1161 - Senior Full-Stack Software Engineer

GoFasti; United States; Hybrid; USD 103,000 - 112,000; Full time

Job summary

GoFasti is seeking a Senior Full-Stack Software Engineer in New York (Manhattan preferred) to join a remote-friendly team. You will own complex features in a TS/Node backend, manage a multi-app stack (Next.js web app, API, Expo mobile, Cloudflare Worker), and ensure data security and reliability across services.

You will work with a large PostgreSQL/Prisma data model, implement asynchronous event-driven patterns, and guide AI-driven code improvements while maintaining clean, well-documented PRs

Qualifications

• 6+ years as a software engineer.
• 3+ years shipping production TS/Node backends.
• Experience with financial data integrations (Plaid, Stripe, etc.).
• Deep PostgreSQL with migrations on live data.
• Experience with asynchronous systems and idempotency.
• Security-first approach to PII and data tokens.
• On-call production ownership and root-cause analyses.
• Proficient written English.

Responsibilities

• Maintain a TypeScript monorepo: Next.js web app and API, Expo mobile app, Cloudflare Worker.
• Work with PostgreSQL/Prisma data model across apps.
• Handle background systems: webhooks, batching, scheduled jobs.
• Ensure security for tokens, encrypted data, and per-user access.
• Leverage AI tools for coding; assess tool accuracy and limits.
• Review code, including own, with a critical eye.

Skills

6+ years experience

3+ years TS/Node backends

Async systems

Security-first mindset

On-call ownership

Written English proficiency

AI coding tools usage

Tools

Next.js

Node.js

PostgreSQL

Prisma

Job description

We Make Remote Work Remarkable

Hello! We are GoFasti, a Talent-as-a-Service. GoFasti bridges the gap between world-class developers and designers from LatAm and first-class companies around the globe.

We need an English-fluent Senior Full-Stack Software Engineer, based in NY, preferable Manhattan.
We are looking for someone with exceptional communication and relationship-building skills, who embraces changes while maintaining strong attention to detail. An interested and proactive person, who's constantly learning and improving their skills.

Are you the one we are looking for?

Responsibilities

• A TypeScript monorepo: a Next.js 16 web app and API, an Expo mobile app, and a Cloudflare Worker.

• A PostgreSQL + Prisma data model with dozens of models and a long migration history, shared across apps.

• Background systems: webhook handlers (Plaid, Stripe, Linq), queued inbound-message batching, and scheduled jobs.

• Security-sensitive paths: encrypted bank tokens and chat content, per-user data scoping, auth across web and mobile.

• The AI layer: LLM tool-calling over users' financial data, long-term memory, and proactive insights.

• Reviewing AI-generated code, including your own, with a skeptical eye.

Requirements

• 6+ years as a software engineer, 3+ years shipping production TypeScript/Node backends.

• Shipped work at a company that moved money or handled bank or card data (Plaid, Stripe Treasury, Unit, Synapse-era BaaS, card issuing, lending, payroll).

• Deep PostgreSQL: migrations safe to run on live data, indexes, transactions, query plans.

• Real experience with async systems: idempotency, retries, deduplicating webhooks, jobs that fail halfway.

• A security-first instinct around PII, encryption at rest, auth tokens and least privilege.

• Solo ownership of production at least once: on-call, reading error tracking, writing root-cause analyses.

• Daily use of AI coding tools (Claude Code, Cursor or similar), and clear views on where they go wrong.

• Written English good enough that a PR description or incident write-up needs no follow-up questions.

It's a plus

• Plaid in production: webhooks, item re-authentication, transaction sync cursors.

• LLMs in production: tool-calling, prompt evaluation, cost and latency control.

• Next.js App Router and React Server Components.

• SMS or messaging compliance (opt-outs, TCPA), or Stripe subscription billing.

• Expo / React Native.

Compensation

• The salary range offered for this position varies from (USD) $9,200 - $10,000 per month, depending on seniority and skillset.

• This is a hybrid position with a flexible schedule, the days and times you’ll need to be in the office may vary depending on business needs

• This position is for a full time contract, through a payroll platform.

• The talent will work remotely allocated at our client.