AI Builder

Job Title: AI Builder (multiple grades)

Location: London (Hybrid – remote and client site as required)

Company: Casci

Salary: £30,000 – £75,000 (depending on experience)

Contract: Full-time, permanent

We’re a Workflow & AI Orchestration Specialist.

We deliver workflow and orchestration solutions that modernise casework, data, and citizen services. We connect fragmented systems to create coherent experiences with AI agents deployed safely at scale.

We operate across two pillars: Advise and Implement to provide end-to-end technology solutions that integrate cutting-edge orchestration and agentic AI capabilities.

We’re growing fast and looking for bright people to help build our business.

ROLE OVERVIEW

We're looking for an AI Builder to join our growing team: someone who builds AI and agentic AI systems that solve real-world problems.

Here at Casci we’re solving two broad AI questions:

1. How can we build and integrate AI and agentic AI systems into wider solutions that solve client problems effectively and at scale?
2. How can we build an AI-native consultancy where our own delivery is augmented as much as possible by AI and agentic AI?

Historically building these systems would have required deep machine learning and AI engineering expertise, but agentic coding and high-performance generalised reasoning models are changing that.

We build solutions using APIs, self-hosted models, agentic frameworks and builders integrated into other technologies. We deploy and scale on our own or client cloud infrastructure. We use third-party products and integrations where useful, but also design and build bespoke systems when required or commercially sensible. We generally build backend systems in Python, increasingly leveraging agentic coding tools to focus less on coding itself and more on building at the system level.

Core to all of this is navigating poorly defined and open-ended questions. We seek candidates who build quickly whilst ensuring systems are well designed and extensible; balance speed with engineering quality, avoiding overengineering before productionising and scaling proven solutions; work with clients and end users to understand problems and iterate towards outcomes; and remain curious across a rapidly evolving landscape.

We are keen to consider candidates from diverse backgrounds in academia and industry, including machine learning and AI engineers, software developers looking to focus on AI, product designers and architects moving into technical delivery, and technical researchers (physics, mathematics, computer science etc.) moving into applied development and delivery.

We are also open to different levels of experience and seniority, reflected in the wide salary bracket. Most important is experience and interest in building these systems, technical understanding, and curiosity and motivation to keep learning.

KEY RESPONSIBILITIES

• Work directly with the Head of AI & Data to design, develop, deploy and scale AI and agentic AI systems for clients and internally at Casci.
• Collaborate with service designers, engineers and business analysts to identify and frame AI use cases.
• Build rapid proofs of concept (PoCs) and prototypes to demonstrate solutions, test feasibility, gain feedback and gauge usefulness.
• Work with engineering teams to productionise and scale AI and agentic systems within wider products and platforms.
• Iterate and improve deployed AI and agentic systems to improve performance, quality, robustness, resilience and cost, and extend features.
• Build solutions using agentic coding tools, with a strong eye on system design and quality.
• Advise on AI strategy, adoption and scaling for clients.
• Contribute to internal R&D, tooling, thought leadership and Casci's AI proposition.
• Support bids and client engagements where AI capability is a key differentiator.
• Help maintain awareness of and critically analyse the evolving AI landscape, at both model/product and business/strategic levels.

ESSENTIAL SKILLS AND EXPERIENCE

• Demonstrable experience building systems that incorporate AI and/or agentic AI, whether in industry, academic or personal projects.
• Some technical knowledge and experience, either foundational (e.g. mathematics, statistics, computer science) or applied (programming, software development).
• Experience and proficiency developing in Python, including wider system design principles.
• Some experience developing with agentic coding tools (e.g. Claude Code, OpenAI Codex).
• Strong system-design judgement: structuring systems so you understand how they work, even when you didn't hand-write every line, and know how to test and prove them.
• Willingness and ability to work through open-ended, uncertain problems, exploring the solution space and iterating quickly towards useful outcomes.
• Strong curiosity and the drive to learn fast and critically, across technical and non-technical topics.
• Strong analytical and problem-solving skills, with the ability to translate exploration into practical outcomes.
• Excellent written and verbal communication, able to explain complex AI concepts to non-technical audiences.
• Must be eligible and prepared to go through SC Security Clearance.

DESIRABLE SKILLS AND EXPERIENCE

• Experience consulting for or working in UK public-sector organisations, or client-facing delivery more generally.
• Experience taking AI solutions from proof of concept into production-grade systems deployed at scale.
• Experience in cloud-based development and deployment, e.g. AWS, GCP.
• Experience with agentic AI frameworks, orchestration tooling and workflow builders.
• Understanding of ethical AI, governance frameworks and public-sector AI standards.
• Holds UK security clearance.

WHAT WE OFFER

• Meaningful missions. Tackle high-impact public-sector problems that improve services millions rely on.
• Hybrid working. Flexible working between our London office, client offices and your home.
• Outputs over optics. We focus on what gets delivered, not hours online.
• Work shoulder-to-shoulder with founders. Learn from experienced practitioners in a nurturing, hands-on environment.
• Shape the organisation. Your fingerprints will be on the company as it grows.
• Autonomy by default. We empower our people to do what's needed.
• Human > corporate. Sociable, low-ego, dynamic engagements. No big-firm stiffness or needless bureaucracy.
• Professional development. We invest in our people through training and certifications.

HOW TO APPLY

Email us at [email protected] with the subject line “AI Builder” and show us why you're the right person. This can include a CV and cover letter, but even more powerful will be showing us something you've built.