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Duolingo

Unity Engineer, Music (Contractor)

Master new languages through bite-sized, gamified lessons tailored to your pace using AI-driven personalization for students, travelers, and lifelong learners.

engineeringremoteLondon, GBcontract

Benefits:

  • Meaningful work

  • Limitless learning opportunities

  • Collaboration with world-class minds

Experience Requirements:

  • Strong experience with Unity development (C#), specifically for mobile platforms (iOS/Android)

  • Background in the gaming industry with a portfolio demonstrating high-quality game feel and polish

  • Sharp UX instincts and experience implementing complex UI/UX designs

  • Experience working effectively with multi-functional team members

Other Requirements:

  • Strong interest in Duolingo and our mission

  • Experience embedding Unity as a library (UaaL) into native mobile applications

  • Background in music, music theory, or audio programming

  • Experience in web/mobile localization workflows and tools

Responsibilities:

  • Implement the new music course within the Duolingo app using embedded Unity

  • Productionize the existing prototype, turning it into robust, release-ready code

  • Work embedded within the Duolingo app architecture to ensure seamless integration of Unity

  • Collaborate with designers and product partners to refine the look and feel

  • Engage in rapid prototyping to test new music mechanics and interaction models

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Meshy

AI Infrastructure Engineer

Transform text and images into production-ready 3D models in minutes with AI-powered texturing, rigging, and animation for game development and 3D printing.

engineeringhybridSunnyvale, USfull-time

Benefits:

  • Stock options

  • 401(k) plan

  • Health insurance

  • Dental insurance

  • Vision insurance

Experience Requirements:

  • Linux fundamentals

  • Networking fundamentals

  • Experience with Kubernetes

  • Experience with incident response

  • Strong software engineering ability in Go or Python

Other Requirements:

  • Experience with observability tools

  • Ability to reason about performance tradeoffs

Responsibilities:

  • Own production reliability (availability, latency, incident response)

  • Build and maintain observability (metrics, logs, traces)

  • Improve deployment safety (CI/CD, rollout strategies)

  • Capacity planning and cost control

  • Security and compliance (secrets management, patching)

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Meshy

AI Product Engineer (3D Full Stack)

Transform text and images into production-ready 3D models in minutes with AI-powered texturing, rigging, and animation for game development and 3D printing.

engineeringhybridBeijing, CNfull-time

Benefits:

  • Competitive salary, equity, and benefits package

  • Flexible work environment

  • Opportunities for fast professional growth

  • Inclusive culture

  • Unlimited, flexible time off

Education Requirements:

  • Bachelor’s degree or above in Computer Science or a related field

Experience Requirements:

  • 3+ years of experience in graphics-focused frontend development

  • Strong understanding of computer graphics fundamentals

  • Proficiency in WebGL or popular Web 3D rendering frameworks

  • Proficiency in TypeScript

  • Familiarity with modern frontend frameworks such as React

Other Requirements:

  • Excellent communication skills and aesthetic judgment

  • Experience developing web-based editors is a plus

Responsibilities:

  • Develop next-generation spatial intelligence creation tools

  • Design and implement generative AI–driven 3D creative workflows

  • Optimize the interactive 3D experience on Meshy’s web platform

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Meshy

Backend Engineer

Transform text and images into production-ready 3D models in minutes with AI-powered texturing, rigging, and animation for game development and 3D printing.

engineeringhybridShanghai, CNfull-time

Benefits:

  • Brain (intellectual pursuit)

  • Heart (empathy and passion)

  • Gut (innovation and risk-taking)

  • Taste (quality and aesthetics)

Experience Requirements:

  • 3+ years of backend development experience

  • Experience with SQL databases (MySQL, PostgreSQL, etc.)

