As an Embedded Software Engineer at Zühlke, collaborate on innovative software solutions for diverse industries. Engage in programming, requirements engineering, and direct client communication in an agile environment.
About the role
- Full Stack Developer at Stefanini working on mobile and backend applications. Collaborating with teams to enhance payment systems for Brazilian market.
Responsibilities
- 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.
Job title
Job type
Experience level
Salary
Not specified
Degree requirement
No Education Requirement
Tech skills
Location requirements
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