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

firmly; Teletrabalho; BRL 120.000 - 160.000; Tempo integral

Resumo da oferta

A leading e-commerce technology company in Brazil seeks a Senior Software Engineer to build and evolve backend services and APIs. The role includes developing serverless systems, designing partner integrations, and improving observability. Candidates should have 6+ years of software development experience, strong expertise in Node.js, and familiarity with Cloudflare Workers. The position offers benefits like health insurance, meal allowances, and career advancement opportunities, promoting an environment of learning and autonomy.

Serviços

Unimed Nacional health plan

Meal and food allowance

Life insurance

UniOdonto dental plan

Career growth opportunities

Ownership and autonomy

Learning and development support

Qualificações

• 6+ years of professional software development experience.
• Experience as a Senior Software Engineer building production-grade backends.
• Hands-on experience with Cloudflare Workers or a strong serverless background.

Responsabilidades

• Build and evolve backend services and APIs for e-commerce flows.
• Develop serverless systems focused on low latency and scalability.
• Design and implement partner integrations and near real-time data sync.

Conhecimentos

Node.js

JavaScript

API design

Cloudflare Workers

SQL

NoSQL

English (advanced)

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

• Build and evolve backend services and APIs in Node.js/JavaScript for critical e-commerce/checkout flows.
• Develop edge/serverless systems on Cloudflare Workers 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.
• 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 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 and attach your resume (PDF).

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