Senior Platform Engineer

Senior Platform Engineer

LemFi

LemFi (Series B) is building the go-to financial app for the Global South. Moving to a new country shouldn’t mean starting from zero. That's why our team of 400+ spanning 20+ countries is building a financial ecosystem that helps immigrants stay connected to home, build stability, and create wealth regardless of where they are from or where they live. What began as fast, affordable remittances is now evolving into a complete platform for multi-currency accounts, payments, credit, and long-term financial growth. With millions of users across the globe, we process over $1B in monthly transactions to 30+ countries, proving that borders shouldn't limit financial opportunity. ABOUT THE ROLE LemFi is the financial engine for people the world wasn't built to serve. We move money, store it, lend it and protect it across ~21 countries - and the platform team is the force multiplier that lets every other engineering team do that at pace. This is the only platform hire we are making this year, which tells you how much we expect from this person. You will design, build and own our internal developer platform: a self-service, AI-powered environment that treats internal engineers as your customers and makes their experience of building on our cloud infrastructure genuinely fast and frictionless. You will touch everything from cloud cost efficiency to developer tooling to the golden paths that let product teams ship without waiting on ops tickets. If you have strong opinions about what great platform engineering looks like and a track record of building things from scratch, not just operating what someone else designed, this is the role. WHAT YOU'LL BUILD AND OWN * Design and build a self-service internal developer platform - golden paths, templates, guardrails - so engineers can provision, deploy and operate services without raising a ticket. * Embed AI-driven automation into the platform: intelligent cost optimisation, anomaly detection, auto-remediation and developer productivity tooling that actually gets used. * Own cloud infrastructure on AWS - architecture, cost efficiency, reliability and security posture - with clear metrics and accountability for outcomes, not just uptime. * Act as the internal product manager for the platform: talk to engineers regularly, collect requirements, prioritise by impact on developer velocity and run a visible roadmap. * Set and enforce platform standards - IaC, CI/CD pipelines, observability, secrets management - turning good practice into the default, not the exception. * Identify and fix the biggest sources of friction in the engineering workflow, using data to prioritise and presenting findings to engineering leadership. * Work lean and autonomously: this is a high-ownership role on a small team, so you will need to push things to production yourself, not coordinate others to do it. YOUR EXPERIENCE * Proven track record building an internal developer platform or developer experience function from scratch - not just maintaining one someone else built. * Deep AWS expertise: you have designed cost-efficient, production-grade cloud architectures and you can defend every line of your Terraform. * Strong DevOps and platform engineering fundamentals: Kubernetes, CI/CD, observability stacks, IaC, and the judgement to know when to use each. * Experience treating internal engineers as customers - gathering requirements, running a backlog, measuring adoption - not just shipping tools and hoping people use them. * Comfortable working without a spec: you have operated in fast-moving environments where you set the direction as much as you follow it. * Proficient in at least one scripting or backend language (Python, Go, or equivalent) and confident building automation and tooling, not just configuring managed services. * You actively build AI-powered tooling into platform and infrastructure workflows - cost anomaly detection, intelligent alerting, automated runbooks - not just use AI in your editor. NICE TO HAVE * Previous fintech or regulated-industry experience where security and compliance constraints shaped your platform decisions. * Hands-on experience with platform engineering frameworks such as Backstage or Port, or building a comparable internal portal. * Exposure to multi-region or multi-currency infrastructure at scale, ideally serving markets in Africa, Europe or the Americas. WHY JOIN LEMFI? Love shouldn’t be expensive, yet those working hardest for their families often face predatory fees and banking exclusion. We're changing this. At LemFi, you won’t be just a cog in a machine. Whether designing products, scaling operations, or telling our story, you’ll tackle complex challenges with real, immediate impact. Your work goes beyond metrics - it puts money back in families’ pockets and offers access to the previously excluded. Join us to make a meaningful difference, where high performance is a lifeline for millions. You can connect with us on LinkedIn and Instagram and if you haven't already, download the app on the App Store or Google Play.

Senior Platform Engineer (Infrastructure)

Fresha

The AI-powered OS for beauty, wellness and self-care About Fresha Fresha is the AI-powered operating system for the global beauty, wellness and self-care industry, connecting and powering everything from salons and barbers to spas, medspas, fitness studios and health practices. Trusted by millions of consumers and businesses worldwide. Fresha is used by 140,000+ businesses and 450,000+ stylists and professionals worldwide, processing over 1 billion appointments to date. The company is headquartered in London, United Kingdom, with 15 global offices located across North America, EMEA and APAC. Fresha allows consumers to discover, book and pay for beauty and wellness appointments with local businesses via its marketplace, while beauty and wellness businesses and professionals use an all-in-one platform to manage their entire operations with an intuitive business software and financial technology solutions.   Fresha’s ecosystem gives merchants everything they need to run their business seamlessly by facilitating appointment bookings, point-of-sale, customer records management, marketing automation, loyalty, beauty products inventory and team management.   The consumer marketplace unlocks revenue potential for partner businesses by leveraging the power of online bookings and automated marketing through mobile apps and advanced integrations with major tech brands including Instagram, Facebook and Google. Role overview   Fresha is entering its next phase of global scale, and the Platform team plays a vital role in making that growth fast, safe, and sustainable.   As a Senior Platform Engineer, you will take end-to-end ownership of how our platform and services are built, deployed, and operated. Your focus is clear: remove friction for engineers, reduce operational risk, and ensure the platform scales alongside the business.   Your mission is to ensure engineers always have the right tools, patterns, and infrastructure so they can deliver faster, safer, and with confidence.   We care deeply about customer impact, even when the work is internal — platform improvements ultimately exist to help Fresha deliver better experiences to customers.   To foster a collaborative environment that thrives on face-to-face interactions and teamwork, all Fresha employees work from our dog-friendly office 4 days per week, with the option to work from home on Wednesday. London office address: The Bower, The Tower,  207 Old St, London EC1V 9NR

