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

Backend Engineer - Remote

YO AI Labs

Toronto, ON
  • Remote job

Senior Software Engineer

Job Type: Contractor (~15 hours/week)
Location: Remote

Job Summary

We are seeking experienced Senior Software Engineers to support an AI training project by creating reinforcement learning environments that evaluate AI models on complex software engineering tasks using Model Context Protocol (MCP) tools.

You will design reproducible environments, deterministic verification, and reference solutions for tasks such as bug fixing, feature implementation, codebase refactoring, and performance optimization . No prior AI experience is required.

Key Responsibilities

  • Create reinforcement learning environments for software engineering tasks.
  • Design tasks involving bug fixing, feature development, refactoring, and performance optimization .
  • Build deterministic verification systems and golden reference solutions.
  • Evaluate AI agents' ability to reason through complex codebases and use MCP tools effectively.
  • Develop realistic, reproducible software engineering scenarios.
  • Ensure tasks accurately measure coding ability, problem-solving, and tool usage.
  • Document solutions and provide clear technical feedback.

Required Skills

  • Strong proficiency in Python 3, Java, Rust, C++, or TypeScript .
  • Strong understanding of algorithms and data structures .
  • Experience with bug fixing and debugging complex software issues .
  • Proven experience in feature implementation and codebase refactoring .
  • Strong knowledge of performance optimization and tuning .
  • Excellent written and verbal communication.
  • Strong attention to detail.

Preferred Qualifications

  • Experience working with large-scale or distributed codebases .
  • Familiarity with AI/ML systems is a plus but not required.
  • Experience with rigorous code reviews and software engineering best practices .
  • Experience working effectively in remote or cross-functional teams.

Hiring Process

  1. Submit an application and screening questions.
  2. Complete an AI interview (~30 minutes).
  3. Complete a technical assessment, if required.
  4. Hiring Manager review.

Compensation

Compensation is output-based , with payment provided per task that meets project specifications. Minimum weekly submission requirements may apply.

Availability

Selected experts should be prepared to begin their first tasks within 24–48 hours of completing onboarding .

Vacancy posted 26 days ago
Similar jobs that could be interesting for youBased on the Backend Engineer - Remote in Toronto, ON vacancy
  • $55 - $65 per hour

     ...Contract Compensation: $55–$65/hour Location: Remote Role Responsibilities Utilize PyCharm on macOS...  ...to meet project requirements. Collaborate with backend engineers and data practitioners to optimize workflows. Qualifications... 
    Remote work
    Full time
    Contract work
    Summer work

    Mercor

    Toronto, ON
    12 hours ago
  • $100k - $120k per year

     ...tackling bold challenges, join us! We are a close-knit group of engineers of different stripes - developers, designers, and product owners...  ...work, while balancing your personal and life needs. Offering remote work flexibility, along with the opportunity to interact and collaborate... 
    Remote work
    Full time
    Casual work
    Manual labor
    Work at office
    Work from home
    Flexible hours
    3 days per week

    Hellofresh

    Toronto, ON
    12 hours ago
  • $105k - $125k per year

     ...General Information: Job Title: Backend Engineer III Location: Toronto (Onsite/ Hybrid...  ...models Experience building workflow engines, pipelines, or DAG-based processing Familiarity...  ...Flexibility to Thrive We support remote and hybrid work models by offering... 
    Remote work
    Long term contract
    Full time
    Internship
    Work at office
    Local area
    Immediate start
    Flexible hours

    Fulfillment IQ

    Toronto, ON
    12 hours ago
  • $85 per hour

     ..., 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... 
    Remote work
    Full time
    Contract work
    Summer work

    Mercor

    Toronto, ON
    12 hours ago
  •  ...About this role Employment Type: Full-time Location: Remote within Canada, or Hybrid in our Downtown Toronto office (3 days...  ...Standard Time The Opportunity We are looking for a Staff Backend Engineer who wants to build and own the next generation of Bettermode... 
    Remote work
    Full time
    Manual labor
    Work at office
    Worldwide
    Flexible hours
    3 days per week

    Engage, Support

    Toronto, ON
    12 hours ago
  • $50 - $70 per hour

     ...FinTechs in Canada. About the Role We’re looking for a Backend Engineering Co-op to join us for an 8-month term. You’ll work closely...  ...lunch if you come in on Tuesdays and Fridays. ~ We'll be fully remote in January and most of February, move to 1 day in-office... 
    Remote work
    Full time
    Temporary work
    Internship
    Work at office

    Bree

    Toronto, ON
    12 hours ago
  • $110k - $130k per year

     ...chapter with us! You will be joining the Backend Services team. You'll get the opportunity...  .... If you have a passion for high-impact engineering, this is the place to be! You will be...  ...while having a great time. Wattpad is a remote friendly company and encourages remote... 
    Remote work
    Full time
    Local area

    Webtoon Entertainment Inc. (Wattpad & Webtoon Family Of Bran...

