Research Engineer – Agent Systems & AI Coding Environment; Seed Infra Platform

Research Engineer – Agent Systems & AI Coding Environment (Seed Infra Platform)

Location:

Seattle

Team:
Technology

Employment Type:

Regular

Job Code: A208627

About the Team The Seed Infrastructures team oversees the distributed training, reinforcement learning framework, high-performance inference, and heterogeneous hardware compilation technologies for AI foundation models. Responsibilities:

• Build agent harness and execution environments for AI coding and knowledge tasks (code execution, tool integration, sandboxing, system interaction)
• Develop scalable orchestration frameworks for multi-step agent workflows (planning, tool use, memory, coordination)
• Design evaluation and benchmarking systems to measure agent performance across complex, long-horizon tasks
• Improve agent performance via prompting, data curation, and post-training in collaboration with model and RL teams
• Partner with research and product teams to product ionize agent systems

Minimum Qualifications:

• Bachelor's degree or above in Computer Science or a related field
• Strong programming skills (Python or similar) and solid system-building experience
• Experience with LLM-based systems, pipelines, or tool-integrated workflows
• Understanding of system design and building scalable infrastructure
• Experience building agent harness / runtime systems or AI coding environments

Preferred Qualifications:

• Familiarity with evaluation frameworks, prompting / fine tuning / RL, or large-scale experimentation

For Pay Transparency Compensation Description (Annually):
The base salary range for this position in the selected city is $232560 - $427500 annually. Compensation may vary outside of this range depending on a number of factors, including a candidate's qualifications, skills, competencies and experience, and location. Base pay is one part of the Total Package that is provided to compensate and recognize employees for their work, and this role may be eligible for additional discretionary bonuses/incentives, and restricted stock units.

Benefits may vary depending on the nature of employment and the country work location. Employees have day one access to medical, dental, and vision insurance, a 401(k) savings plan with company match, paid parental leave, short-term and long-term disability coverage, life insurance, wellbeing benefits, among others. Employees also receive 10 paid holidays per year, 10 paid sick days per year and 17 days of Paid Personal Time (prorated upon hire with increasing accruals by tenure).

The Company reserves the right to modify or change these benefits programs at any time, with or without notice.

For Los Angeles County (unincorporated) Candidates:
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:
1. Interacting and occasionally having unsupervised contact with internal/external clients and/or colleagues;
2. Appropriately handling and managing confidential information including proprietary and trade secret information and access to information technology systems; and 3. Exercising sound judgment.

Established in 2023, the Byte Dance Seed team is dedicated to pioneering new paths toward artificial general intelligence. We aspire to advance the frontier of intelligence to drive progress for both technology and society. With a long-term vision for the AI sector, the Seed team's research spans MLLM, Gen Media, AI for Science, and Robotics. We maintain a global presence with laboratories and career opportunities across China, Singapore, and the United States.

To date, we have launched industry-leading general foundation models and cutting-edge multimodal capabilities. Our technology powers over 50 application scenarios — including Doubao, Jimeng, TRAE, Dola and Dreamnia — and serves enterprise…