Software Engineer (Developer Tooling) in Belfast

We’re seeking a platform-minded software engineer to build and own the developer-facing tools that sit at the heart of how engineers integrate with Cloudsmith.

About Cloudsmith

Cloudsmith is transforming how organizations handle software artifacts and secure their supply chains. As a fully managed multi-tenant Software as a Service (SaaS) platform, we enable organizations to build software better, through best-in-class artifact management and software supply chain security. Our vision is to become the software supply chain itself, powering the future of software delivery. We are the world's most potent artifact management platform, built by developers for developers. Our platform supports over 30 formats spanning languages, container formats, and operating systems, with enterprise-grade features, including vulnerability and security scanning, world-class policy management and enforcement, and web-scale to handle the Fortune 500. Organizations integrate Cloudsmith as critical infrastructure into their development, deployment, and distribution pipelines, trusting us to protect and accelerate, no matter the scale. Backed by top-tier investors and on a trajectory toward IPO and beyond, we're building mission-critical infrastructure that powers software delivery for organizations worldwide. We operate at the cutting edge of cloud-native technology, tackling complex distributed systems challenges that directly impact millions of developers. Now is an exciting time to join us as we revolutionize how organizations deliver and secure software and help write the next chapter of our rocketship growth story.

The Role

In this role, you'll be responsible for building and maintaining the tools that many of our customers use every single day - in some cases, they're the only part of Cloudsmith that those engineers ever touch. That means the CLI, Terraform provider, MCP integration, IDE extensions, and more. These are durable, platform-grade interfaces that need to evolve carefully and responsibly alongside the core Cloudsmith platform - built to last, and owned for the long term. You’ll work closely with Customer Success, Solutions Engineering and real external customers to make sure what you build reflects how developers actually work in the wild. If you love building tools that other engineers rely on, think carefully about interface design and ergonomics, and get satisfaction from making complex things feel simple - this role is for you.

Key Responsibilities

• Build and maintain Cloudsmith's developer-facing integrations - including the CLI, Terraform provider, MCP server, and IDE/LSP extensions - treating them as first-class platform products.
• Design interfaces that stand the test of time. You'll think carefully about versioning, backwards compatibility, and the downstream impact of every change you ship, because thousands of engineers will have these tools embedded in their workflows.
• Own the full software development lifecycle for your work - from design and development through testing, release, and long-term support - aligned with Cloudsmith's engineering standards and practices.
• Stay close to the platform. You'll work in lockstep with the broader engineering organization to ensure developer tooling keeps pace with platform evolution, and surface any integration concerns early.
• Turn customer feedback into durable solutions. Working with Solutions Engineering and Customer Success as internal stakeholders, you'll translate real-world pain points into general-purpose tooling improvements that scale across the entire customer base.
• Champion developer experience. You'll bring strong opinions about what makes a CLI, SDK, or IDE plugin a joy to use, and advocate for the user - the software engineer - at every step.
• Contribute to a culture of automation. If something can be automated - testing, releases, validation, the works - you'll help make it so.

Required Experience, Qualities & Skills

• 3+ years of professional software engineering experience, with a track record of shipping and maintaining production-grade software.
• Strong API and interface design instincts. You understand the cost of a breaking change, know how to version things sensibly, and design with the consumer of your interface front of mind.
• Proficiency in at least one strongly-typed language (Go, Python, TypeScript, or similar) and comfort picking up others as needed. Cloudsmith's CLI and tooling surface spans multiple languages and environments.
• Security awareness. You understand secure coding practices, and you're comfortable thinking about how credentials, tokens, and access patterns flow through the tools you build.
• Familiarity with CI/CD ecosystems and modern DevOps toolchains - the environments your tools will live in.
• Clear, confident written communication. You can write a well-reasoned RFC, a sensible changelog, and a README that developers actually read.
• A genuine empathy for other engineers as users. You've felt the frustration of a bad CLI or a confusing SDK, and you bring that lived experience into how you build.

