Senior Frontend Engineer – Greenfield Product (Angular)

Senior Frontend Engineer – Greenfield Product (Angular)

Freelance Contract | 9–12 months
Remote from Brazil

About the Project

Castle Tech GmbH is building a new standalone product from the ground up and is looking for an experienced Senior Frontend Engineer (Angular) to join us on a freelance basis for 9–12 months.

This is a high-impact engagement where you will influence system design, architecture, and product direction from day one. You will work closely with product and engineering to turn ideas into production-ready software while setting the foundation for how the system evolves.

If you enjoy building products from scratch, designing clean architectures, and taking ownership of meaningful projects, this contract will allow you to make a real impact.

What You'll Work On

Build a new production-grade product from the ground up

Design and implement a scalable frontend architecture using Angular and TypeScript

Take ownership of features from concept to deployment

Collaborate closely with product managers, designers, and backend engineers

Contribute to technical architecture and system design decisions

Help establish development standards, CI/CD pipelines, and engineering best practices

Mentor other engineers through code reviews and technical feedback

Continuously improve development workflows using modern tools and AI-assisted engineering

AI-Augmented Engineering

AI is part of how we work. We expect engineers to actively use modern AI tooling to improve productivity and quality.

You should be comfortable:

Using AI-assisted development tools in your daily workflow

Writing effective prompts and evaluating AI-generated output critically

Identifying AI limitations and failure modes

Exploring modern AI workflows and tools

This is not about blindly accepting AI suggestions — it's about using AI thoughtfully to work smarter and build better systems.

Your Skills

Must Have

5+ years of experience as a frontend engineer

Strong expertise with Angular (v11+) and TypeScript

Experience designing scalable frontend architectures

Strong understanding of software design principles and maintainable systems

Experience with modern frontend tooling (NPM, Webpack or esbuild)

Experience working with Git, CI/CD pipelines, and Docker

Experience working in agile teams (Scrum or Kanban)

Strong communication skills in English (written and verbal)

Availability for 9–12 months, starting as soon as possible

Comfortable working remotely with European time zone overlap (able to attend meetings during CET/CEST business hours)

Nice to Have

Experience with frontend testing frameworks (Jest, Cypress, Playwright)

Experience building greenfield products or new platforms

Familiarity with AI-related components such as RAG or vector databases

Experience with Material Design or product-oriented UI development

Conversational German

Previous experience working with European clients or distributed teams

What You'll Own

As a Senior Engineer, you will play an important role in shaping both the technology and the team.

You will:

Design systems with clear component boundaries and scalability in mind

Identify technical risks and propose practical solutions

Help improve the team's engineering standards and productivity

Mentor other engineers and contribute to technical decision-making

Deliver high-impact features that support business and product goals

Contract Details

Duration: 9–12 months (with potential for extension)

Location: Remote from Brazil

Start date: ASAP

Engagement type: Freelance / Contract (B2B or international contractor agreement)

Work arrangement: Fully remote with expected overlap during European business hours (CET/CEST)

Time zone: Flexible, with core collaboration hours aligned to Central European Time

Why Work With Castle Tech?

Build something new – work on a greenfield product from the start

Real technical ownership – influence architecture and system design

Modern engineering environment – use the latest tools and workflows

Collaborative team – work with experienced engineers, product managers, and designers

Remote-first mindset – async-friendly culture with clear communication practices

International exposure – work with a European tech company from Brazil