Fullstack Entwickler CardBasiX (m/w/d)

Help Build Europe's Hypersonic Capability
At
Hypersonica
, we’re redefining what’s possible in European defence technology. We exist to deliver speed, resilience, and technological independence at a pace that sets a new standard. We are a small, elite team working on problems that matter, and solving them fast.

By joining
Hypersonica
, you’re not stepping into a predefined role. You’re joining a talent dense environment where every individual shapes the direction of the company. Our philosophy is to hire a small number of exceptional people with broad, deep technical capability, strong judgement, and the ability to operate autonomously.

We hire for talent, not rigid boxes. This role represents a business need, but the way it evolves will be shaped by the individual. If you’ve achieved what others said was impossible, or you bring a unique combination of skills that doesn’t fit a traditional mould, we want to hear from you. The work you do here directly contributes to Europe’s technological independence.

Help Build Europe's Hypersonic Capability
At
Hypersonica
, we’re redefining what’s possible in European defence technology. We exist to deliver speed, resilience, and technological independence at a pace that sets a new standard. We are a small, elite team working on problems that matter, and solving them fast.

As our Ground Software Engineer you’re not stepping into a predefined role. You’re joining a talent dense environment where every individual shapes the direction of the company. Our philosophy is to hire a small number of exceptional people with broad, deep technical capability, strong judgement, and the ability to operate autonomously.

We hire for talent, not rigid boxes. This role represents a business need, but the way it evolves will be shaped by the individual. If you’ve achieved what others said was impossible, or you bring a unique combination of skills that doesn’t fit a traditional mould, we want to hear from you. The work you do here directly contributes to Europe’s technological independence.

What You'll Do

• Design and develop ground software used for mission preparation, execution, and monitoring of hypersonic systems.
• Build robust, user facing applications for Linux and Windows environments that support operators and engineers during real missions.
• Implement high performance C++ software with a focus on reliability, usability, and maintainability.
• Develop intuitive user interfaces and workflows to visualise system state, mission data, and operational status.
• Integrate ground software with simulation, test, and live system interfaces to support end to end operations.
• Work closely with systems, GNC, test, and operations teams to translate mission needs into effective software tools.
• Where useful, leverage UI frameworks (e.g. Qt) and mapping or visualisation SDKs to accelerate development.

Who You Are

• A software engineer with 3+ years’ experience building ground or operator-facing software in aerospace, defence, or complex technical domains.
• Comfortable developing user-facing applications on Linux and Windows, with an understanding of operational reliability.
• Fluent in modern C++, with an instinct for performance, robustness, and clean architecture.
• Someone who cares deeply about operator experience, clarity, and usability in high-pressure environments.
• Experienced translating mission and system needs into practical software tools, not just features.
• Pragmatic about tooling, with exposure to UI frameworks such as Qt and an interest in visualisation or mapping technologies.
• Able to move quickly in a startup environment, balancing polish with delivery speed.
• Motivated by building software that operators trust during real missions, not demo-only systems.

What We Offer

• A mission driven environment with the opportunity to work on one of Europe’s most consequential defence challenges, with direct impact on sovereign capability and security.
• Daily collaboration with top experts across engineering, operations, and defence, with real opportunity to learn from the best, contribute, and grow.
• High ownership and autonomy; no time tracking, no micromanagement, just clear objectives and accountability for outcomes.
• A fast paced environment where good ideas are implemented quickly, and feedback from test and flight drives real decisions.
• A culture that values clarity, integrity, and excellence, and supports people who take initiative and push boundaries responsibly.
• Competitive compensation and real share options aligned to responsibility and impact, not tenure or hierarchy.

At Hypersonica, every hire raises the bar. We are deliberately small, intensely capable, and deeply mission-driven. If this role feels like a strong fit, or if you believe you bring something exceptional that goes beyond the description, we encourage you to apply.

Hypersonica is an equal-opportunity employer and assesses candidates solely on merit, capability, and potential.

You can apply directly to this role or reach out to Nathan Sweeney, Head of Talent. We review every application and aim to respond to all candidates within two weeks, whether the answer is yes or no.

At Hypersonica, every hire raises the bar. We are deliberately small, intensely capable, and deeply mission-driven. If this role feels like a strong fit, or if you believe you bring something exceptional that goes beyond the description, we encourage you to apply.

Hypersonica is an equal-opportunity employer and assesses candidates solely on merit, capability, and potential.

You can apply directly to this role or reach out to Nathan Sweeney, Head of Talent. We review every application and aim to respond to all candidates within two weeks, whether the answer is yes or no.

We may use artificial intelligence (AI) tools to support parts of the hiring process, such as reviewing applications, analyzing resumes, or assessing responses and identifying potential inconsistencies or verification signals in application materials based on available information. These tools assist our recruitment team but do not replace human judgment. Final hiring decisions are ultimately made by humans. If you would like more information about how your data is processed, please contact us.

