ByteDance's Dev Infra team seeks a Machine Learning Engineer Intern to leverage LLMs for automated unit test generation.  Responsibilities include designing and implementing frameworks for LLM-based test generation, developing LLMs for high-quality test creation (prompt engineering, model fine-tuning), creating evaluation systems for AI-generated tests, integrating these tests into CI/CD pipelines, and establishing best practices for hybrid human/AI test development. The 12-week internship (May/June 2025 start) requires strong programming skills (Python, Java, TypeScript, Go preferred), expertise in prompt engineering and LLM fine-tuning, unit testing framework experience, and a solid understanding of software testing principles.

<p>Where imagination meets innovation, delivering limitless gaming experiences.</p>

ByteDance

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<div class="jobDetail__1UFk5 jobDetail" style="transform: translate(0px, 0px); opacity: 1;"><div class="block-title">Responsibilities</div><div class="block-content">About ByteDance
Founded in 2012, ByteDance's mission is to inspire creativity and enrich life. With a suite of more than a dozen products, including TikTok as well as platforms specific to the China market, including Toutiao, Douyin, and Xigua, ByteDance has made it easier and more fun for people to connect with, consume, and create content. 

Why Join Us
Creation is the core of ByteDance's purpose. Our products are built to help imaginations thrive. This is doubly true of the teams that make our innovations possible. 
Together, we inspire creativity and enrich life - a mission we aim towards achieving every day. 
To us, every challenge, no matter how ambiguous, is an opportunity; to learn, to innovate, and to grow as one team. Status quo? Never. Courage? Always. 
At ByteDance, we create together and grow together. That's how we drive impact - for ourselves, our company, and the users we serve. 
Join us.

Team Introduction: 
We are the Dev Infra team behind all applications in ByteDance. The client includes mobile frontend and developer tools. We proudly serve billions of users across the world and ten of thousands of engineers in ByteDance by building and supporting large-scale services, frameworks, tools and systems.

We are seeking an experienced Test Automation Engineer to leverage Large Language Models (LLMs) for automatically generating high quality unit tests. The ideal candidate will combine traditional software testing expertise with innovative AI-driven approaches to generate tests and improve code coverage.

We are looking for talented individuals to join us for an internship in 2025. Internships at ByteDance aim to offer students industry exposure and hands-on experience. Turn your ambitions into reality as your inspiration brings infinite opportunities at ByteDance.

This Internship Program runs for 12 weeks beginning in May/June 2025. Successful candidates must be able to commit to one of the following summer internship start dates below: 
Monday, May 12
Monday, May 19
Tuesday May 27 (Memorial Day May 26)
Monday, June 9
Monday, June 23

We will prioritize candidates who are able to commit to these start dates. Please state your availability clearly in your resume (Start date, End date).

Candidates can apply to a maximum of two positions and will be considered for jobs in the order you apply. The application limit is applicable to ByteDance and its affiliates' jobs globally. Applications will be reviewed on a rolling basis. We encourage you to apply early.

Responsibilities
- Design and implement frameworks for generating unit tests using LLMs
- Develop LLMs to ensure high-quality test generation, including prompt engineering, model fine-tuning
- Create evaluation systems to evaluate the correctness and completeness of AI-generated tests
- Integrate LLM-generated tests into existing CI/CD pipelines
- Establish best practices for hybrid human/AI test development</div><div class="block-title">Qualifications</div><div class="block-content">Minimum Qualifications
- Currently pursuing a Master/PhD in computer science or a related technical discipline;
- Able to commit to working for minimum 12 weeks during Summer 2025;
- Strong programming skills in languages like Python, Java, TypeScript, Go (is a bonus)
- Strong skills in prompt engineering, LLM model fine-tuning, data processing, and data analysis
- Experience with unit testing frameworks (gomock, pytest, JUnit, Jest, etc.)
- Understanding of software testing principles and methodologies

Preferred Qualifications:
- Graduating December 2025 onwards with the intent to return to  degree program after the completion of the internship.

ByteDance is committed to creating an inclusive space where employees are valued for their skills, experiences, and unique perspectives. Our platform connects people from across the globe and so does our workplace. At ByteDance, our mission is to inspire creativity and bring joy. To achieve that goal, we are committed to celebrating our diverse voices and to creating an environment that reflects the many communities we reach. We are passionate about this and hope you are too.

ByteDance Inc. is committed to providing reasonable accommodations in our recruitment processes for candidates with disabilities, pregnancy, sincerely held religious beliefs or other reasons protected by applicable laws. If you need assistance or a reasonable accommodation, please reach out to us at https://shorturl.at/cdpT2</div><div class="block-title">Job Information</div><div class="block-content block-content-jobinfo"><div class="job-info-item__UZSBL job-info-item-lang__3Il6m"><span>【For Pay Transparency】Compensation Description (Hourly) - Campus Intern</span><div class="template__2vEr7"><div class="editor-content" style="font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif, 'Roboto', 'Apple Color Emoji', 'Segoe UI Emoji', 'Segoe UI Symbol'; color: #1f2329; word-wrap: break-word; white-space: pre-wrap;"><p style="font-size: 14px; text-align: left;">The hourly rate range for this position in the selected city is $45- $60. <span>​</span></p><p style="font-size: 14px; text-align: left;">Benefits may vary depending on the nature of employment and the country work location. Interns have day one access to health insurance, life insurance, wellbeing benefits and more. Interns also receive 10 paid holidays per year and paid sick time (56 hours if hired in first half of year, 40 if hired in second half of year).<span>​</span></p><p style="font-size: 14px; text-align: left;">The Company reserves the right to modify or change these benefits programs at any time, with or without notice.<span>​</span></p><p style="font-size: 14px; text-align: left;">For Los Angeles County (unincorporated) Candidates:<span>​</span></p><p style="font-size: 14px; text-align: left;">Qualified applicants with arrest or conviction records will be considered for employment in accordance with all federal, state, and local laws including the Los Angeles County Fair Chance Ordinance for Employers and the California Fair Chance Act. Our company believes that criminal history may have a direct, adverse and negative relationship on the following job duties, potentially resulting in the withdrawal of the conditional offer of employment:<span>​</span></p><p style="font-size: 14px; text-align: left;">1. Interacting and occasionally having unsupervised contact with internal/external clients and/or colleagues;<span>​</span></p><p style="font-size: 14px; text-align: left;">2. Appropriately handling and managing confidential information including proprietary and trade secret information and access to information technology systems; and<span>​</span></p><p style="font-size: 14px; text-align: left;">3. Exercising sound judgment.<span>​</span></p></div></div></div></div></div>

Machine Learning Engineer Intern