Software-Engineer, Full-Stack-Engineer, Python-Developer Jobs

We're hiring a Senior Software Engineer for an early-stage, US-based AI software company. You'll own large product features end to end, from a loosely defined spec to production, on a small team that ships fast while the product finds its market. This is a full-time, fully remote role on US Pacific hours.

What you'll do

• Turn large, loosely defined product specs into technical plans, milestones and shipped code
• Build across the stack: Python and FastAPI on the backend, React and TypeScript on the frontend
• Design data models across BigQuery (SQL) and Firestore (NoSQL)
• Push toward higher automation rates for customers, so the product does more of the work for them
• Surface issues early, take initiative and own your projects from design through production
• Get your engineering plans reviewed and signed off by the team, and bring product questions to leadership
• Use AI coding tools in a disciplined workflow, while fully understanding the code you ship
• Join the on-call rotation and keep production healthy

You may be a fit if

• You have senior-level experience owning large, ambiguous scopes from spec to production
• You write strong production Python, ideally with FastAPI or Flask, and work comfortably in React and TypeScript
• You model data well across relational/analytical and NoSQL databases
• You've built systems that grew in users, traffic or data, and you design for scale
• You operate autonomously and proactively, raise problems before they grow, and are reliable on deadlines
• You use AI tools daily and review their output carefully
• You're energized by fast iteration and comfortable when an experiment fails and the plan changes
• You're fluent in English and communicate well in writing, in an async-first team
• You can work 9 AM to 6 PM US Pacific Time
• You're based in Latin America (Mexico and Central America preferred for time zone overlap)

Nice to have

• Early engineer at a startup that grew significantly while you were there
• Founder or founding engineer experience or BigTech experience
• Shipped AI features: LLM integrations, chatbots, agents or support automation
• Experience with SMB-focused SaaS, payments or commerce

What we offer

• Full-time, fully remote, long-term role (independent contractor)
• Real ownership on a small, senior team with no project managers or process overhead
• A flexible day: no time tracking, you're judged on what you ship
• Direct work with the company's leadership

Originally posted on Himalayas

About the job

Mercor connects elite creative and technical talent with leading AI research labs. Headquartered in San Francisco, our investors include Benchmark, General Catalyst, Peter Thiel, Adam D'Angelo, Larry Summers, and Jack Dorsey.

Position: Senior Software Engineer, Full Stack (Python, Java, Rust, C#, C++)
Type:Contract
Compensation:$90–$110/hour
Location:Remote
Commitment:40 hours/week

Role Responsibilities

• Build and ship full-stack applications, services, and internal tools in Python, Java, Rust, C#, C++, or TypeScript to exercise frontier model capabilities.
• Integrate pre-release model APIs into working software, including tool interfaces, evaluation harnesses, and telemetry.
• Diagnose and document model and integration failure modes, translating engineering observations into clear written feedback for the research team.
• Prototype quickly against shifting requirements, delivering working increments with limited up-front specification.
• Collaborate with the engineering manager and other engineers to maintain consistency in code quality, architecture, and technical documentation.

Qualifications

Must-Have

• 6+ years of professional experience building and shipping production software.
• Deep production experience in at least one of Python, Java, Rust, C#, or C++.
• Hands-on ownership across the stack: backend service and API design, a modern front-end framework (React or equivalent), data modeling, and cloud deployment.
• Ability to onboard onto an unfamiliar codebase and deliver working code quickly.
• Strong written communication skills.

Compensation & Legal

• W-2 employment with Cincinnatus LLC.

Application Process (Takes 20–30 mins to complete)

• Upload resume
• AI interview based on your resume
• Submit form

Resources & Support

• For details about the interview process and platform information, please check:
• For any help or support, reach out to:

PS: Our team reviews applications daily. Please complete your AI interview and application steps to be considered for this opportunity.

Originally posted on Himalayas