1159 - Senior Full-Stack Software Engineer

GoFasti; United States; Remote; USD 33,000 - 36,000; Full time

Job summary

GoFasti is seeking a senior software engineer to build and operate a financial technology product across web, mobile, APIs, and background services. The role covers full-stack development, data modeling, integrations, security-sensitive workflows, and AI features that work with users' financial information.

You’ll also take responsibility for production reliability and carefully review AI-generated code. You’ll own production issues, review generated code, and document incidents.

Qualifications

• 6+ years of software engineering experience.
• 3+ years shipping TypeScript and Node.js backends.
• Experience with payments, banking data, or payroll data.
• Strong PostgreSQL skills, including safe migrations and indexing.
• Experience with asynchronous systems, retries, and idempotency.
• Security-minded handling of personal information and authentication tokens.
• On-call production ownership and incident write-ups.
• Experience using AI coding tools with critical judgment.
• Clear written English for pull requests and incident reports.

Responsibilities

• Develop features across a TypeScript monorepo (web, API, mobile, edge).
• Evolve a shared PostgreSQL data model with Prisma migrations.
• Build webhook handlers, queued processing, and scheduled jobs with retries.
• Protect data with encryption and robust authentication across web/mobile.
• DevelopAI capabilities for tool use, memory, and insights.
• Own production issues, review generated code, and document incidents.

Skills

TypeScript

Node.js

Security-minded

Production ownership

English writing

Tools

PostgreSQL

Prisma

Webhook processing

AI coding tools

Next.js

React Server Components

Job description

Role overview

Build and operate a financial technology product across web, mobile, APIs, and background services. The role spans full-stack development, data modeling, integrations, security-sensitive workflows, and AI features that work with users' financial information. You'll also take responsibility for production reliability and carefully review AI-generated code.

Responsibilities

• Develop features across a TypeScript monorepo containing a web app, API, mobile app, and edge worker.
• Evolve a shared PostgreSQL data model and manage its schema changes with Prisma.
• Build and maintain webhook handlers, queued message processing, and scheduled jobs, accounting for retries and partial failures.
• Protect financial and chat data through encryption, user-level access controls, and authentication across web and mobile.
• Build AI capabilities such as tool use over financial data, persistent memory, and proactive insights.
• Own production issues, review generated code, and document incidents and their causes.

Requirements

• At least 6 years of software engineering experience, including 3 or more years shipping TypeScript and Node.js backends.
• Experience at a company handling money, bank data, or card data, such as payments, banking infrastructure, lending, or payroll.
• Strong PostgreSQL skills, including safe production migrations, indexing, transactions, and query analysis.
• Practical experience with asynchronous systems, including idempotency, retries, webhook deduplication, and jobs that fail partway through.
• Security-minded handling of personal information, encryption, authentication tokens, and least-privilege access.
• Previous ownership of production systems, including on-call work, error investigation, and root-cause write-ups.
• Regular use of AI coding tools, with the judgment to identify and correct their errors.
• Written English suitable for clear pull request descriptions and incident reports.

Nice to have

• Production experience with bank-data integrations, including webhooks, account re-authentication, or transaction synchronization.
• Production experience with language models, including tool use, evaluation, and cost or latency management.
• Experience with modern Next.js and React Server Components, Expo or React Native, messaging compliance, or subscription billing.

Benefits and work setup

This is a full-time contract role, paid through a payroll platform, and performed remotely from Latin America. The stated monthly compensation range is USD 3,000-3,200, depending on experience and skills.