Full Stack Engineer (React/Node.js)
Department: Technology
Location: Brazil (Remote), Buenos Aires Province
Employment Type: FullTime
About Pyyne
Pyyne is a modern technology consultancy engineering the next generation of digital products and services.
At Pyyne, we believe in using technology to unlock business potential, create sustainable growth, and drive forward digital excellence. Our solutions range from advanced Software Engineering, Cloud, and Data & AI solutions.
About the Role
Our client is an AI-powered growth intelligence platform for DTC brands, aggregating data from Meta, Google Ads, Shopify, TikTok, and Klaviyo with Claude AI layered on top for analysis and content generation.
The platform was built by a non-technical founder using AI-assisted tools and is not yet production-ready. This engagement is focused on turning it into a properly functioning, production-grade SaaS product with a real path to market. The current codebase has meaningful functionality but requires a disciplined engineering hand to harden, complete, and scale. We’ve done the due diligence, reviewed the code, and begun making the appropriate changes, now we need a full time dev to come in and own the product.
You'll be the sole engineer on this project, working directly with product stakeholders. You'll own the full technical roadmap and execution.
A discovery phase is currently underway. The new engineer on this project will receive a technical handoff and prioritized backlog before work begins.
Key Responsibilities
Security
Remediate plaintext storage of OAuth tokens and API keys in the database
Enforce proper route-level authorization — currently authenticated users can access and mutate resources belonging to other clients
Implement input validation across all API routes
Compliance
Broken unsubscribe links in all outgoing emails (CAN-SPAM)
Fabricated data displayed to users without disclosure (simulated order feed, randomized revenue predictions)
Integrations
Complete and stabilize connections to Meta, Google Ads, TikTok, Shopify, and Klaviyo
Implement the Google Ads token refresh flow (refresh token is stored but never used)
Wire up the Shopify webhook handler (written but not connected)
Resolve Meta API version inconsistencies across the codebase
Add rate limit handling to sync functions
Infrastructure
Set up error monitoring
Establish a CI/CD pipeline and staging environment
Introduce test coverage for critical paths
Migrate schema management from prisma.db push to a proper migration history
Must Have Skills:
5+ years of full-stack engineering experience
Strong TypeScript and Next.js (App Router)
PostgreSQL and Prisma ORM
Experience inheriting, auditing, and refactoring existing codebases
Experience with LLM API integrations in production, including cost management and rate limiting
Familiarity with multi-tenant SaaS architecture
Comfortable owning a project solo and communicating directly with a non-technical stakeholder
Nice To Have Skills:
Experience with any of the following Integrations: Meta Graph API, Google Ads API, Shopify Admin API, TikTok Ads API, Klaviyo API
Benefits:
Flexible remote working environment.
Career development opportunities in a fast-growing company.
There are more than 50,000 engineering jobs:
Subscribe to membership and unlock all jobs
Engineering Jobs
60,000+ jobs from 4,500+ well-funded companies
Updated Daily
New jobs are added every day as companies post them
Refined Search
Use filters like skill, location, etc to narrow results
Become a member
🥳🥳🥳 452 happy customers and counting...
Overall, over 80% of customers chose to renew their subscriptions after the initial sign-up.
To try it out
For active job seekers
For those who are passive looking
Cancel anytime
Frequently Asked Questions
- We prioritize job seekers as our customers, unlike bigger job sites, by charging a small fee to provide them with curated access to the best companies and up-to-date jobs. This focus allows us to deliver a more personalized and effective job search experience.
- We've got over 200,000 jobs from 15,000+ vetted companies. No fake or sleazy jobs here!
- We aggregate jobs from 15,000+ companies' career pages, so you can be sure that you're getting the most up-to-date and relevant jobs.
- We're the only job board *for* software engineers, *by* software engineers… in case you needed a reminder! We add thousands of new jobs daily and offer powerful search filters just for you. 🛠️
- Every single hour! We add 2,000-3,000 new jobs daily, so you'll always have fresh opportunities. 🚀
- Typically, job searches take 3-6 months. EchoJobs helps you spend more time applying and less time hunting. 🎯
- Check daily! We're always updating with new jobs. Set up job alerts for even quicker access. 📅
What Fellow Engineers Say