Senior Fullstack Software Engineer
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Job Description
Engenheira de Software Fullstack Sênior conduzindo projetos de IA e produtos digitais para empresas reais. Tomando decisões de arquitetura, direcionando agentes de IA e respondendo pelas entregas ao cliente.
Responsibilities:
- Lead client projects from the initial scoping conversation through production
- Follow the Spec-Driven workflow: gather context, specify, plan, implement with AI agents, review, and close the loop
- Turn business problems into technical designs and executable, verifiable specs for AI agents
- Work with the PM, designer, and squad to define what should be built
- Participate in client conversations about objectives, scope, and technical trade-offs
- Keep clients updated in writing
- Direct agents such as Claude Code, Cursor, or similar tools
- Review agent output using automated loops and independently verify architecture and behavior
- Make architectural decisions and take ownership of delivery
- Deliver, iterate, and document decisions and edge cases in the project context
- Use and improve the shared skills, agents, and review-loop harness every day
- Follow each client’s AI usage policies
- Comply with approved-tool requirements, data anonymization standards, Brazil’s LGPD, and all other applicable laws
Requirements:
- Senior-level experience building and delivering real software products end to end
- Experience with JavaScript/TypeScript and/or Python
- Daily use of AI agents for designing, building, debugging, and research
- Ability to turn ambiguity into structured, testable specs
- Full-stack mindset, with the ability to work across backend, frontend, AI, and product
- Ability to verify deliverables and clearly state what has and has not been verified
- High autonomy, low bureaucracy, and adaptability to rapid feedback cycles
- Valid business registration in the country of residence (CNPJ, VAT, EIN, or equivalent)
- Bank account capable of receiving payments in USD
- Ability to issue invoices, tax invoices, or an equivalent document
- English proficiency level is not specified in the application form
Benefits:
- Hourly payment in USD
- 100% remote
- Flexible allocation based on project availability and fit
- Opportunities with varying durations, scopes, and weekly time commitments
- Potential for immediate start on some opportunities
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