  • Expertise in Golang, TypeScript, Python, or Java

  • Experience with distributed systems, REST APIs, and microservices

  • Proficient in common data structures and algorithms

Other Requirements:

  • Excellent written and verbal communication skills

  • Quick learner for new technologies

Responsibilities:

  • Collaborate with cross-functional teams for feature delivery

  • Conduct detailed design, coding, and unit testing

  • Participate in code reviews and share best practices

  • Develop and maintain distributed programs on Kubernetes

  • Support and debug production issues via on-call rotations

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Meshy

Data Artist

Transform text and images into production-ready 3D models in minutes with AI-powered texturing, rigging, and animation for game development and 3D printing.

engineeringhybridBeijing, CNfull-time

Benefits:

  • Competitive salary, equity, and benefits package

  • Flexible work environment

  • Opportunities for professional growth

  • Inclusive culture

  • Unlimited, flexible time off

Education Requirements:

  • Bachelor’s degree or higher in Fine Arts, Animation, Game Design, or related fields

Experience Requirements:

  • Familiarity with fundamental 3D production pipeline (PBR)

  • Proficiency in Blender, 3ds Max, Maya, or Substance Painter

  • 1–3 years of experience in 3D-related industries

Other Requirements:

  • Capable of balancing aesthetic quality with technical constraints

Responsibilities:

  • Define 3D art specifications and benchmark standards for AI

  • Optimize artistic pipeline for 3D data cleaning and QA

  • Monitor quality of models delivered by outsourcing vendors

  • Research emerging trends in 3D Generative AI

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Meshy

Frontend Engineer

Transform text and images into production-ready 3D models in minutes with AI-powered texturing, rigging, and animation for game development and 3D printing.

engineeringhybridBeijing, CNfull-time

Benefits:

  • Brain (intelligence value)

  • Heart (caring and passion)

  • Gut (risk-taking)

  • Taste (quality aesthetics)

Experience Requirements:

  • At least 3 years of frontend development experience

  • Solid proficiency in HTML/CSS/JavaScript and React tech stack

Other Requirements:

  • Sharp sense of detail and aesthetics

  • Sensitivity to data and metrics

  • Ability to read technical documents in Chinese and English

Responsibilities:

  • Participate in requirement reviews and collaborate on solutions

  • Build maintainable pages and components using React/Next.js

  • Provide frontend support for growth experiments and core products

  • Implement and maintain experience metrics (performance, SEO)

  • Turn ideas into MVPs and iterate based on data

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Meshy

Junior Research Infrastructure Engineer

Transform text and images into production-ready 3D models in minutes with AI-powered texturing, rigging, and animation for game development and 3D printing.

engineeringhybridSunnyvale, USfull-time

Benefits:

  • Stock options for core team members

  • 401(k) plan

  • Comprehensive health, dental, and vision insurance

  • Latest office equipment

  • Unlimited, flexible time off

Experience Requirements:

  • 2+ years of experience in software engineering or distributed systems

  • Strong programming skills in Python

  • Familiarity with distributed frameworks (Spark, Dask, Ray)

  • Experience with workflow orchestration tools (Temporal, Celery)

  • Proficiency with Infrastructure as Code (Terraform)

Other Requirements:

  • Product-first mindset for internal tooling

  • Comfortable in a startup environment

Responsibilities:

  • Design and implement distributed task orchestration systems

  • Architect pipelines across cloud object storage and data lakes

  • Design and maintain distributed ingestion pipelines

  • Support preprocessing of unstructured assets for AI training

  • Build internal Data Explorers and management consoles

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Meshy

QA Engineer

Transform text and images into production-ready 3D models in minutes with AI-powered texturing, rigging, and animation for game development and 3D printing.

engineeringhybridBeijing, CNfull-time

Benefits:

  • Brain (intellectual pursuit)

  • Heart (caring team)

  • Gut (bold risks)

  • Taste (high quality)

Education Requirements:

  • Bachelor’s degree or above, Computer Science or related majors preferred

Experience Requirements:

  • Experience in testing Web or Mobile projects

  • Familiarity with testing workflows for AI, gaming, or productivity tools

  • Ability to perform issue localization through packet sniffing

  • Proficiency in basic SQL statements (CRUD)

Other Requirements:

  • Experience with Jira or Linear

  • Knowledge of MySQL

Responsibilities:

