Sign up to access all features of our service.
  • Job search
  • Favorites
  • Create a CV
    New
  • Salaries
  • Subscriptions

Backend Engineer - AI Coding Agent

$85 per hour
London
  • Remote job

About the job

Mercor connects elite creative and technical talent with leading AI research labs. Headquartered in San Francisco, our investors include Benchmark , General Catalyst , Peter Thiel , Adam D'Angelo , Larry Summers , and Jack Dorsey .

Position: Backend Engineer (Coding Agent Experience)

Type: Contract

Compensation: $85/hour

Location: Remote

Role Responsibilities

  • Use frontier AI coding agents to complete and evaluate complex engineering tasks.
  • Review model-generated code for correctness, quality, maintainability, and performance.
  • Identify bugs, edge cases, and failure modes in model outputs.
  • Compare outputs from multiple frontier models and assess their strengths and weaknesses.
  • Apply professional engineering judgment to realistic backend engineering scenarios.
  • Work independently and asynchronously to meet deadlines while improving AI model performance .

Qualifications

Must-Have

  • 2+ years of professional backend engineering experience.
  • Experience building APIs , distributed systems, microservices, backend platforms, or databases.
  • Regular use of AI coding agents such as Cursor, Claude Code, Codex, Windsurf, Gemini CLI, or similar tools.
  • Ability to evaluate model-generated code and identify bugs, edge cases, and architectural tradeoffs.

Preferred

  • Experience working on large-scale production systems.

Compensation & Legal

  • $400 per accepted task .
  • Typical tasks take approximately 1–3 hours after ramp-up.
  • No fixed task limits.
  • Compensation is tied to accepted work.

Application Process (Takes 20–30 mins to complete)

  • Upload resume
  • AI interview based on your resume
  • Submit form

Resources & Support

  • For details about the interview process and platform information, please check:
  • For any help or support, reach out to:

PS: Our team reviews applications daily. Please complete your AI interview and application steps to be considered for this opportunity.

Vacancy posted 29 days ago
Similar jobs that could be interesting for youBased on the Backend Engineer - AI Coding Agent in London vacancy
  • £86k - £115k per annumEstimated
     ...your career so you can shape the future. Senior Full-Stack Engineer - AI Agent Platform London Victoria Office - Hybrid: 4 days in the...  ...features across the entire stack - from React frontends to Python backends to LLM integrations - while mentoring teammates and shaping... 
    Suggested
    Hybrid working
    On-site
    Work from home

    Ebury

    London
    a month ago
  • £69k - £92k per annumEstimated
     ...with our clever automation and AI – that’s the magic of Plum! As...  ...At Plum we’re looking for engineers who are passionate about both...  ...We’re looking for a Senior Backend Enginee r and these are the main...  ...your skills ~120 min. Live Coding Call with our Engineers, including... 
    Suggested
    Long-term contract
    Temporary
    Remote
    Flexible hours
    2 days/week

    Plum Fintech

    London
    7 days ago
  • $100k - $170k per annum

     ...are now expanding the founding engineering team as we scale the product and...  ...We're hiring an ambitious Backend Engineer to work alongside our...  ...includes APIs, background processing, agent orchestration, and data pipelines that support proactive, AI-driven behavior. This is a... 
    Suggested
    On-site
    Remote
    Afternoon shift

    AURORA

    London
    7 days ago
  •  ...Junior Backend Software Engineer. London About Antare Join Antare as we go to market. We’ve been...  ...across our infrastructure and frontend, and AI-assisted tooling to move fast and stay...  ...applications WebSockets Infrastructure as code (AWS CDK, Terraform, etc.) Docker... 
    Suggested

    Antare Technology

    London
    more than 2 months ago
  • £75k - £90k per annum

     ...industries? nPlan has built a unique AI platform that helps some of the largest...  ...role: You will work in a collaborative backend engineering team that owns the systems that power our...  ...this seriously and you would too. Coding agents, LLMs, whatever gets the job done... 
    Suggested
    On-site
    Remote
    Flexible hours

    nPlan

    London
    a month ago
  • £76k - £103k per annumEstimated
     ...sale and rent, find the best agents and secure the latest mortgage...  ...NoSQL stores on AWS. This is a backend role. You will touch the...  ...Requirements (all essential) Senior engineer who has built and operated...  ...craft: maintainable code, code review, pairing when it... 
    Full-time
    Hybrid working
    On-site
    Remote
    Work from home
    Monday to Thursday

