Join a team redefining how people live, rent, and move around the world. The Flex is building a seamless, tech-driven rental experience designed to be instant, flexible, and frictionless—powered by intelligent automation and a global-first mindset.

This isn’t a typical engineering role. You’ll be shaping the technical foundation of a fast-growing platform, working across the stack, and building real systems that power bookings, payments, and global property operations at scale.

What You’ll Be Doing

• Design and build core platform architecture from the ground up, covering bookings, payments, availability, and guest experience
• Develop full-stack systems including web apps, APIs, automation workflows, and cloud infrastructure
• Create event-driven systems to automate operational processes and improve efficiency
• Integrate with key platforms such as Airbnb, Stripe, Hostaway, and Twilio
• Deploy, monitor, and iterate on production systems with a focus on performance and reliability
• Solve complex, real-world challenges like real-time booking sync, pricing intelligence, and operational dashboards
• Define engineering standards, best practices, and contribute to building a strong technical culture

What We’re Looking For

• Strong experience building production-grade systems (backend or full-stack)
• Comfortable working across APIs, web applications, and cloud infrastructure
• Experience with modern frameworks such as FastAPI, React, and AWS (or similar)
• A bias toward action, with the ability to ship quickly and iterate based on feedback
• Comfortable working in fast-paced, ambiguous environments
• Strong ownership mindset with a focus on delivering real impact

Why Join The Flex

• Foundational role with direct impact on the company’s long-term direction
• High ownership and autonomy in decision-making
• Fast feedback loop—what you build gets used quickly
• Competitive compensation with long-term upside
• Remote-first environment with flexibility and trust at its core

If you’re looking to build from zero to one, take ownership of meaningful systems, and play a key role in shaping a global platform, this is an opportunity to do exactly that.

We’re focused on building high-quality, reliable software and are looking for ambitious engineers who take full ownership across the development lifecycle — from identifying opportunities and designing solutions to shipping features and ensuring they deliver real value for customers.

This is a hands-on engineering role where you’ll contribute to business-critical systems, working on scalable infrastructure, intelligent automation, and high-performance backend services.

What You’ll Work On

• Build AI-powered approval workflows that adapt to complex enterprise requirements, translating natural language rules into structured, auditable business logic
• Develop intelligent automation tools, including collections agents that manage payment follow-ups and escalation workflows autonomously
• Scale billing and revenue infrastructure to support significant growth, optimising for performance, cost-efficiency, and reliability
• Design and implement distributed systems that process high-volume, real-time event streams
• Make architectural decisions that balance scalability, resilience, and operational efficiency
• Build and maintain infrastructure where accuracy and uptime are critical to business operations

Recent Product Deliveries

• Watchtower: a centralised control hub for AI agents, including automated contract intake and data extraction for billing workflows
• Integrated e-signature solution for seamless quote-to-signature experiences, reducing friction in deal closure
• Role-Based Access Control (RBAC) system to manage permissions across APIs and user interfaces

About the Team

You’ll be joining a fast-growing, high-performing engineering team, scaling towards 20+ developers. This is an opportunity to influence core architecture decisions while working on products already relied on by real customers.

What We’re Looking For

• Proven experience building and deploying production-ready backend systems
• Strong focus on reliability, performance, and maintainability
• Interest in distributed systems and scalable architecture
• Ability to take ownership of features from concept through to delivery
• Customer-focused mindset, with an understanding of real-world use cases
• Comfortable working in fast-paced environments with evolving requirements
• Strong communication skills and collaborative approach

Desirable Skills

• Deep understanding of relational databases and complex query optimisation
• Experience building high-performance data-driven applications

This role is ideal for engineers who want to build impactful systems, work on cutting-edge automation, and play a key role in shaping scalable, revenue-critical infrastructure. If you are interested in this Product Engineer job in London, please apply today!

Hexwired has partnered with a leading organisation within the financial services sector, seeking a Senior Software Engineer to join their Risk Technology team. This is a hands-on role combining deep technical expertise with engineering leadership, focused on building secure, scalable, and enterprise-grade platforms. You will play a key role across the full software development lifecycle, contributing to architecture, development, testing, and deployment of critical risk systems and data platforms.

Key Responsibilities:

• Contribute to the architecture, development, testing, and deployment of Risk systems and data platforms
• Take ownership of the SDLC, delivering clean, secure, and maintainable code
• Promote engineering excellence through code reviews, optimisation, and best practices
• Drive automation across build, testing, and deployment processes
• Provide technical leadership, mentoring engineers and fostering continuous improvement
• Design and enhance CI/CD pipelines for secure and stable releases
• Support scalable and resilient system design, evaluating new technologies
• Champion AI, ML, and automation to improve development and testing efficiency
• Implement automated testing strategies within CI/CD frameworks
• Collaborate with Product, Architecture, Risk, and Support teams to ensure smooth delivery

Key Skills & Experience:

• Strong experience with C#, Java, and .NET technologies
• Deep knowledge of ASP.NET, MVC, Razor, and JavaScript
• Proficiency in scripting (PowerShell, Python, Groovy, or Shell)
• Hands-on experience with CI/CD tools (Jenkins, TeamCity, Git, Nexus)
• Experience with messaging technologies (WCF, gRPC, SignalR, RabbitMQ)
• Proven experience within investment banking or Risk Technology environments
• Strong stakeholder management and communication skills
• Analytical, solution-focused, and able to perform in fast-paced environments

This is an exciting opportunity to join a forward-thinking organisation at the forefront of financial technology, offering a competitive salary and excellent benefits package depending on experience. If you’re interested in this Senior Software Engineer job in London, please apply.

For more information on this role, or other opportunities across C#, Java, DevOps, Data Platforms, Machine Learning, or Software Engineering, get in touch today.