Senior Back-End Software Engineer, Infra

**This position is posted by Jobgether on behalf of a partner company. We are currently looking for a Senior Back\-End Software Engineer, Infra in Brazil.** We are seeking a Senior Back\-End Software Engineer to help scale and modernize the core infrastructure of a high\-growth platform. In this role, you will take ownership of the Rails stack, ensuring it is robust, performant, and secure while building internal tools to improve developer efficiency. You will collaborate with cross\-functional teams to optimize infrastructure, reduce third\-party dependencies, and contribute to architectural decisions that impact platform scalability. This position is fully remote, with a fast\-paced, autonomous environment that encourages innovation, proactive problem solving, and a focus on long\-term impact. The role offers the opportunity to influence key systems and shape the foundation for the next stage of growth. **Accountabilities** * Maintain, upgrade, and optimize the Rails back\-end stack, including dependency management and security improvements. * Build internal tools, SDKs, and libraries to enhance developer experience and platform scalability. * Partner with front\-end engineers and SREs to support observability, performance, and reliability initiatives. * Identify and implement in\-house solutions to reduce reliance on third\-party services and infrastructure costs. * Contribute to architectural decisions that improve performance, security, and cost\-efficiency of the platform. * Participate in code reviews, knowledge sharing, and mentoring to maintain high engineering standards. **Requirements** * 5\+ years of back\-end engineering experience, ideally focused on infrastructure or platform systems. * Deep expertise in Ruby on Rails with a focus on infrastructure and architectural improvements. * Strong experience with relational databases such as MySQL and Postgres. * Proven track record of improving system performance, scalability, and reliability. * Comfortable working autonomously in a fast\-paced, fully remote environment. * Strong alignment with company values and a collaborative mindset. * CEFR C2 / ILR 5 English proficiency. **Bonus** * Experience scaling early\-stage products to 1M\+ monthly active users. * Familiarity with front\-end technologies, especially React. * Experience building internal tools or SDKs for engineering teams. * Demonstrated ability to reduce infrastructure costs through in\-house solutions. **Benefits** * Competitive USD\-based compensation ($130,000–$140,000\) with equity and annual reviews. * Fully remote: work from anywhere in the world. * 35 days of paid time off annually and paid sabbatical after 5 years. * Comprehensive medical coverage or reimbursement options. * Parental leave and family support benefits. * Home office and professional development stipends. * Biannual company retreats at exciting international locations. * Autonomy and trust to deliver outcomes independently. **Why Apply Through Jobgether?** We use an **AI\-powered matching process** to ensure your application is reviewed quickly, objectively, and fairly against the role's core requirements. Our system identifies the top\-fitting candidates, and this shortlist is then shared directly with the hiring company. The final decision and next steps (interviews, assessments) are managed by their internal team. We appreciate your interest and wish you the best! Why Apply Through Jobgether? **Data Privacy Notice:** By submitting your application, you acknowledge that Jobgether will process your personal data to evaluate your candidacy and share relevant information with the hiring employer. This processing is based on legitimate interest and pre\-contractual measures under applicable data protection laws (including GDPR). You may exercise your rights (access, rectification, erasure, objection) at any time. We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.