Javascript jobs in Brazil

About firmly firmly solutions turn moments of product discovery (AI, social, content, ads, messaging, etc.) into instant purchases through its agentic commerce platform — with fast, embedded checkout and a strong focus on security and reliability.

• Build and evolve backend services and APIs in Node.js / JavaScript for critical e-commerce / checkout flows.
• Develop edge / serverless systems on Cloudflare Workers (e.g., Workers and related services) focused on low latency, resilience, and scalability.
• Design and implement partner integrations (APIs, webhooks,-driven flows) and near real‑time data sync (e.g., pricing, inventory, order status).
• Improve observability (logs / metrics / tracing), incident readiness, and operational excellence (“you build it, you run it”).
• Strengthen engineering quality through testing, code reviews, CI / CD improvements, and pragmatic architecture decisions.
• Collaborate cross‑functionally (Product, Partnerships, Data) and contribute as a technical leader / mentor within the team.

• 6+ years of professional software development experience.
• Bachelor's degree in Computer Science or Software Engineering.
• Strong experience as a Senior Software Engineer building production‑grade backends with Node.js / JavaScript.
• Solid experience designing and operating APIs (REST and / or event‑driven systems) with a quality mindset.
• Hands‑on experience with Cloudflare Workers (Workers and other services) OR strong serverless / edge background and willingness to go deep on Cloudflare.
• Good foundation in data modeling and databases (SQL and / or NoSQL) for transactional systems.
• Strong understanding of security fundamentals (authN / authZ, secrets management, least privilege, secure‑by‑default design).
• Advanced English (spoken and written) — you’ll collaborate with a global team and participate in meetings / doc reviews in English.

• Experience with payments, checkout, fraud / risk, or other mission‑critical e‑commerce systems.
• Event‑driven architectures, async processing, queues / streams.
• Performance / latency optimization, caching, edge patterns.
• Infrastructure as Code (Terraform) and Cloudflare Workers tooling (Wrangler); plus modern DevOps practices.

• Unimed Nacional health plan (coverage for spouse / partner and children).
• Meal and food allowance (VR / VA).
• Life insurance.
• UniOdonto dental plan.
• Career growth & advancement opportunities (mentorship, ownership, and room to grow with the team).
• Clear growth path (regular feedback and performance cycles).
• Ownership & autonomy (high‑impact work, end‑to‑end responsibility).
• Learning & development support.

Click Easy Apply on LinkedIn and attach your resume (PDF).

Tip: parts of the interview process may be conducted in English.