Who You'll Work With
Driving lasting impact and building long-term capabilities with our clients is not easy work. You are the kind of person who thrives in a high performance/high reward culture - doing hard things, picking yourself up when you stumble, and having the resilience to try another way forward.

In return for your drive, determination, and curiosity, we'll provide the resources, mentorship, and opportunities you need to become a stronger leader faster than you ever thought possible. Your colleagues—at all levels—will invest deeply in your development, just as much as they invest in delivering exceptional results for clients. Every day, you'll receive apprenticeship, coaching, and exposure that will accelerate your growth in ways you won’t find anywhere else.

When you join us, you will have:

• Continuous learning: Our learning and apprenticeship culture, backed by structured programs, is all about helping you grow while creating an environment where feedback is clear, actionable, and focused on your development. The real magic happens when you take the input from others to heart and embrace the fast-paced learning experience, owning your journey.
• A voice that matters: From day one, we value your ideas and contributions. You’ll make a tangible impact by offering innovative ideas and practical solutions, all while upholding our unwavering commitment to ethics and integrity. We not only encourage diverse perspectives, but they are critical in driving us toward the best possible outcomes.
• Global community: With colleagues across 65+ countries and over 100 different nationalities, our firm’s diversity fuels creativity and helps us come up with the best solutions for our clients. Plus, you’ll have the opportunity to learn from exceptional colleagues with diverse backgrounds and experiences.
• World-class benefits: On top of a competitive salary (based on your location, experience, and skills), we provide a comprehensive benefits package to enable holistic well-being for you and your family.

Your Impact
You will collaborate with a global network of technologists, designers, and strategists to help clients transform their businesses through innovative digital solutions.

You’ll develop cutting-edge products, mentor client teams, and shape engineering cultures while growing your expertise across diverse industries and technologies.

You will work hands-on with clients across industries to bring their digital ambitions to life. You will develop software products and services from the ground up while coaching and mentoring client teams on engineering best practices, user-centric design, and Agile values. By co-creating with clients and their leadership, you’ll help build not only cutting-edge products but also the technical capabilities and cultures needed to sustain them.

Your work will drive meaningful change for clients and their industries. You will participate in cross-functional problem-solving sessions with client leaders, shaping their digital strategies and delivering solutions that go beyond the product itself. Your efforts will help clients build scalable teams and engineering cultures that enable long-term success.

You will collaborate with clients across industries to turn their digital ambitions into reality through hands-on technical expertise. Based in one of our global locations, you will be part of QuantumBlack, AI by McKinsey, a multidisciplinary group of software engineers, AI engineers, data scientists, and technology consultant passionate about creating industry-shaping products and tools.

You’ll grow as a technologist and leader. You’ll work across diverse industries and technologies, learning something new with every project. With opportunities to contribute to digital strategies, build impactful products, and mentor others, you’ll have the freedom to chart your own path and grow in the areas that excite you most.

Your Qualifications and Skills

• Undergraduate or master’s degree; or equivalent experience
• 2+ years of experience developing full-stack applications by writing code that is readable, testable, maintainable, and scalable
• Demonstrated experience working collaboratively with other developers, as well as technical and non-technical people within software teams
• Hands-on experience and willingness to learn across frontend (TypeScript, React, Angular, Vue, Next.js, Tailwind), backend (Python, Node.js, Java/Spring, C#/.NET), and databases (SQL, NoSQL, vector databases, ETL)
• Experience with LLM frameworks, prompt orchestration, agent frameworks, MCPs, evaluation frameworks, and cloud platforms (Azure, AWS, GCP), including Docker and CI/CD
• Strong focus on automated testing, logging, monitoring, and overall system reliability
• Experience working in Agile teams, including active participation in sprint ceremonies
• Experience pair programming collaboratively with other developers
• Exceptional time management to meet your responsibilities in a complex and largely autonomous work environment
• Strong communication skills, both verbal and written in German and English, with the ability to adjust your style to suit different perspectives and seniority levels

OUR VISION
When people use our technology to "bridge the gap" between the physical and digital worlds, they don't just capture reality - they create a new one. In this new reality, they are smarter, more productive, more streamlined, and more creative - because they have the digital foundation to build the world they want to live in.

That's what NavVis offers in all our products and services: the tools to not just map the world as it is, but to pave the way to a better future. To forge something new. Physical or digital, there is only one reality. And it's the reality NavVis empowers people to build better.

THE OPPORTUNITY
Are you excited by the idea of building the technology behind immersive, browser-based 3D experiences at global scale?

We are looking for a
Full-Stack Software Engineer
to help advance our flagship product,
NavVis IVION,
a cutting-edge web platform for exploring and managing photorealistic digital twins directly in the browser.

