Senior Full Stack Engineer

About The Opportunity

Avenue Code is the leading software consultancy focused on delivering end-to-end development solutions for digital transformation across every vertical. We’re privately held, profitable, and have been on a solid growth trajectory since day one. We care deeply about our clients, our partners, and our people. We prefer the word ‘partner’ over ‘vendor’, and our investment in professional relationships is a reflection of that philosophy. We pride ourselves on our technical acumen, our collaborative problem-solving ability, and the warm professionalism of our teams.

Avenue Code is the leading software consultancy focused on delivering end-to-end development solutions for digital transformation across every vertical. We’re privately held, profitable, and have been on a solid growth trajectory since day one. We care deeply about our clients, our partners, and our people. We prefer the word ‘partner’ over ‘vendor’, and our investment in professional relationships is a reflection of that philosophy. We pride ourselves on our technical acumen, our collaborative problem-solving ability, and the warm professionalism of our teams.

Avenue Code has been believing in and promoting plurality actions for over 10 years, understanding that recognizing differences and fostering a safe environment, employment opportunities, representation, and support are the best ways to promote an increasingly equitable culture.

We are looking for a Senior Full Stack Engineer to design, develop, and maintain secure, cloud-native applications focused on transaction processing platforms. This role will work across frontend and backend development, building scalable portals, APIs, reporting solutions, and secure services that support business-critical financial operations.

The ideal candidate has strong experience with modern web technologies, backend development, API integrations, automated testing, and security best practices, especially in environments requiring compliance, secure data handling, and high availability.

Responsibilities

• Design and develop modern web applications, including customer and internal portals.
• Implement frontend and backend solutions using modern frameworks and programming languages.
• Build and maintain RESTful APIs and transaction processing services.
• Develop reporting modules and data-driven application features.
• Participate in CI/CD pipeline implementation and continuous delivery practices.
• Support application security initiatives, including vulnerability remediation and secure coding practices.
• Collaborate with cross-functional teams to deliver scalable and reliable cloud-native solutions.
• Contribute to architecture decisions, code reviews, testing strategies, and technical improvements.

Required Qualifications

• Strong experience with React and Next.js for frontend development.
• Experience with Node.js or equivalent backend technologies (Java, .NET, or similar).
• Solid understanding of REST APIs and backend service development.
• Experience working with SQL databases and data modeling.
• Hands-on experience with containerization technologies (Docker/Kubernetes).
• Proficiency with Git workflows and modern software development practices.
• Experience building and deploying cloud-native applications.
• Strong knowledge of automated testing practices and frameworks.

Nice To Have Skills

• Experience developing applications compliant with PCI-DSS standards.
• Knowledge of tokenization, encryption, and secure payment/card-data handling practices.
• Experience implementing Multi-Factor Authentication (MFA) and Role-Based Access Control (RBAC).
• Background working with transaction processing platforms or financial systems.
• Experience integrating systems through SFTP and secure data exchange protocols.
• Familiarity with CI/CD pipelines and DevOps practices.
• Knowledge of OWASP security controls and secure application development.
• Experience with load testing, performance optimization, and coordinating penetration testing activities.
• Experience with Infrastructure-as-Code (Terraform or similar tools).
• Understanding of audit logging, monitoring, observability, and operational excellence practices.

Avenue Code reinforces its commitment to privacy and to all the principles guaranteed by the most accurate global data protection laws, such as GDPR, LGPD, CCPA and CPRA. The Candidate data shared with Avenue Code will be kept confidential and will not be transmitted to disinterested third parties, nor will it be used for purposes other than the application for open positions. As a Consultancy company, Avenue Code may share your information with its clients and other Companies from the AI/R Group to which Avenue Code’s consultants are allocated to perform its services.