Software Engineer (Agents)

Mirage; York and North Yorkshire; On-site; GBP 70,000 - 110,000; Full time

Benefits offered by this job

Flexible resources

Medical/dental/vision

Team off-sites

Job summary

Mirage in the United Kingdom seeks a senior engineer to design and ship agentic systems powering creative workflows for AI agents. You will own end-to-end ML pipelines, collaborate across product, ML, and systems teams, and help shape how agents act on user needs.

You’ll implement context gathering, tool selection, and multi-step planning, integrate state-of-the-art models, and continuously evaluate production systems to improve reliability and user outcomes.

Qualifications

• 5+ years of professional industry experience.
• Experience building ML systems or agentic pipelines in production.
• Experience with multi-agent architectures.
• Experience fine-tuning LLMs for specific use cases.

Responsibilities

• Design and build end-to-end agentic systems for creative workflows.
• Own modules across product, ML, and systems engineering.
• Integrate state-of-the-art models and external capabilities.
• Measure agent quality in production using evaluation frameworks.
• Experimentation and iteration to guide improvements.

Skills

Agentic systems

LLMs

RAG

Context management

Multi-agent architectures

Fine-tuning

Evaluation systems

ML pipelines

Startup experience

Job description

• This role focuses on designing and building agentic systems that power creative workflows for short-form video. You’ll help shape how AI agents reduce friction, accelerate learning, and unlock new creative possibilities for our users — building agents that can take creative actions on a user’s behalf — while experimenting with emerging models and techniques to bring these experiences to life in production
• Software Engineers on the agents team work across product, machine-learning, and systems engineering — owning meaningful problems end-to-end and helping define how our agents are built and deployed across the product
• Build and ship end-to-end agentic systems that meaningfully improve creative workflows, balancing quality, performance, and reliability
• Design agent architectures — how agents gather context, plan, select tools, and execute creative tasks reliably at scale
• Integrate state-of-the-art models, combining internal research and external capabilities to power new agent experiences
• Measure and improve agent quality in production, using experimentation, evaluation frameworks, and real-world feedback to guide iteration

Benefits

• Anything you need to do your best work
• Comprehensive medical, dental, and vision plans
• We’ve done team off-sites to places like Paris, London, Park City, Los Angeles, and Nashville with more planned in the future

While we don’t use hierarchical titles or levels internally, we are currently hiring engineers who have operated at senior or staff+ scopeAble to operate effectively in an extremely fast-paced environment and scope and deliver projects end-to-endA track record of designing and developing ML systems or agentic pipelines in productionExperience building evaluation systems and agentic infrastructure (context gathering, tool selection, multi-step planning)Exceptional problem solving fundamentals and ability to learn quickly in a rapidly evolving spaceDeep experience with context engineering: RAG systems, token optimization, context management at scale5+ years of professional industry experienceYou have worked with multi-agent architecturesYou have experience fine-tuning LLMs for specific use casesYou have a pulse on where generative media and agentic AI technology is goingYou are grounded, collaborative, and willing to do whatever it takes to help the team winYou have been a startup founder or an early engineer at one