Junior Back-End .NET Developer

FCamara Consulting & Training

. Develop REST APIs in Node.js (ESM) using a serverless architecture on AWS Lambda and API Gateway, including modular routing, JWT authentication, role-based authorization and data-scope controls, payload validation with Joi, and centralized error handling.

Posted 11/7/2026contractSão Paulo • BrazilJuniorWebsite

Core Competencies

Role fit

Core Competencies

Use this summary to align your resume positioning with the role.

Demonstrates expertise in developing REST APIs using Node.js and AWS serverless architecture, alongside proficiency in Flutter/Dart application development for web and mobile. Strong capabilities in authentication, authorization, and database management, with a focus on quality and scalability.

Highest-signal resume keywords

REST API Development in Node.jsAWS Serverless ArchitectureFlutter/Dart Application DevelopmentAuthentication and Authorization with JWT and OAuth2MySQL Database Management

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills

Node.jsAWS LambdaAPI GatewayFlutterDartPython 3.13MySQLGitHub ActionsAWS SAMCloudFormation

Soft Skills

Analytical SkillsProblem-Solving SkillsCommunication Skills

Tools & Technologies

Amazon S3Microsoft Entra IDJoiGitOAuth2

Industry Keywords

Serverless ArchitectureInfrastructure as CodeContinuous IntegrationContinuous DeploymentLegacy System Maintenance

Tech Stack

Tools & technologies

AWSAzureDartERPETLFlutterJavaScriptMySQLNode.jsPython

About the role

Key responsibilities & impact

Develop REST APIs in Node.js (ESM) using a serverless architecture on AWS Lambda and API Gateway, including modular routing, JWT authentication, role-based authorization and data-scope controls, payload validation with Joi, and centralized error handling.
Develop Flutter/Dart applications for web and mobile, with a custom router based on path parameters and query strings, an internal design system, and responsive layouts using breakpoints.
Implement corporate authentication with Microsoft Entra ID (Azure AD) via OAuth2, including automatic access-token renewal using refresh tokens, transparent request retries, and JavaScript ↔ Dart interoperability.
Develop serverless automations in Python 3.13 on AWS using AWS SAM/CloudFormation, arm64 Lambda functions, IAM roles with least-privilege permissions, integrations with Pipefy, Sankhya ERP, and email and benefits services, incremental ETL pipelines, and continuous deployment through GitHub Actions with OIDC authentication.
Implement attachment upload and download flows using Amazon S3 and presigned URLs, with separate implementations for web and mobile.
Integrate with AWS using SDK v3, including S3, Secrets Manager, and Lambda function invocation.
Model and access data in MySQL, including batch writes, soft deletes, pagination, composite indexes, and analytical queries.
Migrate a legacy data model to ERP tables, rewrite data-access layers, and revalidate more than 30 endpoints through automated response comparison.
Implement automated and end-to-end tests to validate integrations and critical workflows.
Generate reports and Excel exports from parameterized queries.
Maintain and reverse-engineer legacy code, analyze the impact of schema changes, manage API versioning, and conduct code reviews on GitHub.

Requirements

What you’ll need

Solid experience developing REST APIs in Node.js.
Experience with AWS serverless architecture, including Lambda, API Gateway, S3, and IAM.
Experience developing Flutter/Dart applications for web and mobile.
Experience with authentication and authorization using JWT, OAuth2, and Microsoft Entra ID (Azure AD).
Knowledge of MySQL databases and relational data modeling.
Experience integrating systems, APIs, and enterprise platforms.
Experience developing automations in Python.
Experience with AWS SAM, CloudFormation, and Infrastructure as Code (IaC).
Experience building CI/CD pipelines with GitHub Actions.
Knowledge of automated testing, including integration and end-to-end testing.
Experience with Git version control, pull requests, and code reviews.
Ability to maintain and enhance legacy systems.
Strong analytical and complex problem-solving skills.
Autonomy to conduct technical investigations and propose solutions.
Strong communication skills for collaborating with business stakeholders and cross-functional teams.
Product mindset and a consistent focus on quality, scalability, and user experience.

Benefits

Comp & perks

No specific benefits, perks, or additional compensation were provided for this position.