Agustin Estiven

AGUSTIN ESTIVEN Senior Software Engineer Buenos Aires Province, Argentina -Linkedin: www.linkedin.com/in/agustinestiven-00954b384 Phone:- PROFESSIONAL SUMMARY Full Stack Software Engineer with 9 years of experience across Singapore and Argentina, delivering enterprise-grade solutions in E-commerce & Retail, AI platforms, healthcare, FinTech, , Social media and IOT platforms. Strong background with cloud-native architecture, microservices, several Databases(PostgreSQL, MySQL, MongDB), backend development (Node.js, Ruby on Rail, Django, FastAPI, Asp.net Core, NestJS), frontend development (React, Angular, Vue.js, Remix, Next.js) and DevOps practices. Also have strong expertise with Cloud(AWS, GCP, Azure). CORE SKILLS • • • • • • • • • • • Backend: JavaScript/TypeScript(Node.js, Express.js, NestJS), Ruby on Rail, Python (Django, FastAPI), C#(Asp.NET Core), Java (SpringBoot) Frontend: React, Angular, Vue.js, Next.js, Remix, Styling : Material UI, Bootstrap, Tailwind CSS, Ant Design Cloud & DevOps: GCP (GCS, GKE, Pub/Sub, BigQuery), Microsoft Azure (App Service, AKS, Functions), AWS (function, Lambda, AKE, API gateway), AI & ML: Machine Learning, OpenAL/LLMs integration, Google Maps API, ETL, VectorDB, PineCone Orchestration: Docker, Kubernetes, Terraform, Azure DevOps, GitHub Actions, Jenkins Data & Analytics: PostgreSQL, MySQL, MongoDB, AWS Lambda, ElasticSearch, Redis. ETL pipelines Monitoring Tools: Grafana, Datadog, New Relic, ELK Stack Testing & Quality: JUnit, Jest, PyTest, Mocha, test automation, CI/CD pipelines Security & Compliance: OAuth2, JWT, RBAC, SSO, data protection requirements for finance/health domains Collaboration: Agile/Scrum, code review culture, stakeholder communication, technical documentation, team mentoring PROFESSIONAL EXPERIENCE SENIOR SOFTWARE ENGINEER Cognizant, Teaneck, New Jersey, United State • • • • • • • • • • Led architecture and delivery of cloud-native enterprise applications on Azure and AWS, designing services and deployment patterns to reliably serve high-volume transaction loads and meet strict uptime SLAs. Managed end-to-end migrations from legacy on-prem platforms to cloud-hosted microservices, reducing infrastructure and licensing costs by ~30% while enabling more frequent release cadences. Architected resilient microservices in Java (Spring Boot) and Node.js, introduced circuit breakers, health checks and autoscaling policies to meet client performance targets under peak loads. Implemented enterprise-grade security controls—OAuth2/JWT authentication, RBAC, and encryption in transit/at rest—to align solutions with regulatory and client-specific compliance requirements. Reworked CI/CD processes with Azure DevOps and GitHub Actions to automate multi-environment deployments, increase deployment success rates above 95%, and reduce manual rollback events. Built near-real-time data ingestion and transformation pipelines that fed analytics dashboards used for operational decisions and SLA monitoring. Introduced a unified observability stack (Application Insights / Prometheus / Grafana / ELK) and standardized alerting, which reduced mean time to detection and resolution for critical incidents. Championed API design standards and API contract testing across teams, reducing integration defects and downstream regressions by measurable margins. Acted as technical lead in cross-regional Agile squads—facilitating sprint planning, grooming and stakeholder demos—ensuring delivery priorities aligned to client roadmaps. Mentored and onboarded junior engineers, ran internal brown-bag sessions on cloud best practices and microservices patterns, and improved team delivery velocity and code quality. FULL-STACK ENGINEER Globant, Buenos Aires, Argentina • • JUL 2022– AUG 2025 MAY 2019 – MAY 2022 Returned to Argentina to contribute to Globant’s enterprise modernization engagements, leading frontend and backend efforts for large telecom and finance clients. Migrated legacy monolithic applications to modular microservices and containerized deployments, improving fault isolation and enabling independent team releases. • • • • • • Designed and implemented high-throughput ETL pipelines capable of processing large datasets for operational reporting and analytics, enabling more timely business insights. Built modular component libraries in React and state-management patterns to standardize UI across products, shortening new feature delivery times for product teams. Introduced automated testing strategies (unit, integration, E2E) and CI pipelines (Jenkins, Azure DevOps) that