  • Develop test plans, design test cases, and execute tests

  • Conduct comprehensive testing of functionality and performance

  • Perform user experience testing and suggest improvements

  • Communicate with development team to resolve defects

  • Participate in product requirement and design reviews

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Meshy

QA Engineer-Mobile

Transform text and images into production-ready 3D models in minutes with AI-powered texturing, rigging, and animation for game development and 3D printing.

engineeringhybridBeijing, CNfull-time

Benefits:

  • Brain (intellectual value)

  • Heart (team empathy)

  • Gut (innovation)

  • Taste (aesthetics)

Education Requirements:

  • Bachelor’s degree or above, preferably in Computer Science

Experience Requirements:

  • Experience in mobile testing (server-side and client-side)

  • Familiarity with testing workflows for AI or gaming tools

  • Proficiency in testing tools and methodologies

  • Ability to perform issue localization (packet sniffing, log analysis)

  • Familiarity with relational databases such as MySQL

Other Requirements:

  • Excellent communication skills and team spirit

Responsibilities:

  • Develop test plans and design test cases for 3D AI products

  • Conduct comprehensive testing on functionality and stability

  • Test user experience and optimize user journey

  • Communicate with development to assist in defect resolution

  • Participate in design reviews and risk assessments

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Meshy

Recommendation System Engineer

Transform text and images into production-ready 3D models in minutes with AI-powered texturing, rigging, and animation for game development and 3D printing.

engineeringhybridShanghai, CNfull-time

Benefits:

  • Brain (intellectual pursuit)

  • Heart (empathy)

  • Gut (courage)

  • Taste (beauty)

Experience Requirements:

  • 3+ years of professional experience in machine learning or recommendations

  • Strong coding skills in Python, Java, or Scala

  • Understanding of ranking, collaborative filtering, and personalization

  • Experience with data processing frameworks (Spark, Flink)

Other Requirements:

  • Strong problem-solving and communication skills

Responsibilities:

  • Design and optimize recommendation and ranking algorithms

  • Analyze user behavior data to improve personalization

  • Evaluate and experiment with new ML methods

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HeyGen

AI Research Engineering Intern

Create professional AI videos with lifelike avatars and natural voiceovers in minutes. Ideal for marketers and teams looking to scale content in 175+ languages.

engineeringonsiteLos Angeles, USinternship

Benefits:

  • Hands-on experience in applied AI research

  • Mentorship from top experts in AI and generative modeling

  • Real-world impact through contributions to widely-used products

  • A fast-paced, collaborative environment at the forefront of innovation

  • Potential pathway to a full-time role based on performance

Education Requirements:

  • Enrolled in or recently graduated from a Master’s or Ph.D. program in Computer Science, AI, or a related field

Experience Requirements:

  • Hands-on experience with deep learning and generative models (GANs, diffusion, transformers, etc.) applied to video or image generation

  • Demonstrated research excellence, including top-tier publications (e.g., CVPR, ICLR, NeurIPS, ICML)

Other Requirements:

  • Commitment to working 5 days/week in the office (onsite)

Responsibilities:

  • Research and prototype state-of-the-art generative models for video and avatar generation

  • Design and implement algorithms for real-time video generation and multimodal interactions

  • Collaborate with cross-functional teams to integrate research into HeyGen’s core platform

  • Stay up-to-date with the latest advancements in machine learning, computer vision, and generative AI

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swsh

Design Engineer

Organize and discover event photos instantly using AI facial recognition to find shots of yourself and friends across shared group albums in seconds.

engineeringhybridNew York, US
$120,000 - $160,000
full-time

Benefits:

  • Commuter benefits

  • Health/wellness stipend

  • Daily lunch stipend

  • PTO

  • Team off-sites

Experience Requirements:

  • Strong proficiency in building frontends using React

  • Strong proficiency in building mobile applications using Expo and React Native

  • Strong proficiency in building web applications using Next.js

  • Familiarity with GraphQL APIs

  • Experience with rigorous end-to-end web testing using Playwright

Other Requirements:

  • Self-motivated with the ability to take ownership of projects and drive them to completion

