Sr. Full-Stack Software Engineer - Remote

Location: Global, Fully Remote
Job Type: Contractor | ~15 hours/week
Schedule: Versátil

We're looking for experienced Full-Stack Software Engineers to support an AI training project focused on software development, debugging, code evaluation, and technical problem-solving.

Full-Stack Software Engineer

Location: Global, Fully Remote
Job Type: Contractor | ~15 hours/week
Schedule: Flexible

We're looking for experienced Full-Stack Software Engineers to support an AI training project focused on software development, debugging, code evaluation, and technical problem-solving.

Key Responsibilities

- Develop and debug front-end and back-end applications.
- Build features, APIs, services, and data models.
- Understand and work across unfamiliar codebases.
- Troubleshoot application, API, database, and integration issues.
- Review and evaluate AI-generated code for correctness, security, performance, and maintainability.
- Translate and adapt software builds between programming languages.

Required Skills

- Python
- React
- JavaScript
- Java
- Node.js
- Rust
- Go
- TypeScript
- Strong full-stack development experience
- Experience with APIs, databases, application architecture, and debugging

Hiring Process

- Submit application and screening questions.
- Complete a ~30-minute AI interview.
- Complete a technical assessment, if required.
- Hiring manager review.

Our client is a remote product studio that builds MVPs and custom software for startups and companies past the idea stage. Clients pay for each build,



and a small team works in two-week sprints with AI coding tools used every day. Clients are startup founders and their teams, so developers explain tradeoffs to them directly.

They've been at it since 2020 and were profitable in 2025, with a 30% net margin. After building their own AI systems, they tripled monthly revenue with the same team size. Clients rate them 4.9 out of 5 in verified reviews, and the startups they build for have raised more than $25M in venture funding.

Your Role

You'll be the only mobile developer on a new offline-first iOS and Android app, starting from the first project setup. The developer accounts, build pipeline and release tracks don't exist yet, so that's where you begin, and you stay on the same app through its public launch on the App Store and Google Play.

Sprints run two weeks with four to five features each, and coding agents write most of the first draft. You review every diff, add the tests the agents missed, and make the calls on sync, storage and releases. If you'd rather have a QA team or a release manager handle testing and store submissions, this probably isn't the right seat.





You report to the studio's leadership and work day to day with the lead developer and a backend developer, who's your counterpart on the sync and upload APIs. You'll also write risk notes and tradeoffs directly to the client team, with your recommendation attached. Success means sprints that close with their acceptance criteria verified, a write queue that neither loses nor doubles a submission on real devices, and an app live on both stores where sync failures show up in monitoring before anyone reports them.

You'll:

Set up Apple and Google developer accounts, signing, CI builds and testing tracks

Build the local storage, write queue and retry logic that keep the app working offline

Agree the sync and upload APIs with the backend developer, and decide how conflicting edits resolve

Build phone-number sign-in with SMS codes, and push notifications that fall back to SMS

Build camera capture and e-signature flows that save each signed record as a new version

Measure and improve startup time, memory and app size on low-end Android phones

Handle store submissions, privacy disclosures and review rejections, and add crash and sync monitoring

You Bring:

4+ years building mobile applications, including React Native applications released on both the App Store and Google Play

Offline-first work you built yourself: local storage, queued writes, retries and conflict handling

Performance tuning on low-end Android, with startup time or memory measured before and after a change

Daily use of Cursor, Claude Co

📌 Remote Full-Stack Engineer — React/Typescript For Ai Training (Rincón de los Sauces)
🏢 Bluelightconsulting
📍 Rincón de los Sauces