(Senior) Full Stack Engineer – Apps (m/f/d)

Permanent employee, Full-time · Berlin (Remote)

Your Role

We’re looking for a Senior Full Stack Engineer (m/f/d) to build the products that put AI-powered revenue intelligence directly into the hands of sales teams. You’ll work across our entire stack, from React interfaces that make AI insights actionable to JVM-based backend services, owning features end to end and shipping product that sales teams rely on every day.

This is a hands-on role for someone who wants to work close to the product, take ownership of production systems, and build scalable software in a fast-moving, AI-first environment.

Your mission

Own features end to end: Take features from concept to production across frontend and backend, from user interface to database to deployed service
Build multi-surface solutions: Ship product improvements across our web app, mobile-optimized field sales solutions, and CRM integrations
Surface AI insights: Develop React applications that make complex, AI-generated revenue intelligence actionable for sales teams
Power the platform: Build and maintain backend services in Kotlin with Spring Boot that handle scale and complexity
Design great APIs: Create and evolve both GraphQL and REST APIs that serve our diverse product surfaces
Work with data: Design solutions using PostgreSQL for transactional data and ClickHouse for analytics
Own what you deploy: Take full responsibility for your services in production. You build it, you run it, you improve it
Shape our architecture: Participate in code reviews and technical discussions that influence our technical direction

Your profile: What you need to succeed

We care more about your ability to solve problems and ship product than a checklist of technologies. That said, here’s what success in this role looks like:

Experience: 5+ years of professional software engineering experience shipping production code
Frontend expertise: Strong TypeScript and React skills with real-world production experience
Backend foundation: Solid JVM experience (Java or Kotlin) and practical Spring Boot experience
API and data design: Proven experience with relational databases and thoughtful API design
Operational basics: Comfortable with Docker and Kubernetes fundamentals
High agency: You identify problems and solve them without waiting for direction, with a clear bias toward action
Product mindset: You think about user impact and business outcomes, not just technical elegance

Nice to Have

Experience integrating AI or ML capabilities into production products
Familiarity with analytics databases such as ClickHouse or BigQuery
Experience with gRPC and microservices patterns

Why Acto?

Development Opportunities: Steep development opportunities without entrenched hierarchies.
Culture: We are an ambitious team that wants to achieve a lot with Acto, but we don't take ourselves too seriously and like to have fun together, be it working together or at regular team events.
Flexibility: Berlin-based with flexible remote work. You can work from home often, with regular in-person time in our Berlin office, particularly for key meetings and collaboration.
Health and work-life balance: Enjoy 30 days of vacation and an attractive Wellhub membership.
Ownership: Whether you are an intern or a full-time acto-naut, Acto instills a deep sense of ownership, where every team member is entrusted with meaningful responsibilities and the autonomy to make impactful decisions.
Equipment: You will receive a state-of-the-art hardware setup with a choice between Mac and Windows.

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About us

At Acto, we’re building agentic AI systems that go beyond chat, systems that reason, act, and deliver results across complex real-world workflows for field sales teams.
Our mission is to turn enterprise data and tools into intelligent, decision-capable agents that support people where it matters: in meetings, in daily operations and on the road. We're a small, product-focused team combining deep experience in AI, ML engineering, and systems design.
We started in 2021 and since then have not only been able to win renown medium-sized companies as customers, but also bring experienced investors such as 468 Capital and Cusp Capital on board.

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Your application!

We appreciate your interest in acto GmbH. Please fill in the following short form. Should you have any difficulties in uploading your files, please contact us by mail at jobs@heyacto.com