Senior Fullstack Software Engineer

This is a fully remote position, open to applicants in Brazil.

📋 Description

• Oversee client projects from the initial scoping discussion to production.

• Adhere to the Spec-Driven workflow: gather context, specify, plan, implement with AI agents, review, and close the loop.

• Convert business challenges into technical designs and actionable, verifiable specifications for AI agents.

• Collaborate with the project manager, designer, and team to determine what needs to be developed.

• Engage in client discussions regarding objectives, scope, and technical trade-offs.

• Keep clients informed through written updates.

• Direct AI agents such as Claude Code, Cursor, or comparable tools.

• Evaluate agent output using automated loops and independently validate architecture and behavior.

• Make architectural choices and take responsibility for delivery.

• Deliver, refine, and document decisions and edge cases within the project context.

• Utilize and enhance shared skills, agents, and review-loop harness on a daily basis.

• Adhere to each client’s AI usage policies.

• Comply with approved-tool requirements, data anonymization standards, Brazil’s LGPD, and all other relevant laws.

⛳️ Requirements

• Senior-level experience in building and delivering software products from start to finish.

• Proficiency in JavaScript/TypeScript and/or Python.

• Daily utilization of AI agents for design, development, debugging, and research purposes.

• Capability to transform ambiguity into structured, testable specifications.

• Full-stack mindset, able to work across backend, frontend, AI, and product domains.

• Ability to verify deliverables and clearly communicate what has and has not been verified.

• High degree of autonomy, minimal bureaucracy, and adaptability to rapid feedback cycles.

• Valid business registration in the country of residence (CNPJ, VAT, EIN, or equivalent).

• Bank account able to receive payments in USD.

• Capacity to issue invoices, tax invoices, or an equivalent document.

• English proficiency level is not specified in the application form.

🏝️ Benefits

• Hourly compensation in USD.

• 100% remote work.

• Flexible allocation based on project availability and suitability.

• Opportunities with varying durations, scopes, and weekly time commitments.

• Potential for immediate engagement on certain opportunities.