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

firmly; Sorocaba; Presencial; BRL 120.000 - 150.000; Tempo integral

Resumo da oferta

A technology solutions company in Sorocaba, Brazil, is seeking a Senior Software Engineer to develop edge and serverless systems using Cloudflare Workers. The ideal candidate has over 6 years of software development experience, a strong proficiency in API design, and understanding of security fundamentals. This role offers a chance to work on critical e-commerce systems and provides various benefits, including health coverage, meal allowances, and a clear growth path within the company.

Serviços

Unimed Nacional health plan

Meal and food allowance

Life insurance

Career growth opportunities

Qualificações

• 6+ years of professional software development experience.
• Solid experience designing and operating APIs (REST and/or event-driven).
• Hands-on experience with Cloudflare Workers or strong serverless background.

Responsabilidades

• Develop edge/serverless systems on Cloudflare Workers.
• Design and implement partner integrations and data sync.
• Improve observability and operational excellence.
• Strengthen engineering quality through testing and code reviews.

Conhecimentos

API design

Distributed systems

Cloudflare Workers

Security fundamentals

Data modeling

Advanced English

Formação académica

Bachelor’s degree in Computer Science or Software Engineering

Ferramentas

Terraform

Descrição da oferta de emprego

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.

If you enjoy building high-performance APIs, working on distributed systems, and shipping cloud-native solutions with real-world scale and constraints, you'll fit right in.

What you’ll do

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, event-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.

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.

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.

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).

How to apply

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

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