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Principal Software Engineer (Platforms)
Job Location:
Monthly Salary:
Posted:
29 September 2026 (Yesterday)
Posted:
Application Deadline:
27 December 2026
Application Deadline:
Vacancies:
1 Vacancy
Vacancies:
Department:
Job Summary
Were building the UKs next generation engineering powerhouse providing critical technology that strengthens national security and resilience.
We specialise in turning advances in sensing AI and communications into operational capability for the edge where connectivity may be degraded or denied. Our work focuses on accelerating the deployment of technology improving decision-making for frontline teams and protecting people and critical assets in demanding environments.
Headquartered in Bristol Rowden employs around 200 people and operates over 20000 square feet of engineering and manufacturing facilities. We have a growing international footprint and are one of Europes fastest-growing engineering businesses.
About the role
We are looking for a Principal Software Engineer to build the Internal Developer Platform that our engineering teams depend on - a platform built from the ground up for agentic engineering. Our software teams work on hard problems under tight deadlines. Your job is to make sure the platform underneath them is not one of those problems.
Working within the Platforms team you will architect and own the tooling infrastructure workflows and components that Rowdens developers build on. That means repeatable development environments paved paths that are faster than the alternatives and platform services that teams adopt because they want to not because they have to.
You will lead the implementation of agentic AI and passionately advocate for its use: rolling out coding agents embedding them into CI/CD and day-to-day development and building the harnesses and infrastructure that let them run securely efficiently and transparently. You will track new developer tooling and agentic AI closely adopt what works before most teams have heard of it and enjoy convincing others to do the same. This role gives you a whole engineering organisation to do that for.
This is some of the highest-impact engineering in the company. It is not a delivery role. You will not be assigned to customer projects and you will not review delivery PRs. Your users are Rowden engineers and the platform is the product.
Candidates must be eligible for SC clearance.
More information about security clearance is available here:
Salary
For senior roles compensation is tailored to the scope of the role and the specific experience a candidate brings. Because that can vary significantly we do not always publish a fixed salary band. We will however discuss compensation openly at the first stage of the process and can share an indicative range before either side invests significant time.
Salary
For senior roles compensation is tailored to the scope of the role and the specific experience a candidate brings. Because that can vary significantly we do not always publish a fixed salary band. We will however discuss compensation openly at the first stage of the process and can share an indicative range before either side invests significant time.
Key areas of responsibility
As a Principal Software Engineer at Rowden you will:
- Build the Internal Developer Platform: design build and run the platform that Rowdens software teams and their coding agents depend on to write test ship and operate code.
- Own software engineering infrastructure and workflows end-to-end: source control CI/CD artefact management secrets and the environments our software runs in.
- Champion new tooling and best practice: track what the best engineering organisations are doing evaluate it rigorously and bring in whatever earns its place.
- Raise standards through influence: set technical direction and standards across teams you do not manage by building things that people choose to use.
- Lead the implementation of agentic AI: roll out coding agents across engineering workflows and own how and where theyre used.
- Advocate for agentic engineering across the business: run evaluations evidence the benefits and train teams on effective use.
- Build the infrastructure that makes agents trustworthy: sandboxing permissioning audit logging and observability so that what an agent did is efficient secure and fully transparent to the engineer who has to stand behind it.
- Create repeatable development environments: make local cloud and target-representative environments reproducible quick to stand up and identical for every engineer.
Key skills experience and behaviours
We dont expect anyone to be a 10/10 in every area and you dont need to tick every single bullet point to apply. What follows is a list of the skills and experience that we think matter most for this role. Different strengths are welcome.
- Substantial experience as a principal or staff software engineer.
- Demonstrable experience building developer platforms internal tooling and paved paths used by engineering team.
- Hands-on experience implementing agentic AI in real engineering workflows (beyond individual experimentation).
- Experience designing the guardrails around agentic AI: sandboxing permissioning audit logging or observability for tools operating with elevated access.
- Deep hands-on experience of CI/CD infrastructure as code containers and Kubernetes.
- Experience of building and deploying reproducible development environments.
- A track record of driving adoption by persuasion and good product decisions not mandate.
- Clear written communication including documentation that engineers actually read.
About you
- You treat the platform as a product and your colleagues as customers and you measure yourself on their throughput rather than your own.
- You notice friction that everyone else has learned to live with and you fix it.
- Youre a genuine advocate for agentic engineering. You make the case for it with evidence help teams adopt it well and are honest about where it isnt the right tool.
- You are opinionated about tooling and you change your mind when the evidence changes.
- You are comfortable owning something long-lived rather than moving between projects.
- You can tell the difference between a genuinely better tool and a fashionable one.
- You are honest about trade-offs including the ones in your own work.
No prior defence experience is required. Were interested in people whove built and run developer platforms in demanding environments wherever that was.
Working at Rowden
We are committed to building a flexible inclusive and enabling company. Our aim is to create a diverse team of talented people with unique skills experience and backgrounds so please apply and come as you are!
We also recognise the importance of flexible working and support this wherever we can. We typically operate a flexible hybrid-working model with an average 3 days in the office each week (dependent on the role). We welcome the opportunity to discuss flexibility part-time working requirements and/or workplace adjustments with all our applicants.
Rowden is a Disability Confident Committed company and we actively encourage people with disabilities and health conditions to apply for our roles. Please let us know your requirements early on so that we can make sure you have everything you need up front to help make the recruitment process and experience as easy as possible.
Finally if you feel that you dont meet all the criteria included above but have transferable skills and relevant experience wed still love to hear from you!
Required Experience:
Staff IC
About Company
Rowden designs and builds systems, infrastructure, and applications to deliver mission advantage to those working to protect the security of the UK and its allies. We are setting a new standard in government technology provision: hyper-efficient engineering, better customer relationsh ... View more