In this role, you will design and implement key parts of our client–server architecture, working with technologies such as
Java, Spring, TypeScript, Angular, and PostgreSQL/PostGIS
. You'll collaborate closely with product, design, and fellow engineers to deliver scalable, reliable, and high-quality features that bring real-world spaces to life.

How You Will Make An Impact

• Design, implement, and maintain backend and frontend components of NavVis IVION, ensuring performance, reliability, and ease of use.
• Develop and extend our Java/Spring-based application server and Angular/TypeScript web client, powering 3D visualization, mapping, and data management features.
• Contribute to the evolution of our PostgreSQL/PostGIS data layer that stores and processes geospatial data at scale.
• Build and enhance APIs that enable digital enrichment of environments and integration with third-party systems.
• Collaborate with product managers, designers, and other engineers to translate user and business needs into robust technical solutions.
• Maintain high engineering standards through code reviews, testing, and performance optimizations.
• Support and mentor engineers with varying levels of experience within your squad, foster knowledge sharing, and encourage continuous improvement.

What Will Help You Succeed In The Role

• You bring 3+ years of experience in software engineering, with a track record of delivering complex systems.
• Expertise in Java, Spring, Hibernate, and modern web application architectures, as well as advanced frontend experience with Angular and TypeScript.
• Strong knowledge of relational databases (PostgreSQL/PostGIS) and building scalable, data-intensive services.
• Demonstrated ability to define technical roadmaps and drive consensus in cross-functional environments.
• Experience delivering APIs and SDKs, as well as gathering developer feedback to guide future improvements.
• Excellent communication and collaboration skills, with the ability to contribute and help shaping technical direction across teams and organizations

Bonus if you bring

• Working knowledge of C++
  is very welcome; while not our primary daily language, it is occasionally required for specific projects.
• Exposure to AWS Services, geospatial data, or 3D graphics/WebGL development.

How We Will Know We Are a Perfect Match
Your recruiting partner for this role is Johnny (He/Him). You can expect to go through a screening call, and up to 4 rounds of interviews, where we would love to discover your passion and interests, introduce you to who we are and what drives us, and finally understand how we can potentially add value to each other's growth.

How We Will Keep You Smiling

• It's important to take a break from work! We offer 30 days of paid time off per year
• Affordable access to a vast network of fitness and wellness facilities through EGYM Wellpass subsidy
• Deutschlandticket subsidy to support sustainable travel using public transport
• We offer flexible working hours and a hybrid work setup, enabling you to plan your work around your life, and not your life around work!
• We offer full visa and relocation support for international candidates
• An attractive bike leasing model through JobRad, in line with our commitment towards sustainable mobility
• A competitive compensation package that values the skills and experience you bring
• Up to 4000 EUR employee referral bonus
• Financial support for local language classes to help you in your journey of integrating into the culture!

About Us
NavVis is a technologically-focused, global leader in reality capture and digital factory solutions. Prominent manufacturers and laser scanning professionals around the world trust our ground-breaking technology, designed to capture and share the built environment as photorealistic digital twins. By bridging the physical and digital worlds, we're helping organizations make smarter decisions and build more efficient, connected operations.

With over 300 people from around 60 nationalities and offices around the globe, we're proud to be a truly international and diverse place to work. As a scaling company, we bring together the agility, innovation, and entrepreneurial mindset of a startup with the professionalism and reliability of an established enterprise — offering our team the best of both worlds.

You'll be part of an open culture that values trust, collaboration, and transparency. We are proud of our environment where diverse talent can thrive and where feedback fosters individual growth and development. Do you share our passion for disruptive technology and want to be part of our dynamic journey? At NavVis, you'll own your projects, bring innovative ideas to life, and have real opportunities to grow your career and be recognized for your impact.

We derive our strength from our diversity.
NavVis' unwavering commitment to fostering an inclusive and diverse workplace has laid the foundation for our incredible growth. We thrive on the collective strength of our people who come from diverse backgrounds. We respect and value every experience associated with race, gender identity, sexual orientation, nationality, religion and disability. We do not discriminate on the basis of any of these, or other identities, and strongly encourage everyone to apply.

Together with you, we build NavVis!
If you need assistance at any stage of the recruiting process due to a disability, please reach out to your recruiting partner(s) for this position.

About Babbel Labs
Babbel Labs is building the future of language learning. We're an AI-first, independent company within the Babbel group, based in Berlin. Our teams bring AI, R&D and product together to ship experiences that set a new standard for how people learn.

Your Learning Journey in This Role

Babbel is looking for a Senior iOS Engineer to help change the future of language learning within our Learning Experience teams.

This is an Individual Contributor role with team-level scope. You will work closely with product and engineering managers, designers, subject matter experts, and cross-platform engineers to build Babbel's core learning experiences — from the learning path and exercise player to real-time speaking and conversation practice.