    Zoopla

    London
    a month ago
  • £85k - £95k per annum

     ...is the binding constraint on AI and economic prosperity: nothing...  ...what reaches production. Engineers are the fabric. Engineers own...  ...drill. Most of the day-to-day is backend and data engineering, and the...  ...Daily, fluent use of AI coding and agent tools is non-negotiable... 
    Full-time

    SOLR AI

    London
    13 hours ago
  • £135k - £180k per annumEstimated
     ...The challenge is that our backend was built for speed-to-market,...  ...patterns that let a 15-person engineering team ship product confidently...  ...are deeply technical. You write code, review architectures, and debug...  ...we use the latest advances in AI and LLMs to automate document... 
    Long-term contract
    Full-time
    On-site

    herondata

    London
    16 hours ago
  •  ...local services. At Fresha, we believe AI is a force multiplier for feature delivery, not just a coding assistant. We provide every engineer with top-tier tooling (Claude, GitHub Copilot...  ...London EC1V 9NR Your Impact as a Staff Backend Engineer Are you ready to make a... 
    Temporary
    On-site
    Remote

    Fresha

    London
    8 days ago
  • £52k - £75k per annum

     ...exploring how we can leverage AI to deliver an even better experience...  ...customers. Why Join Our Engineering Team? Be part of a team that...  ...a real impact. Here, your code doesn’t just run - it powers the...  ...Engineer, to join our Backend Engineering squad. Our Main... 
    Full-time
    Hybrid working
    On-site
    Work from home
    Monday to Thursday
    1 day/week

    Freetrade

    London
    5 days ago
  • £79k - £101k per annumEstimated
     ...significant impact.   As a Lead Software Engineer at JPMorgan Chase within the International...  ...architectural patterns. Develop secure code so that our customers and ourselves are...  ...Drives team adoption of enterprise-authorized AI-assisted engineering practices within the... 
    Long-term contract

    JPMorgan Chase & Co.

    London
    more than 2 months ago
  • £68k - £91k per annumEstimated
     ...aion Aion is the enterprise AI platform, a full-stack solution...  ...You Are You're a hands-on AI engineer with 3-5+ years of experience building...  ..., build, and deploy intelligent agent solutions. You're equally comfortable writing production code, presenting technical solutions... 
    Full-time
    Flexible hours

    AION

    London
    13 hours ago
  • £59k - £79k per annumEstimated
     ...fastest-growing healthtech companies. Our AI-powered platform, EMMA, is used by...  ...ROLE We are looking for a Full Stack Engineer (Backend Heavy) to join our growing India-based development...  .... Write high-quality, maintainable code and conduct thorough code reviews to uphold... 
    Full-time
    Hybrid working
    Remote
    Flexible hours

    QuantumLoopAI

    London
    7 days ago
  • £77k - £103k per annumEstimated
     ...and commitment.  As a Senior Lead Software Engineer at JPMorganChase within the Accelerator...  ...architectural patterns. Develop secure code so that our customers and ourselves are protected...  ...Drives adoption and governance of approved AI-assisted engineering practices across teams... 
    Long-term contract
    On-site

    JPMorgan Chase & Co.

    London
    more than 2 months ago
  • $85 per hour

     ...Mercor connects elite creative and technical talent with leading AI research labs. Headquartered in San Francisco, our investors...  ..., Larry Summers , and Jack Dorsey . Position: ML Engineer (Coding Agent Experience) Type: Contract Compensation: $85... 
    Remote job
    Summer work

    Mercor

    London
    a month ago
  • $200 per hour

     ...connects specialists with project-based AI opportunities for leading tech companies,...  ...We're building a dataset to evaluate AI coding agents - how well a model handles real-world developer...  ...NOT: Not data labeling Not prompt engineering Not writing code from scratch - the... 
    Permanent
    Temporary
    Part-time
    Freelance

    Mindrift

    London
    13 hours ago
  • £95k - £125k per annumEstimated
    Senior Backend Engineer Do Health - London, Hybrid (3 days/week in person) Why this role exists...  ...data, behaviour-change science and AI personalisation to help people make better...  ...of AI tools in your workflow. Not "vibe coding" - using them as a force multiplier where... 
    Full-time
    Hybrid working

    Voy

    London
    a month ago
  • £72k - £96k per annumEstimated
     ...ensuring high performance and reliability. Champion AI-native development workflows, integrating AI coding agents to improve developer velocity, code quality, and...  ...You communicate clearly, bridging the gap between engineering and non-technical stakeholders to articulate... 
    Extra income
    Full-time
    Hybrid working
    On-site
    Work from home

