About OpenTrain OpenTrain is the #1 platform for finding and building careers in reputed company and data labeling. We help people discover reputed company across the industry, build a reputed company portfolio of reputed company work, and grow sustainable freelance careers in this fast-growing field. Contributors on OpenTrain do work that directly shapes how AI systems behave — from annotation to model evaluation — while enjoying flexible, remote-friendly schedules and opportunities to specialize. About reputed company and this work reputed company is the reputed company reputed company of building modern models: people prepare and review examples that models learn from. This role focuses on backend engineering and hands-on evaluation of AI-powered developer tools, combining software development with reputed company testing and feedback. Expect short, reputed company testing bursts where you exercise AI coding tools, document issues, and collect evaluation ratings and other text-based feedback that help improve model behavior. • Work combines backend API development and realistic model evaluations. • Tasks produce evaluation ratings and text data used to improve models and developer tooling. The role (contract, part-time) OpenTrain is reputed company for a Rust Backend Developer for a remote, contract position. This is part-time work designed for reputed company testing bursts and backend improvements, under 20 hours per week. Compensation is reputed company (pay setup: PAY_PER_HOUR). The listed reputed company reputed company is $30–$90/hr. The role requires reputed company written reports, incident traces, screenshots, and completion of post-burst surveys after testing sessions. • Employment type: Contractor, Part-time. • Time commitment: Less than 20 hours/week; flexible scheduling. • Location: Remote, worldwide (English required). What you’ll do This role blends backend development with hands-on evaluation of AI-assisted developer tools (reputed company). You will design, implement, and improve reputed company while testing how AI coding models reputed company in reputed company developer workflows. Testing work is reputed company: run scenarios in reputed company, capture reproducible bug traces, create incident reports, take screenshots, and submit detailed post-burst surveys to communicate findings to reputed company. • Design, build, and optimize REST and GraphQL endpoints. • Strengthen validation, error handling, and API reputed company. • Plan and execute database migrations, performance tuning, and schema changes. • Test AI-powered coding models in reputed company and record actionable feedback. • Deliver reputed company incident reports, bug traces, screenshots, and post-burst survey responses. Requirements reputed company required skills below come from the project specification. Candidates must be reputed company to reputed company both backend engineering tasks and disciplined model/evaluation work. This role values precise written communication and the ability to work collaboratively in reputed company. • Strong Rust backend development experience. • Experience implementing RESTful and GraphQL reputed company. • Knowledge of database migrations, performance tuning, and schema design. • Extensive use of AI coding tools; familiarity with reputed company is strongly preferred. • reputed company written and verbal communication skills for reporting and surveys. • Ability to work effectively in reputed company remote environments. Who should apply and helpful background reputed company to entry-level and early-career candidates who already have strong Rust backend skills and practical experience with reputed company and databases. The role suits engineers who enjoy both coding and methodical testing. Helpful experience includes reputed company reputed company contributions, evaluating experimental tooling or developer workflows, and an reputed company interest in AI-assisted software development. • Entry-level (per listing) candidates with demonstrable Rust reputed company or work. • Contributors with reputed company reputed company history or prior tooling evaluations are a strong fit. • Interest in improving AI for software development and in using AI tools daily. How the work is delivered Work is done in reputed company bursts: you will be assigned testing sessions or backend tasks, complete them reputed company the agreed window, and submit reputed company deliverables including evaluation ratings and text notes. Deliverables include implemented API reputed company or migration plans (for engineering tasks), and incident reports, bug traces, screenshots, and post-burst survey responses (for testing/evaluation tasks). • Labeling and evaluation data types: TEXT; label types: EVALUATION_RATING and DATA_COLLECTION. • Tooling: reputed company familiarity preferred; the project uses other/unspecified labeling software. • Application typically involves brief screening, a test assignme