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Professional Portfolio from Singular Tech

Web and Mobile development

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Projects

Explore our web and mobile development projects.

Movie Manager

A CRUD of movies.

Bowling Lanes API

Robust API for bowling alley management.

A person holds a smartphone displaying various colorful app icons, placed in front of a laptop screen showing a code editor with lines of code. The setting appears dimly lit, suggesting a focus on technology and coding.A person holds a smartphone displaying various colorful app icons, placed in front of a laptop screen showing a code editor with lines of code. The setting appears dimly lit, suggesting a focus on technology and coding.
A person wearing a smartwatch types on a laptop with a website about web development displayed on the screen. The background includes a bookshelf with some books and a decorative horse sculpture.A person wearing a smartwatch types on a laptop with a website about web development displayed on the screen. The background includes a bookshelf with some books and a decorative horse sculpture.
Portfolio

Gallery of projects developed with excellence.

Services

Development of personalized web and mobile solutions.

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Professional Experience

Chief Technology Officer (CTO) | Railine Oliveira Advocacia | Jan 2025 – Present

I lead and oversee all technology, programming, and automation initiatives. My focus is the digital transformation of the legal sector by creating custom software solutions to optimize workflows, manage processes, and automate repetitive tasks. My responsibilities include defining the tech vision, using Node.js, TypeScript, and MongoDB for backend development, implementing DevOpspractices, and ensuring data security and compliance (LGPD). I also gained experience with Flutter for mobile application development.

Backend Software Engineer | QueroDelivery | Jun 2024 – Jul 2025

I built an API ecosystem from the ground up to generate strategic metrics, such as evaluation reports and order trends, which improved data-driven decision-making. I led the refactoring of a legacy API, applying Clean Code and SOLID principles to enhance reliability. I assisted in the migration from a monolithic system to a microservices architecture and implemented Kafka-based communication to ensure greater resilience and scalability.

Projects

Web and Mobile Development

Specialized in Node.js, TypeScript, MongoDB and Flutter, we deliver quality results.

A smartphone is displayed on a black stand, showing an app with the text 'Transforming Ideas into Reality'. Behind the phone, there are blurred green plants. To the left, a white mug with 'webflow' written on it is placed. The scene is set against a dark surface, and there is a checkered board partially visible.
A smartphone is displayed on a black stand, showing an app with the text 'Transforming Ideas into Reality'. Behind the phone, there are blurred green plants. To the left, a white mug with 'webflow' written on it is placed. The scene is set against a dark surface, and there is a checkered board partially visible.
Our Services

Experience. With our intuitive design and user-friendly interface, your website will captivate visitors.

Our Services

A laptop displaying a website design with the phrase 'Build your dream website.' next to a minimalistic building image. The scene also includes a modern mug and a smartphone placed on a wooden desk.
A laptop displaying a website design with the phrase 'Build your dream website.' next to a minimalistic building image. The scene also includes a modern mug and a smartphone placed on a wooden desk.
A close-up view of a computer screen displaying HTML or web development code. The text is colored with syntax highlighting, including blue and orange. On the left side, there is a blurry section showing what seems to be a user interface with partially visible text. The overall scene suggests a focus on coding or software development work.
A close-up view of a computer screen displaying HTML or web development code. The text is colored with syntax highlighting, including blue and orange. On the left side, there is a blurry section showing what seems to be a user interface with partially visible text. The overall scene suggests a focus on coding or software development work.
Web Development

We create responsive and functional websites that meet the specific needs of your business.

APIs and Integration

We develop robust APIs and integrations to optimize communication between systems and applications.

Contact

A laptop sits on a gray fabric couch, displaying code on its screen. Next to it, a smartphone lies flat. The code appears to be written in HTML or a similar programming language.
A laptop sits on a gray fabric couch, displaying code on its screen. Next to it, a smartphone lies flat. The code appears to be written in HTML or a similar programming language.

Get in touch to discuss your web or mobile development project. We are here to help!

contact:

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jamescosjr2@icloud.com

+55 79 99628-9020

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