  • Strong problem-solving and debugging skills with a keen attention to detail

  • Include the word "strawberry" in your application if you're not an LLM

Responsibilities:

  • Design and build consumer and B2B features

  • Contribute to building our mobile and web application using Expo and React Native

  • Collaborate closely with product to balance requirements and ship delightful features

  • Contribute to code reviews and provide feedback

  • Polish the UI with a strong attention to detail

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Worthify.ai

Senior Machine Learning Engineer – Agentic AI Systems (TS/SCI)

Automate reverse engineering and binary analysis using AI-powered static and dynamic tools with Model Context Protocol integration for existing security agents.

engineeringhybridChantilly, US
$180,000 - $220,000
full-time

Experience Requirements:

  • 4+ years building ML solutions at scale

  • Strong Python; deep experience with PyTorch/TensorFlow

  • Hands-on distributed systems experience (Ray highly valued)

  • Understanding of LLM orchestration, memory, retrieval, and planning

  • Experience with MLOps/model versioning and experiment tracking (e.g., MLflow, DVC, Weights & Biases)

Other Requirements:

  • Active TS/SCI clearance

  • Builder's mindset

  • Experience working with cyber/network telemetry or security datasets is a plus

  • Familiarity with model security/adversarial ML

  • Ability to identify and mitigate vulnerabilities

Responsibilities:

  • Architect, train, and deploy AI systems for reasoning, planning, and multi‑step decision‑making

  • Build and scale distributed training/inference pipelines using Ray and modern cloud infrastructure

  • Integrate agentic AI into operational environments across cross‑functional teams

  • Prototype techniques from memory‑augmented models to tool‑use orchestration

  • Develop ML models on cyber data to support object detection, data triage, search/optimization, inference, behavior detection, and automated discovery and decision making

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Worthify.ai

Machine Learning & Reverse Engineering Intern

Automate reverse engineering and binary analysis using AI-powered static and dynamic tools with Model Context Protocol integration for existing security agents.

engineeringremoteUS
$25/hour
internship

Benefits:

  • Mentorship

Experience Requirements:

  • Experience with Python and interest in ML and/or RE

  • 0+ years (up to 2)

Other Requirements:

  • Desire to learn, experiment, and solve problems

  • Collaborative mindset

  • Curiosity about how systems work

Responsibilities:

  • Assist with development, training, and deployment of ML models

  • Support RE projects from code analysis to automation

  • Prototype tools that bridge AI and system analysis

  • Learn from engineers working at the cutting edge of AI and cybersecurity

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Cosine

Devops Engineer

Accelerate enterprise development with an on-premise AI coding agent that handles complex refactors, bug fixes, and feature requests in air-gapped environments.

engineeringonsiteLondon, GB
£60,000 - £90,000
full-time

Benefits:

  • Equity / share options

  • 30 days’ holiday + bank holidays

  • Daily lunch provided

  • Monthly team breakfasts

  • Pension

Experience Requirements:

  • 5+ years building and operating production infrastructure on a major cloud

  • Significant hands-on experience running Kubernetes in production

  • Deep experience with IaC tools (Pulumi, Terraform, CDK)

  • Owned the uptime and performance of user-facing systems

  • Strong scripting and programming skills

Other Requirements:

  • Startup mindset

  • Bias toward pragmatic solutions

  • Clear communication and collaboration skills

Responsibilities:

  • Own core infrastructure (Kubernetes, cloud resources)

  • Build the deployment & tooling layer (CI/CD, IaC)

  • Own reliability & operations (SLOs/SLIs, observability, on-call)

  • Shape networking & security (VPCs, IAM, service meshes)

  • Partner with product & research teams

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Cosine

Machine Learning Engineer – Lumen Enterprise Models (SWE-focused LLMs)

Accelerate enterprise development with an on-premise AI coding agent that handles complex refactors, bug fixes, and feature requests in air-gapped environments.

engineeringonsiteLondon, GB
£80,000 - £110,000
full-time

Benefits:

  • Equity / share options

  • 30 days’ holiday + bank holidays

  • Daily lunch provided

  • Monthly socials

  • Pension

Experience Requirements:

