quickly learn new languages, frameworks, and codebases as needed.
• Proven experience working on reliable, scalable, and highly available systems, with a clear understanding of tradeoffs in performance, resilience, and maintainability.
• Practical experience designing or contributing to platform-level reliability solutions, such as observability tooling, alerting strategies, or reliability standards.
• Strong knowledge of relational databases and data access patterns, with an operational mindset toward performance and reliability.
• Hands-on experience deploying and operating services in cloud environments (AWS or equivalent).
• Annual bonus scheme dependent on individual and company performance
• 25 days holiday each year (+ bank holidays + 1 day after each year of service with up to a max. Workplace pension scheme
• Private medical insurance (upon 30 days of employment)
• A remote first culture
• Great work-life balance with our Flexi-time policy
• Family Friendly policies (Enhanced Maternity and Paternity Pay and Shared Parental Leave).
• A chance to develop with an allocated company training budget
• Lifeworks, an Employee Assistance Programme which offers wellbeing, family and financial support services, such as assessments, resources and even 1:1 counselling sessions. Employee referral scheme with generous financial reward
• We're the platform that powers success for innovative tech created by SMBs, entrepreneurs and fintech startups. We're creative problem solvers who help visionaries smash through boundaries and think beyond what's possible so they can think about what's next. But we're not just built for the tech savvy. We democratize the latest payments technology so that everyone can realize the benefits of easy payments across the full spectrum of commerce. We're focused on making NMI more diverse and welcoming with initiatives like having a dedicated Diversity, Equity & Inclusion action group, diversity goals for hiring, anonymized resume screening, affinity groups such as our Women's network and LGBTQ+ Network, open forums for discussions on diversity and social justice, and measuring inclusion and belonging as part of our regular employee engagement surveys. Equal Opportunity NMI is committed to providing equal employment opportunity for all persons regardless of race, color, religion, sex, age, marital status, national origin, sexual orientation or sexual identity, genetic information, citizen status (except those that do not have the legal right to be employed in the United States), disability, military service, service member, veteran status, or any other basis protected by applicable law. Please be aware that all offers of employment are made subject to receipt of satisfactory background and financial checks. Please note that in compliance with the data protection regulations within your jurisdiction, any personal information submitted with your job application may be collected and used by NMI for the purpose of recruitment and employment-related activities. By submitting your application, you acknowledge and provide explicit consent to the processing of your personal information as described in our privacy policy found on our website.