10/24/2025 updated

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Senior Full-stack Software Engineer

Copenhagen, Denmark BSc in Computer Science
Copenhagen, Denmark BSc in Computer Science

Profile attachments

Renato_Barontini_CV_15-Sep-2025.pdf

About me

Senior Full Stack Engineer with 20+ years’ experience in web and cloud development. Expert in React, Next.js, Node.js, AWS, and Kubernetes. I help businesses modernize platforms, build scalable apps, and deliver secure, future-proof solutions. From start-ups to enterprises, I craft digital products.

JavaScript (Programming Language)Application Programming Interfaces (APIs)Agile MethodologyArtificial IntelligenceAmazon Web ServicesAmazon S3AutomationTelecommunicationsServicio al ClienteCloud ComputingComputer ProgrammingDatabasesContinuous IntegrationCryptographyDevOpsAmazon DynamoDBFinanceGithubInfrastructure ManagementPython (Programming Language)PostgreSQLMongoDBMySQLNode.JsOracle ApplicationsScrum MethodologyNext.jsReproducibilityTypeScriptReactJSLarge Language ModelsCypress (Programming Language)Amazon Virtual Private Cloud (VPC)BackendGitlabCloudformationVue.jsKanbanAmazon Relational Database ServiceAngularJSKubernetesCoaching and MentoringBitbucketData ManagementReact NativeFront End Software DevelopmentRoute53TerraformDockerLegacy SystemsMicroservices
Skills & Expertise
I am a Senior Full Stack Engineer with 20+ years of experience delivering secure, scalable, and user-friendly digital solutions. My strength lies in owning the full development lifecycle — from frontend and backend to databases, cloud infrastructure, and DevOps — helping clients bring ideas to life quickly and reliably.

Core Programming & Development
I specialize in JavaScript/TypeScript, with strong expertise in React, Next.js, Angular, Vue, and Node.js. I design clean, responsive frontends and robust backends, delivering applications that scale. I also develop cross-platform apps with React Native, enabling cost-effective mobile solutions. My skills in Python and Go add flexibility for automation, infrastructure, and high-performance services.

Cloud Infrastructure & DevOps
I architect and maintain cloud-native systems on AWS (ECS, RDS, DynamoDB, S3, Lambda, Route 53, VPC, CDK, CloudFormation) and GCP (Kubernetes, Helm). With Docker, Docker Compose, and Terraform, I build reproducible, version-controlled environments. Clients benefit from infrastructure that is secure, cost-efficient, and built for growth.

Databases & Data Management
I have deep experience with PostgreSQL, MySQL, MongoDB, DynamoDB, and Oracle, handling schema design, migrations, encryption, and optimization. I ensure applications manage data securely and perform at scale.

Methodologies & Delivery
I apply Agile, Scrum, and Kanban practices to deliver predictably. A strong believer in TDD, I use Jest and Cypress to minimize bugs. I design CI/CD pipelines in GitHub Actions, GitLab, and Bitbucket, ensuring smooth, automated deployments. I also provide clear documentation and handover, so clients are never dependent on a single developer.

Systems & Modernization
I help businesses migrate legacy systems, refactor monoliths into microservices, and upgrade outdated frontends to modern stacks. I’ve integrated AI and LLM APIs, enabling clients to adopt cutting-edge technology while ensuring continuity and reliability.

Collaboration & Mentorship
Beyond coding, I thrive in international teams and enjoy mentoring juniors, uplifting overall team productivity and culture. Clients gain not just delivery, but a partner who strengthens their team.

Additional Strengths
I have worked across industries including finance, AI, compliance, telecom, and real estate analytics, adapting to diverse domains. With a keen eye on business goals and emerging technologies, I align development with long-term client success.

In short, I provide end-to-end expertise: from frontend and backend development to cloud, data, and DevOps. Clients who work with me gain a reliable partner capable of delivering future-proof, scalable solutions tailored to their needs.

Languages

EnglishFluentItalianNative speaker

Project history

Senior Full-Stack Developer

SafeguardGlobal

Other

250-500 team member

Three months contract 40 hrs/week to help removing legacy code of another business unit and in the process modernizing the stack from a fully EC2 hosted into an ECS cluster.

Delivered an interim AWS “legacy” environment in Terraform to maintain business continuity

Rebuilt the platform in AWS ECS using AWS CDK (Golang) for fully versioned Infrastructure as Code (IaC) establishing, in the process, a repeatable CDK patterns/constructs, enabling rapid provisioning and consistent guardrails across environments.

Dockerized the React frontend with Nginx as a reverse proxy; routed /api traffic to the apiserver via an internal NLB

Removed legacy code paths from the React frontend and apiserver alongside creating DB migrations to remove entries that associated the two.

Documented the AWS architecture in Miro and handover runbooks in Confluence; enabling the team to self‑serve deployments and environment creation.

Senior Full-Stack Engineer

Octofy

Internet & IT

< 10 team member

Collaborating with an AI start-up 10-15 hrs/week in my spare time in the development of the octofy.ai platform for the integration of various LLMs.

Frontend development in Next.js (React) for the web application.

Mobile development in React Native using Expo for the mobile application.

Maintain infrastructure in Docker Compose and CI/CD pipeline via github actions.

Implemented feature to encrypt customer's chat in a PostgreSQL DB table.

Designed and implemented a feature to rank models to suggest in auto-selection.

Designed and implemented a feature to allow customers to use their own LLM API keys.

Consulting on web development best practices and coaching younger developers.

Full-stack Engineer

Ubiqisense

10-50 team member

Full-stack Engineer on Ubiqisense analytics platform performing tasks of maintenance and feature enhancement in AngularJS, Node.js, MongoDB, AWS Lambda functions all running on AWS infrastructure.
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