  • 3–5+ years working as an ML engineer / applied scientist

  • Deep proficiency with PyTorch and its distributed primitives

  • Experience training models at ≥70B parameters

  • Experience with SFT and RL on top of LLMs

  • Strong software engineering background

Other Requirements:

  • Distributed systems / training ops experience

  • Data engineering instincts

  • Clear communication and ownership

Responsibilities:

  • Turn open-source base models into high-performance SWE agents

  • Design and run large-scale training experiments

  • Build and iterate on large-scale RL loops

  • Operate large multi-node training jobs

  • Improve evaluation for SWE models

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Cosine

Product Engineer

Accelerate enterprise development with an on-premise AI coding agent that handles complex refactors, bug fixes, and feature requests in air-gapped environments.

engineeringonsiteLondon, GB
£80,000 - £120,000
full-time

Benefits:

  • Equity / share options

  • 30 days’ holiday + bank holidays

  • Daily lunch provided

  • Monthly team breakfasts

  • Pension

Experience Requirements:

  • 5+ years of experience building production-grade software

  • Experience building reactive, highly interactive applications (React, Svelte, Vue)

  • Experience designing and consuming REST APIs

  • Experience working with developer tooling

  • Strong experience with TypeScript

Other Requirements:

  • Comfortable iterating quickly

  • Ability to operate in a fast-moving environment

  • Care deeply about developer experience

Responsibilities:

  • Build end-user products (editor extensions and web applications)

  • Enable developers to use advanced language models

  • Collaborate closely with research to validate new experiences

  • Translate emerging model capabilities into features

  • Maintain high bar for performance and reliability

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Cosine

Software Engineer, Cloud Infrastructure at Cosine

Accelerate enterprise development with an on-premise AI coding agent that handles complex refactors, bug fixes, and feature requests in air-gapped environments.

engineeringonsiteLondon, GB
£60,000 - £90,000
full-time

Benefits:

  • Equity / share options

  • 30 days’ holiday + bank holidays

  • Daily lunch provided

  • Monthly socials

  • High-quality equipment

Experience Requirements:

  • 5+ years of experience developing or operating core infrastructure

  • Experience running large-scale orchestration systems such as Kubernetes

  • Experience building abstractions and tooling on major cloud platforms

Other Requirements:

  • Comfortable working in a fast-moving environment

  • Values rigorous thinking and open communication

Responsibilities:

  • Design and build development and production platforms

  • Ensure infrastructure can scale to next order of magnitude

  • Contribute to a culture of diversity and open communication

  • Participate in the on-call rotation

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MyArchitectAI

AI Developer

Produce photorealistic architectural renders in 10 seconds via browser. Help designers iterate concepts faster without needing expensive graphics hardware.

engineeringremotepart-time

Education Requirements:

  • No education or certificates needed

Experience Requirements:

  • Passionate about image generation in ComfyUI

  • Experience training custom models

  • Can work independently

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Fliplet

Frontend & AI Software Developer

Deliver AI-powered mobile and web applications in minutes using a drag-and-drop builder and specialized templates for enterprise and professional services.

engineeringremotefull-time

Benefits:

  • Online social events

  • Monthly company update call

  • Performance & reliability day

  • Annual offsites

Experience Requirements:

  • 5+ years Advanced JavaScript, HTML/CSS/SCSS, and jQuery skills

  • 4+ years Vue JS

  • 2+ years Node JS development

  • 2+ years Task planning and estimates

  • Experience with GitHub in a business environment

Other Requirements:

  • Advanced experience with JS SDKs and REST APIs

  • Experience working with chained promises in JavaScript

  • Experience managing tickets with Jira

  • Experience with Claude Code or Codex CLI

  • Experience with MCP

Responsibilities:

  • Develop and maintain new features and solutions with Fliplet

  • Resolve bugs and technical issues from colleagues and clients

  • Use best practice when writing code, including creating reusable code

  • Use the latest AI tools effectively to deliver work

  • Work on multiple tasks each day including bugs, features and documentation

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