reduced production defects and rollback frequency. Implemented observability and performance monitoring solutions (ELK, New Relic), significantly improving incident triage and reducing MTTR for high-severity incidents. Collaborated closely with UX teams to implement accessible, responsive interfaces with measurable improvements in user engagement metrics. Engaged with international client stakeholders to translate requirements into technical roadmaps, ensuring scalable architecture choices and on-time delivery. FULL STACK DEVELOPER HCLTech, Singapore • • • • • • • Developed enterprise-grade web applications for banking and telecom customers, delivering full-stack features using React.js, Next.js, Node.js, and Java Spring under tight SLA constraints. Created and maintained a shared UI component library to ensure consistent UX and accelerate feature implementation across distributed product teams. Optimized backend services for high-volume transaction processing, tuning database queries and introducing caching strategies to meet performance targets. Participated in hybrid cloud adoption projects—deploying workloads on Azure and AWS—helping clients to balance scaling needs with regulatory constraints. Implemented secure authentication and authorization frameworks (JWT, OAuth2, RBAC) aligned to enterprise security requirements and audit expectations. Containerized applications with Docker and deployed them to Kubernetes clusters, improving deployment reliability and enabling blue/green and rolling updates. Conducted peer code reviews, knowledge-transfer sessions, and technical design workshops with client teams to ensure maintainable and scalable implementations. JUNIOR ENGINEER Assure IT, Singapore • • • • • • JAN 2017 – APR 2019 SEP 2016 – JAN 2017 Contributed to front-end development for client websites and internal tools using JavaScript, jQuery and Bootstrap, delivering mobileresponsive components and interactive features. Assisted in refactoring legacy UI code into modular JavaScript components to improve maintainability and ease future migration to frameworks like React. Participated in unit and integration testing, identifying and resolving front-end defects early and contributing to a measurable drop in production issues. Produced technical documentation and release notes to support client handovers and reduce post-delivery support cycles. Wrote SQL queries and small automation scripts to support data clean-up and reporting tasks, saving manual effort for operations teams. Engaged in Agile team ceremonies (daily stand-ups, sprint planning, retrospectives) and collaborated closely with designers and senior engineers to deliver client value iteratively. CAREER HIGHLIGHTS • • • • • • • • • • • • Led enterprise cloud migrations at Cognizant, moving on-premise systems to AWS and Azure, cutting infrastructure/licensing costs by 30%. Architected resilient microservices in Java (Spring Boot) and Node.js with autoscaling and circuit breakers, ensuring stability under high transaction loads. Rebuilt CI/CD pipelines with Azure DevOps and GitHub Actions, raising deployment success rates above 95% and reducing rollback events. Designed near real-time data pipelines that fed analytics dashboards for SLA and operational decision-making. Introduced observability stack (App Insights, Prometheus, Grafana, ELK), significantly lowering mean-time-to-detection and resolution of incidents. Championed API design standards and contract testing, reducing integration defects and downstream regressions. Modernized legacy monoliths at Globant into containerized microservices, improving fault isolation and enabling faster releases. Built high-throughput ETL pipelines processing large datasets, delivering timely analytics and business insights.. Developed reusable React component libraries, cutting feature delivery times and improving UI consistency across enterprise apps. Enabled hybrid cloud adoption at HCLTech, deploying workloads across AWS and Azure to balance scalability with compliance requirements. Deployed secure authentication frameworks (OAuth2, JWT, RBAC) across multiple client projects to meet enterprise and regulatory standards. Mentored and onboarded engineers, running workshops and technical sessions that boosted delivery velocity and team capability. EDUCATION Nanyang Technological University (NTU), Singapore Bachelor of Science — Computer Science | Jun 2012 – Aug 2016 LANGUAGE • • • English — C1 (professional fluency) Spanish — B1 (intermediate) Russian — B2 (intermediate / professional collaboration)