Lead Software Engineer

You’ll be a technical leader on the Client Experience team https://karbonhq.com/clients/. Someone who can hold the big picture while staying hands-on in the code. You’re frontend-anchored with deep React expertise, comfortable driving mobile architecture decisions, and able to contribute confidently to our .NET Core...

You thrive in a collaborative, autonomous environment, take genuine ownership of the product and its impact on customers, and are energised by both shipping new features and improving the systems that already exist.

Shipping new features and iteratively enhancing existing systems across web, mobile, and backend surfaces, prioritizing reliability and exceptional user experience.
Drive architectural decisions for new services, balancing long-term scalability and maintainability with the need for rapid delivery in a multi-stack environment.
Partner closely with product managers and designers from the earliest stages of solution design: shaping problems, challenging assumptions, and defining the right approach before implementation and help break work for your team.
Own the technical backlog by ideating, prioritizing, and delivering on technical initiatives while communicating trade-offs clearly to stakeholders.
Champion observability and reliability by defining meaningful dashboards, alerts, and SLOs to ensure our services remain healthy in production.
Set the standard for pragmatic engineering, demonstrating the judgment to know when to move fast and when to invest in robustness.
Leverage AI tools thoughtfully to accelerate delivery while always applying human oversight to what ships.
Mentor and grow engineers through code reviews, pairing, and coaching, fostering a collaborative culture where the whole team improves.
Work with autonomy, taking ownership of problems and bringing clear recommendations rather than waiting for predefined answers.
Proven track record of technical leadership in both new feature development and maintaining existing systems.
Deep React expertise with a frontend-anchored focus, setting the standard for frontend craft on the team.
Strong TypeScript proficiency and a solid understanding of modern JavaScript and browser standards (HTML/CSS, DOM API, ES modules).
Ability to drive mobile architecture decisions across React Native. You’ve designed systems across both web and mobile surfaces and can guide the team’s mobile direction, not just review mobile code.
.NET Core (C#, Web API). Demonstrated senior-level depth in backend systems and container-based architecture, comfortable taking full ownership of a service without requiring dedicated backend leadership.
Experience owning a technical backlog: ideating, scoping, prioritising, and delivering with the team.
Proven track record of delivering features end-to-end - from technical scoping and design through to production - with the communication skills to set clear direction, align the team, and keep stakeholders informed throughout.
Experience leading or mentoring engineers in a collaborative, distributed team environment.
RESTful API design experience and solid relational database thinking - you understand how data flows through a system and can reason about query patterns and schema design, regardless of the specific tooling.
Strong understanding of scalable system design, software architecture, data structures, and algorithms.
Solid command of the full software development lifecycle - including testing strategies, CI/CD, deployment pipelines, and operational practices.
Demonstrated enthusiasm for AI-assisted development. You actively use AI tools in your workflow and can articulate how they enhance productivity and code quality.
Excellent communication skills; able to articulate technical decisions clearly to both engineering and non-engineering stakeholders across timezones.
A Bachelor’s degree in Computer Science or equivalent practical experience.

Hands-on experience with React Native and Expo, including: build, release, and distribution pipelines (App Store, Google Play, or EAS Build).
Familiarity with containerisation (Docker/Kubernetes) and cloud platforms (Azure a plus).
Hands-on experience with DataDog, Azure, or equivalent observability and cloud tooling
Understanding of i18n and accessibility standards for web and mobile applications.

We build modern, scalable software on a polyglot stack suited to a client-facing product:
Frontend: React and TypeScript - our primary web application platform.
Mobile: React Native with Expo - cross-platform apps for iOS and Android.
API layer: Node.js BFF - a thin orchestration layer
Backend services: .NET Core (C#, Web API) microservices deployed in containers and Karbon's shared .NET/SQL Server platform 
Cloud: Microsoft Azure, including containerised deployments.
Observability: DataDog - metrics, logging, alerting, APM, and dashboards.
Source control & CI/CD: GitHub with GitHub Actions.

Our architecture continues to evolve as we scale. If you care about clean service boundaries, reliable systems, and shipping with confidence, you’ll feel right at home here.
AI is reshaping how software gets built, and at Karbon we’re fully committed. We don’t see AI as a replacement for engineers. We see it as a force multiplier that will elevate creativity, impact and capability to levels we’ve barely begun to imagine. We’re looking for developers who are confident in their fundamentals, driven to grow, and excited to harness AI to build something meaningful. If you’re energized by this future rather than cautious of it, you’ll feel right at home here.