JoinStacker Recruitment USA

09/04/2026

Hiring! Machine Learning Engineer
Submit your updated CV to
j o b s @ j o i n s t a c k e r . c o m

Role Type: Contractor
Location: Remote

A company is engaging Machine Learning Engineers to contribute expertise to a dynamic customer project. In this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input.

Scope of Work

Design, develop, and refine machine learning models using Python and relevant libraries to address project objectives.
Analyze large datasets and leverage MongoDB to manage and retrieve data efficiently for model training and validation.
Collaborate with cross-functional contributors to identify areas for model improvement and implement robust solutions.
Conduct thorough model evaluation, tuning hyperparameters, and benchmarking results to ensure optimal performance.
Document methodologies, experiments, and outcomes to ensure transparent and repeatable workflows.
Integrate data pipelines and preprocessing workflows to streamline training and inference processes.
Deliver actionable insights and recommendations based on data-driven findings and machine learning outcomes.

Preferred Qualifications

Demonstrated expertise with Python, including deep familiarity with machine learning frameworks such as scikit-learn, TensorFlow, or PyTorch.
Hands-on experience with MongoDB for data manipulation, storage, and retrieval within machine learning projects.
Strong problem-solving skills and a track record of delivering innovative ML solutions in real-world settings.
Understanding of model evaluation metrics, feature engineering, and effective data preprocessing techniques.
Background in deploying or operationalizing machine learning models in cloud or enterprise environments.
Clear written documentation and communication skills for sharing technical findings and best practices.
Ability to adapt quickly to evolving project requirements and contribute collaboratively in a remote setting.

09/03/2026

Hiring: DATA ANALYST
Contractor, Part-Time
$50-60/hr

07/28/2026

Hiring!

Senior Technical Architect
$60 - $130/hr

Required Skills
Cloud benchmark task authoring
Cloud and distributed systems architecture
Production infrastructure ownership

Job Description
Role Title: Technical Architect
Role Type: Contractor
Location: Remote

In this role, you'll apply your platform engineering expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world engineering input. No prior experience in AI is required-your domain knowledge and hands-on production experience are what matter.

As an expert, you will create Reinforcement Learning Environments that test an AI model’s ability to design, deploy, troubleshoot, secure, scale, and recover production-grade cloud infrastructure. You will develop realistic scenarios involving distributed systems, networking, IAM, queues, durable storage, observability, rolling deployments, and disaster recovery, then build reproducible environments, deterministic validation tests, golden reference solutions, and intentionally defective variants.

Responsibilities
Create realistic cloud infrastructure tasks involving distributed systems, networking, security, scalability, and reliability.
Build reproducible, containerized environments with valid reference solutions and intentionally defective variants.
Define measurable requirements across infrastructure configuration, deployed topology, and runtime behavior.
Develop deterministic integration, load, security, failure-injection, deployment, and recovery tests.
Debug environments, document technical decisions, and review tasks created by other experts.

Required Skills and Qualifications
Senior-level technical architecture, cloud infrastructure, platform engineering, DevOps, systems engineering, or SRE experience, including personal ownership of a production platform.
Strong knowledge of distributed systems, scalable APIs, queues, autoscaling, durable storage, and partial-failure scenarios.
Practical experience with IAM, private networking, least-privilege access, and service-to-service security.
Experience with observability, measurable SLOs, rolling deployments, rollback strategies, and disaster recovery.
Ability to write infrastructure automation or testing tools and debug containerized environments using a relevant programming language.

Preferred Qualifications
Experience with Terraform or OpenTofu.
Experience with AWS, Azure, GCP, Kubernetes, or multi-cloud infrastructure.
Experience building internal developer platforms, edge infrastructure, or shared platform services.
Experience with chaos engineering, fault injection, local cloud emulators, or resilience testing.
Experience creating technical evaluations, automated grading systems, or AI environments is helpful but not required.

Process:

Apply to the role, filling out the screening questions
Complete AI interview (aprox. 30 minutes), reviewed by recruiters)
Hiring Manager review

Compensation Structure

Compensation is output-based; experts are paid per task that meets the project specifications. The time required to complete work may vary depending on the expert’s experience and workflow. Minimum submission requirements apply. Experts must submit a minimum of tasks per week.

Start Timeline & Availability

We typically fill roles within 48 hours and are looking for experts ready to jump in right away. If selected, we expect you to start your first tasks within 24–48 hours of completing onboarding.

07/28/2026

Hiring!

Senior Enterprise AI Productivity Specialist
$80 - $150/hr

Required Skills
Enterprise ai productivity
Ai workflow design
Workflow automation
Business process optimization
Cross-platform ai
Ai adoption
Ai enablement
Knowledge management
Enterprise collaboration
System integrations
Process improvement
Change management

Job Description
Role Title: Senior Enterprise AI Productivity Specialist
Role Type: Contractor
Location: Remote

A company is engaging Senior Enterprise AI Productivity Specialists to contribute to an innovative enterprise project, focusing on maximizing business productivity through advanced AI-driven solutions. In this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input. No prior experience in AI is required — your domain knowledge is what matters.

