Senior Front-end Engineer

Avenga; Argentina; Hybrid; ARS 1,800,000 - 3,000,000; Full time

Job summary

Avenga, an international engineering firm, is hiring a Senior Front-end Engineer in Argentina (Buenos Aires preferred) to lead a strategic financial-services project. You will work across the full software lifecycle, from discovery to deployment, building cloud-native solutions and collaborating with product and technology stakeholders.

You will craft modern frontend experiences with React.js and Node.js, contribute to BFF services using Express.js or NestJS, and design scalable architectures in

Qualifications

• 5+ years of commercial experience with React.js and frontend practices.
• Hands-on Node.js experience (v18+), Express.js and/or NestJS.
• Experience with RESTful APIs and NoSQL databases.
• Cloud deployment and IaC familiarity; GitLab workflows.
• Fluent Spanish and intermediate English.

Responsibilities

• Design, develop, and maintain frontend with React.js emphasis.
• Build BFF services using Node.js, Express.js, and NestJS.
• Create intuitive, user-centric interfaces focused on usability and performance.
• Develop, integrate, and optimize RESTful APIs and backend services.
• Write unit tests and conduct code reviews to ensure quality.
• Maintain and enhance production applications with new features.
• Collaborate with Product Owners and stakeholders to translate requirements.
• Build prototypes during discovery and project scoping.
• Share knowledge to strengthen team practices and tech capabilities.
• Align technical initiatives with OKRs and business goals.

Skills

React.js

Node.js

Microservices

REST APIs

NoSQL

Cloud deployment

IaC

GitLab

Datadog

Opsgenie

Communication

Spanish

English

Express.js

NestJS

Tools

Express.js

NestJS

GitLab

Datadog

Opsgenie

AWS (Nice-to-have)

Job description

Avenga is an international engineering firm helping businesses operate with AI at the core. With 6,000+ experts worldwide, we combine engineering expertise with AI-native thinking to turn ambitious ideas into real-world impact across industries, technologies, and markets.

At the core of the role

In Argentina, we are looking for a Senior Front-end (React.js with Node.js experience) Engineer to lead a strategic financial-services project. You will work across the entire software development lifecycle, from technical discovery and solution design to implementation, testing, deployment, and production support. You will build modern cloud-native solutions, collaborate with product and technology stakeholders, and influence architectural decisions in an agile, innovation-driven environment. As part of the team, you will join a multidisciplinary squad composed of Software Engineers, Technical Leads, Product Owners, and UX specialists. This role is open to candidates in Argentina, preferably Buenos Aires, for occasional in-person collaboration.

Core Skills You’ll Bring

• 5+ years of commercial experience with React.js and modern frontend practices.
• Hands-on Node.js (v18+) experience, preferably with Express.js and/or NestJS.
• Solid understanding of microservices and/or event-driven architectures.
• Experience building and consuming RESTful APIs.
• Knowledge of NoSQL databases.
• Practical experience deploying and managing applications in cloud environments.
• Familiarity with Serverless Framework or other Infrastructure as Code (IaC) tools.
• Strong knowledge of GitLab, including branching strategies, feature development workflows, and hotfix processes.
• Experience with monitoring and alerting tools such as Datadog and Opsgenie.
• Excellent communication, collaboration, and stakeholder management skills.
• Native or fluent Spanish and Intermediate English proficiency.

Nice-to-have

• Experience with AWS cloud services, including AWS Lambda, API Gateway, SQS, SNS, Step Functions, EventBridge, DynamoDB.
• Familiarity with TypeScript.
• Experience with Agile methodologies and the full software development lifecycle.
• Ability to mentor teammates and share technical knowledge across teams.

The impact you'll create

• Design, develop, and maintain full-stack applications with a primary focus on creating exceptional frontend experiences using React.js.
• Build and enhance Backend-for-Frontend (BFF) services using Node.js, Express.js, and NestJS.
• Create intuitive, engaging, and user-centric interfaces with a strong emphasis on usability and performance.
• Develop, integrate, and optimize RESTful APIs and backend services.
• Write unit tests and ensure software quality through code reviews and best engineering practices.
• Maintain, troubleshoot, and enhance production applications while implementing new features and improvements.
• Collaborate with Product Owners, Technical Leads, and stakeholders to understand business requirements and translate them into technical solutions.
• Build prototypes and proofs of concept during discovery and project scoping phases.
• Share knowledge, lessons learned, and technical discoveries to strengthen team capabilities and technology practices.
• Align technical initiatives with team objectives, OKRs, and broader business goals.

People are at the core of Avenga. We provide equal opportunities regardless of race, ethnicity, gender identity, sexual orientation, disability, age, religion, or any other characteristic. We are committed to a respectful environment where everyone can be themselves, share their ideas, and feel that they belong.