Job Title: [Short Term] Fullstack Engineer

Company Name: FitNext Co.

Job Details: $50-$125/hrRemoteContract

Job Url: https://hiring.cafe/viewjob/cska5rduu72yd9qv

Job Description: Posted 2mo ago[Short Term] Fullstack Engineer@ FitNext Co.View All JobsUnited States$50-$125/hrRemoteContractResponsibilities:Lead agents, Review code, Evaluate diffsRequirements Summary:Several years of software engineering experience, including 2+ years at a top-tier product company; strong full-stack development and code-review skills; excellent communication.
Location: US, UK, Canada, France, Germany, Switzerland, Denmark, Finland, Netherlands, Sweden, Iceland, Italy, Austria, Ireland, Norway
Project Overview
We're building high-quality evaluation and training datasets to improve how Large Language Models (LLMs) interact with realistic software engineering tasks. You will have the opportunity to work on a diverse range of projects from helping models traverse complex code bases to building agents that improve model performance.
Role Overview - What Does a Typical Day Look Like?
Work across multiple different projects to improve LLM performance on code. Sample projects:
Leading and delivering end-to-end agent use cases such as home automation agents, coding copilots, or creative design assistants.Collaborate with the team to identify edge cases and ambiguities in model behavior.Review and compare 3-4 model-generated code responses per task using a structured ranking system.Evaluate code diffs for correctness, code quality, style, and efficiency. Provide clear, detailed rationales explaining the reasoning behind each ranking decision.
Required Skills & Experience
Several years of software engineering experience, including 2+ continuous years at a top-tier product company (e.g., Google, Stripe, Amazon, Apple, Meta, Netflix, Microsoft, Datadog, Dropbox, Shopify, PayPal, IBM Research).Strong expertise in building full-stack applications and deploying scalable, production-grade software using modern languages and tools.Deep understanding of software architecture, design, development, debugging, and code quality/review assessment.Proven ability to review code diffs and evaluate correctness, maintainability, and efficiency.Excellent oral and written communication skills for clear, structured evaluation rationales.
Engagement Details
Commitment: flexible engagement, minimum 10 hrs/week, up to 40 hrs/week (partial PST overlap required).Type: Contractor (no medical/paid leave).Duration: 1 month with potential extensions based on performance and fit.Rate: $50–$125 per hour, depending on your seniority and location.Interview Process
Upload do CVDepois ICFCoding Challenge - 30~45mAI interview -20m
Note: Applications without a LinkedIn profile will not be approved.