Scope of Work

Design, evaluate, and document enterprise-grade AI-powered workflows that drive measurable productivity improvements.
Develop and optimize workflow automation leveraging leading AI platforms such as ChatGPT Work, Claude Cowork, Codex, or equivalent tools.
Architect cross-platform AI solutions, ensuring workflow portability and interoperability across varied enterprise environments.
Integrate AI systems with enterprise knowledge management, collaboration, and business process platforms.
Enable and support AI adoption initiatives, providing guidance on change management and best practices for enterprise stakeholders.
Identify, analyze, and recommend process improvements using systems thinking and a data-driven approach.
Produce clear documentation, executive presentations, case studies, and business impact reports to communicate AI workflow outcomes and business value.

Preferred Qualifications

5+ years of experience in enterprise environments, with demonstrated experience using generative AI tools to improve business productivity, workflows, and automation.
Proven track record designing and deploying AI-powered workflow automations and integrations across large organizations.
Strong expertise in AI workflow design, business process optimization, and enterprise knowledge management systems.
Familiarity with leading AI productivity platforms (e.g., ChatGPT Work, Claude Cowork, Codex) and enterprise connectors.
Demonstrated ability to drive AI adoption and enablement within cross-functional teams.
Experience in enterprise change management initiatives focused on digital transformation and process improvement.
Excellent systems thinking skills with the ability to deliver clear, actionable insights aligned with organizational objectives.

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07/21/2026

Hiring!
Sales & Marketing - Hybrid, Los Angeles CA

07/21/2026

Hiring!

Senior Platform Engineer

5 openings
$40 - $100/hr

Required Skills
Cloud benchmark task authoring
Cloud and distributed systems architecture
Production infrastructure ownership

Job Description
Role Title: Senior Platform Engineer
Role Type: Contractor
Location: Remote

In this role, you'll apply your cloud infrastructure and platform engineering expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world engineering input. No prior experience in AI is required—your domain knowledge and hands-on production experience are what matter.

As an expert, you will create Reinforcement Learning Environments that test an AI model’s ability to design, deploy, troubleshoot, secure, scale, and recover production-grade cloud infrastructure. You will develop realistic scenarios involving distributed systems, networking, IAM, queues, durable storage, observability, rolling deployments, and disaster recovery, then build reproducible environments, deterministic validation tests, golden reference solutions, and intentionally defective variants.

Responsibilities

Create realistic cloud infrastructure tasks involving distributed systems, networking, security, scalability, and reliability.
Build reproducible, containerized environments with valid reference solutions and intentionally defective variants.
Define measurable requirements across infrastructure configuration, deployed topology, and runtime behavior.
Develop deterministic integration, load, security, failure-injection, deployment, and recovery tests.
Debug environments, document technical decisions, and review tasks created by other experts.

Required Skills and Qualifications

Senior-level cloud infrastructure, platform engineering, DevOps, systems engineering, or SRE experience, including personal ownership of a production platform.
Strong knowledge of distributed systems, scalable APIs, queues, autoscaling, durable storage, and partial-failure scenarios.
Practical experience with IAM, private networking, least-privilege access, and service-to-service security.
Experience with observability, measurable SLOs, rolling deployments, rollback strategies, and disaster recovery.
Ability to write infrastructure automation or testing tools and debug containerized environments using a relevant programming language.

Preferred Qualifications

Experience with Terraform or OpenTofu.
Experience with AWS, Azure, GCP, Kubernetes, or multi-cloud infrastructure.
Experience building internal developer platforms, edge infrastructure, or shared platform services.
Experience with chaos engineering, fault injection, local cloud emulators, or resilience testing.
Experience creating technical evaluations, automated grading systems, or AI environments is helpful but not required.

Process:

Apply to the role, filling out the screening questions
Complete AI interview (aprox. 30 minutes), reviewed by recruiters)
Hiring Manager review

Compensation Structure

Compensation is output-based; experts are paid per task that meets the project specifications. The time required to complete work may vary depending on the expert’s experience and workflow. Minimum submission requirements apply. Experts must submit a minimum of tasks per wee

Start Timeline & Availability

We typically fill roles within 48 hours and are looking for experts ready to jump in right away. If selected, we expect you to start your first tasks within 24–48 hours of completing onboarding.

07/21/2026

Hiring! -- CLOSED --

Graphic Designer

2 openings
$15 - $30/hr

Required Skills
Figma
Ux/ui

Job Description
Role Title: Graphic Designer
Role Type: Contractor
Location: Remote

A company in US is engaging Designers to contribute their UX/UI expertise on a unique AI training project for a customer. In this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input. No prior experience in AI is required — your domain knowledge is what matters. This opportunity is ideal for professionals passionate about leveraging their design skills to impact the development of artificial intelligence tools and systems. Strong written and verbal communication skills are essential, as clear articulation of design decisions and rationales will directly influence the training process.

