AI Software Engineer

X-on Health; Woodbridge; Hybrid; GBP 32,000 - 39,000; Full time

Benefits offered by this job

25 Days Holiday

Birthday Day Off

Cycle to Work Scheme

Winter Flu Jabs

Free On-Site Parking

Learning & Development budget

Job summary

X-on Health in the United Kingdom is seeking a Software Engineer to help build the infrastructure powering our NHS-focused call experiences and data insight tools. You’ll work on greenfield projects involving real-time voice agents and orchestrate Telephony, STT, LLMs, and TTS for our products.

The role requires several years’ industry experience and a strong backend foundation, primarily in Go, with opportunities to cross-train from other languages.

Qualifications

• Several years’ experience in industry.
• Strong backend development background with Go or willingness to cross-train from C++/Java/Rust/Python.
• Experience with RESTful APIs and JSON data structures.

Responsibilities

• Work within a small agile team to solve technical challenges, develop new functionality and make non-functional improvements to our products and services.
• Understand business requirements and translate them into technical design and development tasks.
• Participate in architectural and design discussions and diagnose complex technical issues; troubleshoot.
• Collaborate with stakeholders to progress and report on projects and tasks.
• Build Voice Agents: Developing and maintaining our Go-based Voice Agent.
• Develop API integrations for our unified AI API.gateway between telephony products and AI providers.
• Create Tools to enable LLMs to access real-world data (RAG, clinical system integrations).
• Build pipelines to transcribe and analyse historical call recordings for sentiment, summary, and outcomes.
• Refine system prompts to ensure safety, accuracy and empathy for healthcare contexts.
• Keep up with AI landscape and prototype new models for product applications.
• Optionally contribute to AI infrastructure for self-hosted models.
• Develop tooling to support testing and evaluation against provider models.

Skills

Go (Golang)

WebSocket

REST APIs

AI/LLM exposure

Telephony/VoIP

Real-time data processing

Unit tests

Team collaboration

Tools

GitLab

MySQL

Redis

PHP + Laravel

React

OpenSIPS

FreeSWITCH

Job description

Salary: Up to £35,000 depending on experience

Hybrid- Office based Monday, Wednesday and Friday

We are looking for a Software Engineer to join our expanding team. You will help build the infrastructure that powers our next generation of call experiences and data insight tools for our NHS customers. You will have several years’ experience in industry.

You will be working on greenfield projects involving real-time voice agents, managing the orchestration between Telephony, Speech-to-Text, LLMs, and Text-to-Speech services to help our product team to realise their vision. You will also help develop pipelines to analyse call recording data at scale, extracting vital insights on performance and customer satisfaction. This is a multi-discipline role well suited to an individual with the ability to think on their feet and who learns quickly.

Responsibilities:

• Work within a small agile team to solve technical challenges, develop new functionality and make non-functional improvements to our products and services.
• Understand business requirements and how they translate into technical design and development projects and tasks.
• Participate in architectural and design discussions and diagnose and troubleshoot complex technical issues
• Work with stakeholders to progress and report on projects and tasks
• Building Voice Agents: Developing and maintaining our Go-based Voice Agent
• API Development: Contributing to our unified AI API that acts as the gateway between our telephony products and various AI providers
• Tool Creation: Developing "Tools" (Function Calling) that allow LLMs to interact with real-world data, enabling features such as consultant lookups (RAG) and clinical system integrations
• Data Insights: Building pipelines to transcribe and analyse historical call recordings to extract sentiment, summary, and outcome data
• Prompt Engineering: Refining system prompts to ensure our agents are safe, accurate, and empathetic in a healthcare context.
• Learning and Development: Keeping up to date with the rapidly changing AI landscape (e.g. exploring new models) and prototyping how they can be applied to our products
• Operations: Optionally contribute to our AI infrastructure to help operate self-hosted open-source models
• Testing & Validation: Development of tooling to assist our Test Team in conducting evals against our many provider models to ensure we are continually optimising for quality and cost

Our core tech stack:

• GitLab
• MySQL
• Redis
• PHP + Laravel
• React
• Electron
• Puppet (build and deploy)
• OpenSIPS
• FreeSWITCH
• Programming Proficiency: Strong foundation in a backend language. Our stack is primarily Go (Golang), so experience with Go or a strong willingness to cross-train from C++/Java/Rust/Python is required
• API Integration: Experience consuming RESTful APIs and understanding of JSON data structures
• AI/LLM Exposure: Practical experience interacting with LLM APIs (OpenAI, Anthropic, etc.) and understanding concepts like Context Windows, RAG, System Prompts, and Temperature
• Concurrency: Understanding of asynchronous programming (WebSockets, goroutines) is highly beneficial given the real-time nature of voice data
• Several years experience in industry
• A team player who shows initiative
• Experience with LLM guardrails and PII-redaction
• Understanding of LLM tool development and MCP
• Knowledge of Speech-to-Text (STT) or Text-to-Speech (TTS) technologies
• Experience with WebSockets and streaming data
• Familiarity with Telephony/VoIP

Other Skills Required:

• Competent in primary tech stack
• Confident with computer science basics (algorithms, data structures, complexity, design patterns)
• Is productive with the basic tools in their discipline Key Skills
• Can contribute to an existing framework and is able to deliver small stories
• Adheres to test coverage standards
• Regularly applies learnings from past experience
• Collaborating with team members and is flexible and open to change
• Write unit tests and integration tests to ensure code quality
• Participate in code reviews and ensure adherence to coding standards
• 25 Days Holiday
• Birthday Day Off
• Buy Holiday Scheme
• Cycle to Work Scheme
• Winter Flu Jabs
• Free On-Site Parking
• Learning and development budget with Professional Qualification Support
• Social benefits (paid social events)

SCG is proud to be an equal opportunities employer.

We welcome applications from all parts of the community and are committed to upholding the principles of the Equality Act 2010.

We are committed to supporting applicants with disabilities. We will endeavour to make necessary adjustments to ensure a fair and accessible recruitment process.