    Toronto, ON
    12 hours ago
  •  ...the systems that power our product — from document processing pipelines to real-time workflow execution. We’re hiring a Senior Backend Engineer to help build and scale the core infrastructure behind our document intelligence and workflow platform. This role is ideal for... 
    Work at office

    Feathery

    Toronto, ON
    12 hours ago
  • $150k - $160k per year

     ...join us! We are a close-knit group of engineers of different stripes - developers, designers...  ...Lead the design and delivery of scalable backend platforms and distributed systems,...  ...balancing your personal and life needs. Offering remote work flexibility, along with the... 
    Remote work
    Full time
    Work at office
    Work from home
    Flexible hours
    2 days per week
    3 days per week

    Hellofresh

    Toronto, ON
    12 hours ago
  • $160k - $220k per year

     ...needed. It is the security layer between people (and non-human-identities) and the systems they need to do their jobs. The Staff Backend Engineer Opportunity We're looking for a Backend Software Engineer who wants to work on hard problems: distributed systems and building... 
    Full time
    Local area
    Worldwide

    Okta

    Toronto, ON
    12 hours ago
  • $90k - $110k per year

     ...The Intermediate Backend Developer works closely with engineering teams to design, implement, and maintain components of the Smile Digital Health platform. This position operates with a good degree of independence, contributing across the full development lifecycle from requirements... 
    Remote job
    Full time
    Internship

    Smile Digital Health

    Toronto, ON
    12 hours ago
  •  ...our patients convenient access to reasonably-priced medications without ever needing to step foot in a pharmacy. As a Senior Backend Engineer , you will have a hand in architecting the technology and customer experience that are pivotal to multiple web products for patients... 
    Full time
    Live out

    Nimblerx

    Toronto, ON
    12 hours ago
  • About Covers and Legend Here at Covers, we're a top digital media company in the sports betting industry, with a clear sense of purpose and a belief that success comes from the strength of our team and our culture.  We're proudly part of Legend. At Legend, we're building...
    Full time

    #legend

    Toronto, ON
    12 hours ago
  •  ...into operational reality, solving some of the hardest systems-level problems in industry. Role Overview We're looking for Backend AI Engineers to design, build, and own the core AI infrastructure and services that power Nexxa's products in production. Where our Forward... 
    Long term contract
    Full time

    Nexxa.ai

    Toronto, ON
    12 hours ago
  • $160k - $220k per year

     ..., flexibly, and collaboratively — without compromising standards — we want to hear from you. We're looking for an exceptional backend engineer and hands-on architect to help us scale and connect millions of devices to wireless networks. The projects and potential impact are... 
    Full time
    Worldwide
    Flexible hours

    Us Mobile

    Toronto, ON
    12 hours ago
  •  ...investigations and back-office execution.   We are hiring a Senior backend engineer to  build and productionize agentic systems that are safe,...  ...with at least one of: agent orchestration, workflow engines, tool-calling systems, or evaluation frameworks for LLM/agent... 
    Hourly pay
    Permanent employment
    Full time
    Work at office

    Eq Bank

    Toronto, ON
    12 hours ago
  • $40 - $50 per hour

     ...Jack Dorsey . Position: Software Engineer Type: Contract Compensation: $40–$50/hour Location: Remote Role Responsibilities Build MCP...  ...Python skills. Experience with APIs , backend systems, and debugging. Familiarity... 
    Remote work
    Full time
    Contract work
    Summer work
    Local area

    Mercor

    Toronto, ON
    12 hours ago
  •  ...reach this milestone. We are looking for an experienced Backend Software Engineer to join our team and help us revolutionize the way people move...  ...employee performance, and management discretion. #LI-Remote #LI-PP1 Why Lime?  When you join Lime, you join a global... 
    Remote work
    Full time
    Flexible hours

    Lime

    Toronto, ON
    12 hours ago
  • $156k - $214.5k per year

     ...in community, come join ours. About this role: Our Brand engineering team owns the code that our Brands use to manage their business...  ...Additionally, hybrid in-office roles will have the flexibility to work remotely up to 4 weeks per year. Specific Workplace and Information... 
    Remote work
    Full time
    Work at office
    Local area
    Monday to friday
    3 days per week

    Faire

    Toronto, ON
    12 hours ago
  • $180k - $210k per year

     ...About Us We’re looking for a Staff Engineer -  User Experience (Backend) to join our Patient Platform team and shape the systems that power patient...  ...design reviews, and technical leadership. This is a fully remote role, open to candidates based in Ontario, with... 
    Remote work
    Full time
    Contract work
    Internship
    Local area
    Immediate start
    Flexible hours

    Prenuvo, Inc.