Nice to have:

• Hands‑on experience building or contributing to developer‑facing tooling - CLIs, SDKs, Terraform providers, language server protocols, IDE extensions, or similar. You don't need to have built all of these, but you should feel at home in this ecosystem.
• Experience with AI‑assisted development tools and workflows, and an interest in how they’re reshaping the way engineers build software.

Cultural Values We're Looking For

• Automate everything. We believe that if it can be automated, it should be. You'll apply this to your own work - releases, testing pipelines, validation - and help raise the bar for the whole team.
• Collective ownership. You'll take responsibility for what you build long-term, respond when things break, and treat the entire platform as something you have a stake in - not just your corner of it.
• Transparency. We share what's working and what isn't, openly. You'll be honest about tradeoffs, flag problems early, and communicate progress in a way that keeps stakeholders - internal and external - genuinely informed.
• Bias for action. We believe in pragmatism first, perfection later. You'll know when to move quickly with a good solution rather than waiting for an ideal one, and you'll build the kind of instincts that make that call reliably.
• Just better. We believe everything can and should be improved upon. You'll bring a continuous improvement mindset to your work - questioning defaults, proposing refinements, and raising the bar without being precious about it.
• Customer collaboration. We stay close to the people who use what we build. You'll treat customer feedback as a genuine input to your work, and care deeply about the experience of the engineers on the other side of your tools.

Impact & Opportunity

This role offers the chance to directly shape the developer experience for one of the most critical layers in the software supply chain. As a member of a newly established squad with a clear mandate and growing capacity, you'll have meaningful influence over the tools, standards, and culture from day one. From startups to Fortune 500 companies, your work will directly impact how organisations control and secure their software supply chains.

Growth & Development

This is a foundational hire for a new squad, which means the growth ceiling is high. As the team matures and the scope of the roadmap expands, there is a clear pathway for growth. For engineers who love the craft and want to go deeper, there's a natural progression toward a senior or staff engineering track - owning architectural decisions, mentoring newer engineers, and shaping the technical direction of developer tooling as a platform capability.

Benefits, Location & Work Environment

Note: You must be based in Ireland or the United Kingdom and have the right to work independently without requiring sponsorship.

• A position based in Ireland or the United Kingdom.
• A competitive compensation package, including equity.
• Comprehensive health, dental, and vision insurance.
• Generous annual leave and flexible working policies to suit your lifestyle.
• A professional development budget for conferences and training.
• A dynamic, innovative, trust-centric, and supportive work environment.
• The opportunity to shape a fast-growing Series B startup (and beyond).
• Regular (monthly-ish) travel may be required for team meetings.
• Regular (quarterly-ish) travel may also be required for events and customers.

Health and Wellness

Regardless of your location, we deeply care about the health and wellness of our staff and their families; a sustainable pace is important to us. In addition to generous annual leave (PTO), we offer health and wellbeing benefits along with flexible family-friendly working policies.

Personal Growth

You will have an enormous opportunity to learn new skills alongside your colleagues, and your continued professional development is essential to us because it's important to you. We will support you with budgets for equipment, training, books, conferences, travel, and certifications. The more powerful you become, the better for all of us.

Facilities

Cloudsmith is headquartered in Belfast, Northern Ireland, with fully‑equipped office space that’s open 24x7. We use our H.Q. regularly for activities like working sessions, team planning, meets and greets, and sometimes other group activities (like games!). We also hold all-hands offsites in Belfast thrice yearly, with guest speakers and team activities. Many Cloudsmithers work remotely, so we rely on our online collaboration tools; Slack, Google Docs, Linear, and other popular collaboration tools are how we work.

About Equal Opportunity

Cloudsmith is an equal‑opportunity employer proud to nurture a diverse workplace that welcomes applications from individuals of all races, genders, and ethnic groups. We do not discriminate on age, religion, sexual orientation, citizenship status, military service, or health conditions. We will not tolerate discrimination of any kind within our workforce.