Senior Engineer - Platform

Trainline

About us We are champions of rail, inspired to build a greener, more sustainable future of travel. Trainline enables millions of travellers to find and book the best value tickets across carriers, fares, and journey options through our highly rated mobile app, website, and B2B partner channels.  Great journeys start with Trainline 🚄  Now Europe’s number 1 downloaded rail app, with over 135 million monthly visits and £6.3 billion in annual ticket sales, we collaborate with 270+ rail and coach companies in over 40 countries. We want to create a world where travel is as simple, seamless, eco-friendly and affordable as it should be.  Today, we're a FTSE 250 company driven by our incredible team of over 1,000 Trainliners from 50+ nationalities, based across London, Paris, Barcelona, Milan, Edinburgh and Madrid. With our focus on growth in the UK and Europe, now is the perfect time to join us on this high-speed journey.  Introducing the Infrastructure Engineering and Tooling team aka Atlas at Trainline👋 The Infrastructure Engineering and Tooling team, also known as Atlas, owns the ecosystem used to deploy, run and manage traffic across the Trainline platform. The team is currently building the next version of Trainline’s infrastructure platform, with a focus on reliability, quality, automation and secure, scalable delivery. You will join a collaborative team made up of software engineers and platform engineers across a range of experience levels. The team works across technologies including Terraform, AWS, Node.js, C# and Python, but we do not expect you to know everything from day one. In this role, you will work closely with engineers, Tech Leads, Engineering Managers, Senior Principal and a Head of Engineering to improve our platform and deliver meaningful infrastructure change. In this role as the Senior Platform Engineer, you will... 🚄 * Deliver complex improvements to Trainline’s engineering platforms, helping us build scalable, reliable and secure infrastructure that supports teams across the business. * Implement and evolve infrastructure changes using Terraform, following existing module patterns while identifying opportunities to improve quality, maintainability and automation. * Apply least-privilege and secure-by-default principles consistently across AWS accounts, helping ensure our infrastructure meets Trainline’s standards for security and operational excellence. * Build or contribute to automation scripts and tooling using Node.js or Python, supporting faster, safer and more repeatable delivery. * Support and review the work of mid-level engineers, sharing context, providing constructive feedback and helping others deliver confidently. * Collaborate with Tech Leads, Delivery Managers and cross-functional stakeholders to shape delivery plans, achieve milestones and manage dependencies. * Identify risks, blockers or quality concerns early, helping to unblock the team and keep delivery moving in a clear and sustainable way. * Test, validate and deploy infrastructure changes through CI/CD pipelines, ensuring deliverables are robust, well-documented and production ready. We'd love to hear from you if you have... 🔎 * Strong experience working with AWS services such as ECS, Lambda, IAM or CloudFront, with a solid understanding of operational and security best practice. * Proven experience delivering infrastructure changes using Terraform, ideally in complex or large-scale cloud environments. * The ability to work independently on complex platform engineering problems while bringing others along through clear communication and collaboration. * Experience using Node.js or Python for automation, scripting or integration work, with a focus on practical, maintainable solutions. * A good understanding of secure cloud design, including least privilege, account structure and service-to-service authentication approaches such as OIDC. * Experience using AI tooling to support day-to-day engineering work, such as coding, code review, research or productivity improvements. * A track record of delivering outcomes in agile, delivery-focused teams, with the confidence to raise risks, clarify priorities and support shared progress. * Helpful experience with areas such as multi-account or multi-region AWS management, CDN, WAF, Git-based CI/CD pipelines or enterprise-scale AWS environments. More information: Enjoy fantastic perks like private healthcare & dental insurance, a generous work from abroad policy, 2-for-1 share purchase plans, an EV Scheme to further reduce carbon emissions, extra festive time off, and excellent family-friendly benefits.  We prioritise career growth with clear career paths, transparent pay bands, personal learning budgets, and regular learning days. Jump on board and supercharge your career from day one!  We're operating a hybrid model and ask that Trainliners work from the office a minimum of 60% of their time over a 12-week period. We also have a 28-day Work from Abroad policy. Our values represent the things that matter most to us and what we live and breathe everyday, in everything we do:  * 💭 Think Big - We're building the future of rail  * ✔️ Own It - We focus on every customer, partner and journey  * 🤝  Travel Together - We're one team  * ♻️ Do Good - We make a positive impact  We know that having a diverse team makes us better and helps us succeed. And we mean all forms of diversity - gender, ethnicity, sexuality, disability, nationality and diversity of thought. That's why we're committed to creating inclusive places to work, where everyone belongs and differences are valued and celebrated. Interested in finding out more about what it's like to work at Trainline? Why not check us out on LinkedIn, Instagram and Glassdoor!