    Yapily

    London
    13 hours ago
  • £55k - £70k per annum

     ...across unit, integration and end-to-end testing • Drive engineering best practice through code reviews and quality standards • Work within a regulated...  ...principles and data protection requirements • Experience using AI tools to improve development efficiency Senior Full... 
    Permanent
    Full-time
    No agency
    Remote
    Flexible hours

    Pure Human Resources

    London
    27 days ago
  • £55k per annum

     ...Stack Developer to join a groundbreaking AI-powered video technology company revolutionising...  ...a technical leader within the product and engineering team, working directly alongside the CTO,...  ...complex issues whilst maintaining high code quality standards through reviews and... 
    Long-term contract
    Permanent
    Hybrid working
    Visa sponsorship
    On-site
    Remote
    Flexible hours

    The Opportunity Hub UK

    London
    8 days ago
  •  ...highly-skilled cross-functional engineering group on a contract basis....  ...in-app experiences around our AI/ML tooling). This will be a...  ...providing guidance, mentorship, and code reviews without creating...  ...API releases ~237 modelling backend releases ~4+ years experience... 

    runna

    London
    16 hours ago
  • £55k - £73k per annumEstimated
     ...looking for a Senior Full Stack Engineer to help shape and scale our...  ...leading hand in both frontend and backend systems delivering high quality...  ...While your primary focus will be coding and architecture, you'll also...  ...Company Bonus Scheme Paid for AI Subscription (Claude / ChatGPT... 
    Full-time
    Hybrid working
    On-site

    quantum

    London
    16 hours ago
  • £69k - £90k per annumEstimated
     ...face of the global beauty industry by de-coding makeup applications for everyone, everywhere...  ...for motivated, curious, and collaborative engineers who are excited to build game-changing...  ...handling and page rendering.  ~ Using AI tools and practices to enhance product features... 
    Full-time
    Fixed-term contract
    Hybrid working

    Charlotte Tilbury

    London
    19 days ago
  • £75k per annum

     ...environment. Your new role: As a Full Stack Engineer at Doctor Care Anywhere, you will design...  ...end and bring a track record of using AI across the software development...  ...Write clean, well-tested, maintainable code across backend and frontend, and hold a high bar in code... 
    Full-time
    Hybrid working
    On-site
    Work from home

    Doctor Care Anywhere

    London
    21 days ago
  • £55k - £73k per annumEstimated
     .... We're small enough that your code ships fast and your decisions matter...  ...re hiring a mid-level back-end engineer who likes owning real problems...  ..., and launch. You already use AI as part of how you think, build...  ..., build and modernize the backend services the platform runs on,... 
    Full-time

    XE.com

    London
    6 days ago
  • £60k - £80k per annum

     ...automate and strengthen their financial controls. Our AI solutions redefine how Accounts Payable teams operate...  ...challenging programming role. Tasks could include writing code to manage incoming data, working with AI Engineers to analyse huge data sets, or writing Restful APIs in... 
    Full-time
    Hybrid working
    On-site
    Monday to Friday

    Xelix

    London
    6 days ago
  • £44k - £59k per annumEstimated
     ...in a global team where clear and concise communication skills are a must. Work independently following proper coding standards. ~ Exposure to leveraging AI agents and automation tools across software development, validation, and production deployment. ~ At least 6 years'... 
    Full-time

    Methods Business and Digital Technology

    London
    7 days ago
  • £70k - £85k per annum

     ...customer growth. At Hook, we use AI and Machine Learning to help...  ...will wear many hats in your engineering duties. Your day-to-day will include...  ...writing clean, well-tested code Own significant parts of...  ...working on both frontend and backend development. We use React on the... 
    On-site
    Work from home
    Flexible hours
    3 days/week

    hook

    London
    16 hours ago
  • £65k - £85k per annumEstimated
     ...experience in both modern web technologies and backend technologies, a talent for business...  ...fixes where required Collaborate through code reviews, design discussions, and knowledge...  ...want to use ~ Comfortable using agentic AI coding tools such as Claude Code and are genuinely... 

    Winton

    London
    a month ago
  • £130k - £174k per annumEstimated
     .... As a Senior Lead Software Engineer at JPMorgan Chase within J.P. Morgan...  ...be a highly skilled hands-on Backend Engineer for the Platform team...  ...of engineering best practices, coding standards, and architectural...  ...adoption and governance of approved AI-assisted engineering practices... 
    Long-term contract

    JPMorgan Chase & Co.

    London
    2 days ago

Do you want to receive more vacancies?

Subscribe and receive similar vacancies to Backend Engineer - AI Coding Agent. Be the first to apply!