Stefanini Brasil

Full Stack Developer – Mid-level

Stefanini Brasil

full-time

Posted on:

Location Type: Hybrid

Location: São Paulo • Brazil

Visit company website

Explore more

✨ AI Apply
Apply

Tech Stack

AndroidAWSDockerEC2GrafanaJavaJavaScriptKotlinNode.jsPostgresReactReact NativeTypeScript

About the role

  • Develop and evolve the front-of-store (POS) application and associated backend services, ensuring high availability, performance and an excellent user experience.
  • Work on integration and certification of POS terminals with payment acquirers in the Brazilian market and participate in the app release cycle.
  • Implement end-to-end features: mobile (React Native) and backend (Node.js/TypeScript).
  • Integrate and certify acquirer SDKs/APIs and Android POS SDKs (tests for credit/debit, installment payments, refunds, contactless, logs and evidence).
  • Participate in the app publishing process (Google Play/App Store) or corporate/MDM distribution: versioning, signing and release tracks.
  • Develop and maintain REST APIs, integrations with legacy systems and third-party services.
  • Write tests, perform code reviews and collaborate on continuous improvement of quality and performance.
  • Monitor and troubleshoot production incidents, with team support.
  • Document technical flows, integrations and key decisions.
  • Participate in agile ceremonies, estimations and planning.
  • Support field pilots/certifications when necessary (occasional travel).

Requirements

  • Experience in software development (Mid-level), including:
  • React Native (Android-focused)
  • Node.js and TypeScript (REST APIs)
  • Integration with SDKs/APIs and best practices for payment flows (idempotency, error handling and timeouts)
  • Relational database (PostgreSQL) and writing performant queries
  • Git, basic CI/CD pipelines and environment organization (dev/staging/production)
  • Monitoring and logging (e.g., Sentry, CloudWatch, Grafana/Kibana) focused on transaction traceability (a plus)
  • Security and LGPD (Brazilian data protection) applied to apps and APIs (secure storage, encryption, tokens)
  • Technical English for reading documentation and SDKs
  • Nice to have / Differentials
  • Native Android knowledge (Kotlin/Java) sufficient to create/maintain native bridges in React Native.
  • Practical experience publishing apps (Google Play Console and/or App Store Connect) or corporate/MDM distribution.
  • Experience with acquirers/TEF in Brazil (Cielo, Rede, Stone, Getnet, PagSeguro, Adyen, PayGo or SiTef/M-SiTef) and EMV certification/homologation processes.
  • Experience with Android POS devices and SDKs (Gertec, Ingenico, Tectoy/Sunmi).
  • Offline-first strategies, queues/messaging (e.g., SQS) and resilience in unstable environments.
  • Fiscal POS knowledge (NFC-e, SAT, CF-e/MFE) and integration with printers.
  • AWS (EC2/Lambda/SQS/Secrets), Docker and observability.
  • E2E mobile testing (e.g., Detox) and TDD/BDD.
  • React Native performance optimization (Hermes, Reanimated, memoization).
  • NoSQL / non-relational databases.
Benefits
  • Meal or food voucher (vale-alimentação or vale-refeição).
  • Discounts on courses, universities and language schools.
  • Stefanini Academy — platform with free, up-to-date online courses and certificates.
  • Mentoring.
  • Benefits club for medical consultations and exams.
  • Health insurance.
  • Dental insurance.
  • Benefits and discounts at partner establishments.
  • Travel club.
  • Pet care benefits.
Applicant Tracking System Keywords

Tip: use these terms in your resume and cover letter to boost ATS matches.

Hard Skills & Tools
React NativeNode.jsTypeScriptREST APIsPostgreSQLGitCI/CDSentryCloudWatchAWS
Soft Skills
collaborationcommunicationproblem-solvingagile methodologiesdocumentation