Senior Software Engineer – Back End

Role Overview

• Develop new features and evolve existing systems with a focus on quality, scalability, and maintainability.
• Have strong knowledge of software architecture and the ability to propose structural improvements to the system.
• Implement integrations between internal and external services (APIs, microservices, distributed systems).
• Write clean, testable, and efficient code, following engineering best practices and area-defined standards.
• Create and run automated and unit tests to ensure delivery quality.
• Work closely with product, QA, front-end, and data teams to ensure end-to-end delivery.
• Actively participate in code reviews, contributing to collective learning and maintaining technical standards.
• Monitor and optimize application performance, identifying and resolving bottlenecks.
• Document flows, architectures, and adopted practices to strengthen knowledge sharing.
• Collaborate in agile ceremonies (plannings, refinements, retrospectives) with a proactive and solution-oriented approach.
• Mentor junior and mid-level developers.

Requirements

• Solid experience in back-end development with Node.js and Java.
• Experience with relational and non-relational databases (MySQL, MongoDB).
• Experience with large volumes of data and complex/heavy queries.
• Knowledge of modular service architectures and RESTful APIs.
• Experience with automated testing, version control (Git), and CI/CD.
• Previous work in digital product teams and agile methodologies.
• Ability to analyze and solve complex problems, with good communication with technical and business stakeholders.
• Experience in healthtechs or companies with high technical complexity (plus).
• Experience with AWS (EC2, RDS, SQS, Elastic Beanstalk) (plus).
• Previous experience developing solutions using AI tools (Claude, Cursor, Codex, etc.) (plus).
• Experience in observability, monitoring, and SRE best practices (plus).
• Previous experience in high-scale, high-data-volume environments (plus).

Tech Stack

• AWS
• EC2
• Java
• MongoDB
• MySQL
• Node.js

Benefits

• CAJU card: monthly credit of R$ 1,059.00 distributed across categories: Meals, Food, Mobility, Health, Home Office, Culture, and Education.
• AMIL S450 – APTO Health Plan: 30% co-payment for consultations and exams and 40% for PS; extendable to legal dependents (spouses and/or children up to 24 years). Dependent fees are deducted from payroll. Per-dependent cost: R$ 506.86 per life plus co-payment.
• Omni Saúde: Intended for purchasing medications with a medical prescription. A monthly balance of R$ 100.00 is made available to the employee exclusively for purchasing medications prescribed by our Conexa Hospital.
• Free access to Conexa and Zenklub platforms, with online consultations to support your mental and physical health.
• Daycare assistance according to the regional collective bargaining agreement and extended maternity/paternity leave: we offer the option to extend maternity leave to 6 months. For fathers, paternity leave is 30 days.
• SULAMERICA Life Insurance: We want you to feel secure knowing that you and your loved ones are protected, no matter what happens.
• Day off in your birthday month: Take time off during your birthday month to celebrate as you wish.
• Totalpass and Wellhub: To help you stay on track with your fitness goals.
• Course Discounts: For your personal and professional development, Conexa offers educational partnerships with several institutions.
• SESC Benefit: Access to sports, culture, leisure activities, courses, and more with special conditions for employees and dependents.
• Transportation Voucher: 6% salary deduction if opted.