My Path

Hey there! I'm Sebastian Nielsen, I specialize in software solutions to bring your online world to life. My expertise is based on Backend Techs, APIs, and blockchain solutions, but as you can see, I can also design WEB's.

Backend and Blockchain Sorcerer 🌈
API's Maestro 🌀
Blockchain engineer 🔥

Education

Senior Technician in Programming UTN

Tech University, 2010 - 2014

I began my coding journey with a solid computer science education at Technological National University (UTN) Argentina, laying the foundation for navigating the ever-evolving tech landscape.

Key Skills & Technologies

Backend Development

Expert in designing RESTful APIs and microservices with Node.js frameworks. Skilled in creating middleware, route handling, and efficient request processing. Experience with serverless frameworks and event-driven architectures.

Node.js Express.js Koa.js Serverless Event-Driven Architectures

TypeScript & JavaScript (ES6+)

Profound knowledge of modern JavaScript features like async/await, destructuring, modules, and generators. Expertise in TypeScript for type safety, interfaces, generics, and integrating static typing into large codebases for maintainability and reduced bugs.

TypeScript JavaScript (ES6+) Async/Await Destructuring ES Modules Generators

API Design & Development

Designing scalable, versioned APIs with best practices for resource modeling. Proficient in implementing GraphQL endpoints for flexible client queries and defining comprehensive API documentation adhering to OpenAPI/Swagger standards.

RESTful APIs GraphQL OpenAPI Standards Swagger

Microservices & Cloud Infrastructure

Architecting and deploying loosely coupled services using Docker containers orchestrated by Kubernetes clusters. Managing cloud resources on AWS (EC2, Lambda, S3, RDS, CloudWatch) and Azure for scalability, robustness, and cost-efficiency.

Docker Kubernetes AWS Azure EC2 Lambda S3 RDS CloudWatch

Databases & Data Storage

Advanced querying and schema design for NoSQL and relational databases. Implementing replication, sharding, and indexing strategies. Using Redis for caching, session management, and pub/sub messaging to boost performance.

MongoDB PostgreSQL MySQL Redis NoSQL Relational Databases

Message Queues & Event Streaming

Building decoupled, scalable systems that leverage message brokers for asynchronous communication, event sourcing, and real-time data processing. Ensuring message durability, ordering, and fault tolerance.

RabbitMQ Kafka Redis Pub/Sub Message Brokers Event Sourcing

Testing & CI/CD

Creating comprehensive test suites including unit, integration, and end-to-end tests. Automating deployment pipelines with continuous integration and delivery practices to ensure reliable releases.

Jest Mocha Jenkins GitLab CI GitHub Actions Unit Testing Integration Testing End-to-End Testing CI/CD Pipelines

Security

Implementing secure authentication and authorization mechanisms, protecting sensitive data through encryption, and mitigating common vulnerabilities like XSS, CSRF, and injection attacks.

OAuth2 JWT Data Encryption OWASP Best Practices XSS CSRF Injection Attacks

Performance Optimization

Monitoring and profiling applications with tools such as Node.js built-in profiler, Clinic.js, or New Relic. Applying caching strategies, clustering Node.js processes, and load balancing to handle high traffic efficiently.

Load Balancing Caching Clustering Profiling Node.js Profiler Clinic.js New Relic

DevOps & Automation

Automating infrastructure provisioning with Terraform, managing container deployments, and setting up monitoring dashboards with Grafana and Prometheus for proactive system health tracking.

Docker Kubernetes Terraform Grafana Prometheus Automation

Version Control & Collaboration

Mastering Git workflows including feature branching, pull requests, and code reviews to facilitate team collaboration and maintain high code quality.

Git GitFlow Feature Branching Pull Requests Code Reviews

Other Skills

Includes expertise in various areas such as design patterns, code quality, and agile methodologies.

Singleton Factory Middleware Observer Maintainable Code API Documentation Coding Standards Agile Methodologies Sprints Stand-ups Retrospectives Iterative Development

Passion

Continuous Learning and Community Engagement

Passion for Continuous Learning - Beyond work, I stay current with the development community, fueling my passion for cutting-edge digital solutions.

'I bring real-world skills, dedication, and a genuine love for creating impactful digital experiences. Let's collaborate and turn your ideas into reality!' Sebastian Nielsen

Let's work together