Preferred Qualifications

Proven expertise in UX/UI design and proficiency with Figma.
Strong portfolio demonstrating impactful digital product design projects.
Experience communicating complex design concepts clearly in both written and verbal formats.
Familiarity with industry best practices in usability, accessibility, and responsive design.
Ability to analyze and critique designs with a critical, constructive mindset.
Capacity to work autonomously and efficiently in a remote, asynchronous setting.
Previous engagement in AI-related projects or familiarity with data annotation processes (a plus, not required).

Process:

Apply to the role, filling out the screening questions
Complete AI interview (aprox. 30 minutes)
Hiring Manager review

Compensation Structure

Compensation is output-based; experts are paid per task that meets the project specifications. The time required to complete work may vary depending on the expert’s experience and workflow. Minimum submission requirements apply. Experts must submit a minimum of tasks per week.

Start Timeline & Availability

We typically fill roles within 48 hours and are looking for experts ready to jump in right away. If selected, we expect you to start your first tasks within 24–48 hours of completing onboarding.

07/13/2026

Hiring!

Frontend Software Engineer
USD 40 - 50/hr

Required Skills
Component style guides
Pixel-perfect ui implementation
Typescript
Responsive web design
Css3

Job Description
Role Title: Frontend Software Engineer
Role Type: Contractor
Location: Remote

A US company is engaging expert Frontend Software Engineers to participate in a high-impact customer project, focusing on crafting exceptional user interfaces. In this role, you'll apply your expertise to help train next-generation AI systems. Your work will shape how models learn, reason, and perform through high-quality, real-world input. No prior experience in AI is required — your domain knowledge is what matters. Leverage your ability to interpret detailed component style guides and screenshots, delivering pixel-accurate, responsive web interfaces that set new standards in usability and aesthetics. Strong communication skills are highly valued for effective collaboration and documentation.

Scope of Work

Interpret and translate component style guides and interface screenshots into precise, visually consistent UI deliverables.
Implement pixel-perfect, responsive web components using modern technologies such as Typescript and CSS3.
Ensure all UI elements adhere to established design systems and accessibility standards.
Collaborate asynchronously through clear documentation and constructive feedback within a remote-first environment.
Proactively identify, communicate, and resolve inconsistencies or ambiguities in design specifications.
Optimize UI performance across devices, focusing on fast load times and smooth interactions.
Contribute domain-specific expertise to guide the training and development of advanced AI models.

Preferred Qualifications

Minimum of 3 years of professional experience delivering high-quality front-end solutions.
Proven proficiency with Typescript, CSS3, and responsive web design principles.
Demonstrated success in building pixel-perfect interfaces from detailed visual references.
Experience working with and extending component style guides and design systems.
Strong English communication skills
Self-motivated and capable of delivering autonomously within distributed project environments.
Advanced degree (Master’s or PhD) in Computer Science or a related technical discipline is a plus.

07/10/2026

Hiring!

Senior Software Engineer
USD 50-70/hr, Remote
Apply at https://h1.nu/1tlkN

Job Summary:
A company is seeking a highly skilled and experienced Senior Software Engineer to join their team. This role involves contributing to innovative projects, potentially in areas like AI training, by applying expertise in software development. The ideal candidate will be proficient in multiple programming languages and possess a deep understanding of software engineering principles, including debugging, feature implementation, refactoring, and performance optimization.

Key Responsibilities:
Develop and implement high-quality code in various programming languages (e.g., Python, Java, Rust, C++, TypeScript).
Analyze, troubleshoot, and resolve complex software defects and performance issues.
Design and implement new features, ensuring scalability and maintainability.
Refactor and optimize existing codebases for improved efficiency and reliability.
Collaborate with cross-functional teams to deliver impactful software solutions.
Document technical decisions, approaches, and code for knowledge sharing and training purposes.
Review and validate code contributions from peers.

Qualifications:
Skills: Proficiency in Python, Java, Rust, C++, TypeScript, Algorithms, Data Structures, Bug Fixing, Feature Implementation, Codebase Refactoring, and Performance Optimization.
Education: Bachelor's or Master's degree in Computer Science, Engineering, or a related field, or equivalent practical experience.
Attributes: Strong problem-solving abilities, excellent communication skills, ability to work independently and as part of a team, attention to detail, a proactive attitude, and a passion for software development.

Benefits:
Competitive compensation based on expertise and output.
Opportunity to work on cutting-edge projects.
Flexible work arrangements, including remote options.
Continuous learning and professional development opportunities.

How to apply:
Interested candidates are encouraged to apply at https://h1.nu/1tlkN

07/10/2026

Hiring!

Client Acquisition Specialist
US Remote, US Market, Commission-based

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