Senior Frontend Engineer (Angular) – Greenfield Product

Castle Tech GmbH – Berlin or Munich (Hybrid)

We are building a new standalone product from the ground up and are looking for a Senior Frontend Engineer to help shape it.

This is a high-impact role 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 role 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

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

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

Why Join 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

• Flexible hybrid work – office and remote options in Berlin or Munich

• Your gear, your choice – MacBook or Windows setup with the tools you need

• Growth and development – structured onboarding, feedback cycles, and coaching

• Collaborative team – ambitious engineers who enjoy building great products

If you're excited about building a new product, shaping architecture, and working with a modern engineering team, we’d love to hear from you.

At JetBrains, code is our passion. Ever since we started in 2000, we have strived to make the strongest, most effective developer tools on earth. Our tools speed up production by automating routine checks and corrections, freeing developers to grow, discover, and create.

We are looking for a talented Full Stack Engineer to join our team and help build an innovative agentic-driven product. In this role, you’ll work across the entire stack – frontend, backend, and cloud infrastructure – designing, developing, and maintaining high-quality features. You’ll collaborate closely with product managers, designers, fellow engineers and AI-agents to deliver scalable, reliable, and user-friendly solutions.

Our tech stack:

• Primary: TypeScript, Node.JS, Nest.JS, React, Vitest (no legacy tech)
• Secondary: Kotlin/Java (for some backend services)

In this role, you will: 

• Design, develop, and maintain end-to-end features across the frontend and backend.
• Collaborate with product and design teams to translate user needs into technical solutions.
• Write clean, efficient, and well-documented code.
• Integrate our product with internal and external APIs and services.
• Contribute to architecture decisions, scalability, and performance improvements.
• Participate in code reviews to ensure quality and best practices.
• Debug, troubleshoot, and resolve issues quickly.
• Optimize applications for speed, usability, and scalability.
• Stay up to date with emerging technologies, tools, and industry trends.
• Continuously improve development processes and practices.

We will be happy to have you on our team if you have: 

• 6+ years of proven experience as a Full Stack Engineer or in a similar role.
• Solid engineering and architecture skills and ability to build reliable solutions.
• Focus on customer-oriented delivery and understanding of user needs and requirements.
• Deep understanding of backend & frontend development.
• Proficiency in multiple programming languages (e.g. TypeScript, Kotlin, Java, Python).
• Experience with relational and/or NoSQL databases (e.g. PostgreSQL, MongoDB, and MySQL).
• Understanding of cloud platforms (e.g. AWS, GCP, or Azure) and containerization (Docker or Kubernetes).
• Proficiency with version control systems (e.g. Git).
• Experience with testing frameworks (e.g. Jest, Vitest, and Playwright).
• Familiarity with authentication, authorization, and security best practices.
• Experience with AI agent development
• Strong problem-solving skills and attention to detail.
• Excellent communication and collaboration abilities.
• A bachelor’s degree in computer science or engineering (or equivalent practical experience).

Why join JetBrains?

• Strong base salary. We offer competitive pay that reflects your skills and experience.
• Flexible work location. Enjoy the freedom to work from home or from the office.
• Remote work. Spend up to 30 days per year working remotely from abroad.
• Extra time off. More days to relax, recharge, and do the things you love.
• Medical insurance allowance. Enjoy peace of mind for you and your family.
• Learning and development opportunities. Access to conferences, courses, and language classes.
• Relocation support. We help make your move as smooth and stress-free as possible.
• Language classes. Pick up the local language or sharpen your English skills.
• Fuel your day. Enjoy a hot meal or receive a lunch allowance on workdays.
• Mental health support. To help you feel your best, we provide easy access to professional mental health services.
• Sports benefit. Enjoy an on-site gym or sports club stipend.
• Internal events. Join company-wide celebrations and team gatherings.
  *Some benefits may vary depending on location.