    Toronto, ON
    12 hours ago
  • $120k - $150k per year

     ...efficiency. The role will work closely with engineering, product, culinary, editorial, and...  ...for a Senior Software Engineer with strong backend experience, a talent for turning complex...  ...balancing your personal and life needs. Offering remote work flexibility, along with the... 
    Remote work
    Full time
    Casual work
    Manual labor
    Work at office
    Work from home
    Flexible hours
    2 days per week
    3 days per week

    Hellofresh

    Toronto, ON
    12 hours ago
  •  ...matching process can be found here .  What you’ll do As an engineer on the team, you’ll be responsible for shaping and building a...  .... Minimum requirements ~2-12+ years of experience in backend software development ~ Ability to write high quality code (in... 
    Full time
    Contract work
    Internship

    Stripe, Inc.

    Toronto, ON
    12 hours ago
  • $156k - $214.5k per year

     .... We are looking for a Senior Growth Engineer (Frontend or Backend) who thrives at the intersection of product...  ...and experiments into scalable growth engines. What you’ll do: Own and...  ...roles will have the flexibility to work remotely up to 4 weeks per year. Specific Workplace... 
    Remote work
    Full time
    Work at office
    Local area
    Monday to friday
    3 days per week

    Faire

    Toronto, ON
    12 hours ago
  •  ...latest AI tools and make thoughtful decisions with data-driven insights – technology plays an invaluable role in our success. The engineering team at Warner Music Group makes all of it a reality.  What You'll Do: - Reimagine and implement the future of tech for the music... 
    Full time
    Local area
    Worldwide

    Warner Music Inc.

    Toronto, ON
    12 hours ago
  • $118k - $152k per year

     ...business impact. The Role We're looking for a Staff Java Engineer who combines deep technical expertise with a passion for engineering...  ...and engineering teams to design and deliver resilient, scalable backend solutions using modern Java technologies, cloud platforms, and... 
    Long term contract
    Full time
    Internship
    Immediate start

    Capco

    Toronto, ON
    12 hours ago
  •  ...investment banks, wealth managers, hedge funds, and regulators globally. About the Role We are looking for a Senior Software Engineer, Backend to join our engineering team and contribute to a large, complex production platform used by sophisticated financial services... 
    Long term contract
    Full time
    Flexible hours

    d1g1t

    Toronto, ON
    12 hours ago
  • $185k - $231.5k per year

     ...DoorDash is building the world's most reliable on-demand, logistics engine for delivery! We're looking for experienced engineers to join our...  ...problems with elegant technical solutions. You'll operate our backend services and architecture that support all product functionality... 
    Full time
    Local area

    Doordash

    Toronto, ON
    12 hours ago
  • $140k - $180k per year

     ...Responsibilities: Design, build, and maintain scalable backend systems that power our measurement, attribution, and reporting...  ...reliability, scalability, and performance at scale Champion engineering best practices around code quality, testing, observability, and... 
    Full time

    Movable Ink

    Toronto, ON
    12 hours ago
  • $120k - $150k per year

     ...world's most reliable on-demand, logistics engine for delivery. We are continuing to grow...  ...Engineering offices globally! We are looking for Backend Engineers to build and maintain a large...  ...to Applicants for Jobs Located in NYC or Remote Jobs Associated With Office in NYC Only... 

    Doordash Canada

    Toronto, ON
    12 hours ago
  • $190.5k - $262k per year

     ...Product, Design, Data Science, and other engineering teams to deliver cohesive, high-impact solutions...  ...available, high-performance, low-latency backend systems at scale. ~ AI-native, using...  ...roles will have the flexibility to work remotely up to 4 weeks per year. Specific... 
    Remote work
    Full time
    Work at office
    Local area
    Monday to friday
    3 days per week

    Faire

    Toronto, ON
    12 hours ago

Do you want to receive more vacancies?

Subscribe and receive similar vacancies to Backend Engineer - Remote. Be the first to apply!