You own the experience end to end: it ships as a distributable Swift package consumed by Babbel's main iOS app, and you follow it there — integration points, A/B experiments, rollout. And you'll do this the Labs way: AI coding agents are a first-class part of how we design, build, test, and review.

How You'll Make an Impact

• Take part in all product development phases: discovery, prototyping, proposing solutions, implementing, reviewing, testing, and deploying learning experiences.
• Own the engineering side of our feature workflow: shape the PRD together with product, then pick it up — write the technical spec, agree Interface Contracts with backend and partner teams, slice the backlog, and build.
• Build quick prototypes to de-risk product ideas — the learnings feed the product, even when the code doesn't.
• Design and evolve the public API of our Swift package with deliberate versioning and breaking-change discipline — and land it in the main app: integration points, A/B experiments, rollout.
• Collaborate closely with product managers, designers, and other cross-functional teams to define and implement features that enhance how learners progress through their learning path, exercises, and speaking practice.
• Maintain and proactively improve the technology stack, build system, and the AI-agent conventions (skills, project rules, documentation) the whole team relies on.
• Share what you learn: technical documentation for core features, and knowledge actively passed on to colleagues.

Your Skills And Qualifications

• 5+ years of experience building scalable iOS applications using Swift.
• An AI-first mindset — a strong must for us. You have actively embraced AI coding tools in your own work — not just autocomplete, but directing agents through real feature work and critically reviewing what they produce — and you treat prompts, skills, and project conventions as engineering artifacts maintained like code. Deep experience with our specific agent stack isn't required — demonstrated adoption and genuine enthusiasm are.
• Strong, up to date Swift — including Swift 6 strict concurrency (actors, Sendable, isolation) and structured concurrency.
• Deep SwiftUI experience and a solid grounding in the Apple ecosystem and Human Interface Guidelines; you think in state-driven UI and know where the framework's sharp edges are.
• Strong opinions on state management and testable architecture — experience unidirectional-data-flow architecture, and willingness to go deep on ours.
• Testing as a first-class habit: deterministic, exhaustive unit tests with controlled dependencies, snapshot tests where the UI is the contract — not coverage theater — and the CI/CD discipline to keep them green.
• Experience designing module boundaries, frameworks, or SDKs that other teams consume — ideally as distributable Swift packages — and the API-stability discipline that comes with it.
• Experience designing or consuming evolving JSON APIs and collaborating with contract-first backend teams.
• An eye for good architectural decisions based on feature requirements, and knowledge of how to balance technical debt against delivery speed.
• Comfort with ambiguity and fast iteration: directions evolve as we learn, and prototypes are a tool, not a deliverable.
• Clear, concise communication, an open mindset for feedback, and enjoyment in working closely with design and product in a lean environment.
• Fluency in written and spoken English.

Nice to Have

• Hands-on experience with The Composable Architecture and the Point-Free ecosystem (swift-dependencies, swift-sharing).
• Hands-on experience with agentic coding setups (e.g. Claude Code): agent skills, MCP servers, CLAUDE.md-style project conventions.
• Experience with Tuist or other project-as-code tooling at scale (modular workspaces, binary caching).
• Experience with Swift Testing (the modern successor to XCTest).
• Experience with real-time client features — live audio capture, streaming over WebSocket/WebRTC, low-latency interactions.
• Comfort navigating a legacy RxSwift/MVVM-C codebase — you'll help integrate our package into Babbel's main iOS app while it migrates to the new stack.
• Experience working in language learning, education technology, or consumer subscription products.

Ways of Working

Our stack: Swift 6.2 with strict concurrency, SwiftUI, The Composable Architecture with the Point-Free ecosystem (swift-dependencies, swift-sharing), Swift Testing with exhaustive state assertions, and project-as-code with Tuist (modular workspace, binary caching). We ship our features as a distributable Swift package built with multiple consumers in mind — today, Babbel's main iOS app. We work trunk-based with Conventional Commits driving automated versioning, plan in Linear (discovery → PRD → spec → issues), and build AI-first: coding agents, a curated skill library, and conventions good enough that even non-engineers on the team run and prototype in the app.

Success in this role is measured by the quality and impact of the learning experiences you ship, the health of the codebase and its public API, and the knowledge you share with your team and with iOS engineers across Babbel.

Diversity at Babbel

As part of our ongoing journey towards building a diverse, equitable, and inclusive company, we welcome everyone to apply, especially individuals who are underrepresented in tech. We are a learning company, inside and out, and we encourage you to apply even if you do not fit all the technical requirements — all candidates are assessed based on skills, qualifications, and our business needs. Please state your pronouns in your application, and let us know if you'd like to be addressed by a name other than the one appearing on your official documents. If you have a disability or special need, feel welcome to inform us so we can provide proper assistance in the application process.