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What you'll do

• Collaborating with Feature teams: You will work closely with our Feature teams, ensuring that the services align with the needs and requirements of our developers
• Driving improvements: You will continuously evaluate new technologies and processes, striving for enhancements, and implementing them as necessary to optimize our development practices
• Defining best practices: You will be responsible for defining best practices, known as "golden paths," for software development and deployment. This includes automation, testing, and security measures, in collaboration with our SREs, Security teams, and other domain experts
• Developing and maintaining tools and services: You will create and maintain tools and services that facilitate the implementation of best practices. These resources will assist developers in building and deploying applications more efficiently
• Ensuring reliability, scalability, traceability, and monitoring: You will play a vital role in ensuring the reliability, scalability, traceability, and monitoring of our services and infrastructure
• Collaborating on roadmap delivery: You will actively contribute to the delivery of roadmap items, working closely with the rest of the team to achieve our collective goals

Who you are

• You have at least 5+ years of site reliability engineering experience, including experience with AWS, Terraform, Kubernetes, GitHub Actions supporting applications deployment developed on the JVM and/or TypeScript
• You are proactive, curious, collaborative and eager to learn
• You have proven experience with cloud services such as AWS, Azure or Google Cloud
• You have a solid understanding of containerization and orchestration technologies (Docker and Kubernetes)
• You have proficiency in at least one programming language (Go, Java, Ruby, Python etc.) and a deep understanding of infrastructure as code principles

• Have experience with test frameworks such as Junit, Jest, Vitest, Playwright and/or Capybara and different test tools such as PACT for contract testing, Gatling for load testing
• Have experience with Datadog, Sonarqube and/or Backstage
• Have experience in managing a multi service environment
• Are opinionated about what the best developer experience looks like
• Consider Developers as your "customers"

What we offer

• Free Health Insurance for you
• Up to 14 days of RTT
• A flexible workplace policy offering both hybrid and office-based modes
• Flexibility days allowing to work in EU countries and the UK 10 days per year
• Wellbeing program with free mental health and coaching through moka.care
• Special support package for caregivers and workers with disabilities
• Lunch voucher with Swile card
• Work Council subsidy for sport club membership or creative activities
• Bicycle subsidy
• Public transportation reimbursement
• Relocation support for international mobility

Interview process

• Tech Recruiter interview
• Technical SRE interview
• System Design interview
• Behavioral interview
• Background / Reference check
• Offer!

Job details

• Contract: Permanent position
• Workplace: Paris 
• Start date: As soon as possible
• Remuneration: Competitive salary package according to your profile

We're building an AI copilot for web testing automation. It enables manual and automation QA engineers to turn their manual testing flows into production-ready automated E2E testing scripts, saving hours of manual work and coding. We are a small team with zero bureaucracy, focusing on real users. We optimize for shipping value - not hype.

About the role:

You'll own the top of the funnel: outbound, qualification, and getting leads to sit down for a conversation. Demos, onboarding, and retention are staying with the founder for now.

Phase one: Get individual Automation QAs to try the product, aiming for fast adoption and no procurement. Once we hit 20+ weekly users, we’ll move on to phase two, where we’ll shift the focus to B2B – qualified meetings with QA Leads and Engineering Managers.

Your focus in the first three months:

• Build targeted lists: Automation QAs at companies with web products and Playwright, Cypress, or Selenium in their stack.
• Run outbound sequences (LinkedIn is the baseline, but you decide the channels). A/B test weekly.
• Design qualification gates (forms and scoring) to filter leads before the founder calls.
• Reach 20+ weekly active users after month one – ICP-qualified and giving direct feedback to engineering.
• Document what works into a repeatable playbook.

Growth path:

This role expands as your strategies deliver results. Once the user pipeline works, you can take over demos and run B2B sales end to end. From there, the natural next step is Growth Lead (funnel optimization and scaling the playbook) or Account Executive (owning deal execution).

Why to join:

• You'll be building a strategy that scales the product, not filling a quota. What you create from scratch becomes the foundation.
• Your outreach turns into users who talk directly to engineering, and their feedback ships as features within days.
• AI for developer tools is a market with real pull, and QA automation is one of its sharpest pain points.
• We’re backed by JetBrains – financially secure with no reliance on external VC funding.

Who we're looking for:

You should have a high level of agency and be quant-minded – you live in funnel metrics, run experiments, and are comfortable saying "no" to leads that are a bad fit. 

The ideal candidate will:

• Have done 0-to-1 outbound for an early-stage devtool, QA tool, infrastructure product, or similar.
• Have proven cold outbound results, instead of being dependent on warm inbound.
• Be able to talk credibly about flaky tests, CI pain, and Playwright vs. Cypress. You don't need to be an engineer, but you do need domain empathy.
• Possess strong written communication skills, with the ability to craft short, sharp messages that get replies.

Nice to have:

• A QA or SDET background – you've felt the pain yourself before moving to sales or BD.
• Exposure to security/compliance objections – enough to pre-empt and route.
• Content skills – your LinkedIn posts get engagement, not just your DMs.
• Experience as one of the first 10 employees at a startup.

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