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FitNext Co.

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Junior Full Stack Engineer

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Summary

Junior full-stack engineer (1–2 years experience) at an AI-native company, building frontend and backend features for accounting, SaaS billing (subscriptions, usage-based pricing), and AI-agent-driven financial workflow automation, integrating platforms like Stripe, Orb, and Metronome. Remote within LATAM, up to USD 2,500/month.

Junior Full-Stack Engineer — Accounting, SaaS Billing & Agentic AI


Location: LATAM - Remote

Salary: Up to USD 2,500/month

Experience: 1–2 years — junior candidates only


FitNext Consulting is partnering with an AI-native company to hire a Junior Full-Stack Engineer with practical development skills and a strong understanding of accounting, financial workflows, and SaaS billing.

This role is ideal for an early-career developer with an accounting background or hands-on experience building financial software.


What you’ll do


  • Build frontend and backend features supporting accounting, financial operations, and SaaS billing.
  • Integrate billing platforms such as Orb, Metronome, Stripe, or similar tools.
  • Support subscription and usage-based billing, including usage tracking, pricing, invoicing, and reconciliation.
  • Connect applications, billing platforms, and financial systems through APIs and webhooks.
  • Build or integrate AI agents to automate financial workflows.
  • Test calculations, handle exceptions, and keep financial data accurate and traceable.


Must-haves


  • 1–2 years of software engineering experience. This position is exclusively for junior candidates.
  • Practical full-stack development skills, including frontend, backend, APIs, and databases.
  • Strong understanding of accounting and financial workflows, particularly invoicing, payments, and reconciliation.
  • Familiarity with SaaS billing, including subscriptions, usage-based pricing, and billing infrastructure.
  • AI-native working habits: regular use of AI tools and agents to develop software and improve workflows.
  • Ability to validate AI-generated code and outputs and translate financial requirements into reliable software.
  • An accounting background or relevant experience building financial tools.
  • Strong attention to detail and accuracy when working with financial data.


Nice to have


  • Hands-on experience with Orb, Metronome, Stripe Billing, or comparable platforms.
  • Experience with usage metering, billing adjustments, credits, or failed-payment workflows.
  • Experience with AI agents, LLM APIs, or financial workflow automation.




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