Senior Software Engineer (Node.js/JavaScript) — E-commerce

firmly; Jandira; Presencial; BRL 120.000 - 160.000; Tempo integral

Resumo da oferta

A technology solutions firm in São Paulo is seeking a Senior Software Engineer to build and evolve backend services and APIs for e-commerce. Candidates should have over 6 years of experience in software development, particularly with Node.js and Cloudflare Workers. The position emphasizes collaboration and ownership, with opportunities for career growth and mentorship. A strong understanding of security fundamentals and proficiency in English are crucial for this role.

Serviços

Unimed Nacional health plan

Meal and food allowance

Life insurance

UniOdonto dental plan

Career growth & advancement opportunities

Learning & development support

Qualificações

• 6+ years of software development experience required.
• Strong experience as a Senior Software Engineer.
• Good foundation in data modeling and databases.

Responsabilidades

• Build and evolve backend services and APIs in Node.js / JavaScript.
• Develop edge / serverless systems on Cloudflare Workers.
• Design and implement partner integrations.

Conhecimentos

Software development (6+ years)

Node.js / JavaScript

Cloudflare Workers

APIs (REST and/or event-driven)

Data modeling and databases (SQL/NoSQL)

Security fundamentals

Advanced English

Formação académica

Bachelor's degree in Computer Science or Software Engineering

Descrição da oferta de emprego

About

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.

What you’ll do

• 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.

Required skills & experience

• 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.

Nice to have

• 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.

Benefits & Career Growth

• 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.

How to apply

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

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