At a Glance
- Tasks: Lead the frontend development of an innovative AI knowledge assistant for enterprise customers.
- Company: Join Complexio, a forward-thinking tech company revolutionising maritime operations.
- Benefits: Enjoy competitive salary, flexible work environment, and opportunities for professional growth.
- Other info: Flat organisational structure with direct communication and ownership over your work.
- Why this job: Shape the future of enterprise AI UX and make a real impact on product direction.
- Qualifications: 5+ years of frontend experience with strong product sense and real-time UI expertise.
The predicted salary is between 48000 - 72000 £ per year.
Complexio is building Stevie — an enterprise AI knowledge assistant that gives executives and operators a complete view of their organization through knowledge graphs. Our customers are large maritime shipping companies managing hundreds of vessels, thousands of daily emails, and complex commercial operations.
We're looking for a Senior or Lead Frontend Engineer to own Stevie's frontend. The interface is the product — it determines whether enterprise customers trust the intelligence, get value quickly, and come back. You'll shape all of that.
Why This Role
Enterprise AI UX is unsolved. You won't copy patterns — you'll create them. Citations from knowledge graphs, streaming AI responses that feel trustworthy, confidence indicators on operational intelligence.
You own the full frontend. No separate frontend team. You are it — with real influence on product direction and architectural decisions. Flat org, real impact. Domain owners have authority. Engineering decisions are made by engineers, not managers.
You'll own the full frontend — conversational AI interfaces, content feeds, document generation, collaborative features. The product is evolving fast and you'll shape what gets built and how.
Requirements
Must‐Haves
- 5+ years of frontend experience in production. You understand rendering models, performance characteristics, and architectural patterns deeply.
- Strong product sense. You push back when the UX doesn't make sense. You've shipped real user-facing products.
- Real-time/streaming UI experience. WebSockets, SSE, or similar live data patterns.
- Comfort with ambiguity. You take vague problems and turn them into concrete frontend solutions.
- You ship. End-to-end — prototype to production to iteration on feedback.
Strong Signals
- Enterprise/B2B SaaS. You know the difference between consumer UX and building for a CFO who needs to trust a number.
- AI product experience. Latency UX, citation rendering, hallucination presentation.
- Design sensibility. Polished interfaces without a designer in the room.
- Backend literacy. You can read a REST API and collaborate with backend engineers on data contracts.
- Startup experience. Small teams, multiple hats, fast without cutting corners.
How We Work
- Direct communication. Honest feedback, hard questions, no hiding behind process.
- Ownership over tasks. You're asked what you shipped and learned, not to fill out status reports.
- Speed with quality. We ship fast because we scope well. Customer feedback cycles are weeks, not quarters.
- AI-augmented workflow. We use AI tools extensively and expect you to be comfortable with AI-assisted development.
Lead Full-Stack Engineer in London employer: Complexio
Complexio is an exceptional employer for those looking to make a significant impact in the realm of enterprise AI. With a flat organisational structure, you will have direct influence over product direction and architectural decisions, fostering a culture of ownership and innovation. Located in a dynamic environment, we offer opportunities for professional growth, collaboration with talented individuals, and the chance to shape cutting-edge technology that transforms how maritime shipping companies operate.
StudySmarter Expert Advice🤫
We think this is how you could land Lead Full-Stack Engineer in London
✨Tip Number 1
Network like a pro! Reach out to folks in the industry, attend meetups, and connect with people on LinkedIn. You never know who might have the inside scoop on job openings or can refer you directly.
✨Tip Number 2
Show off your skills! Create a portfolio that highlights your best work, especially projects that demonstrate your frontend expertise. Make sure it’s easy to navigate and visually appealing—just like the interfaces you’ll be building!
✨Tip Number 3
Prepare for interviews by practising common technical questions and coding challenges. But don’t forget to brush up on your soft skills too—communication is key when you're owning the full frontend!
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen. Plus, we love seeing candidates who take the initiative to engage directly with us.
We think you need these skills to ace Lead Full-Stack Engineer in London
Some tips for your application 🫡
Show Off Your Frontend Skills:Make sure to highlight your 5+ years of frontend experience in your application. We want to see how you've tackled real user-facing products and your understanding of rendering models and performance characteristics.
Demonstrate Your Product Sense:When writing your application, share examples of how you've pushed back on UX decisions that didn't make sense. We love candidates who can think critically about product design and advocate for the best user experience.
Embrace Ambiguity:We’re looking for someone who can take vague problems and turn them into concrete solutions. In your application, give us a glimpse of how you've navigated uncertainty in past projects and delivered results.
Apply Through Our Website:Don’t forget to apply through our website! It’s the best way for us to keep track of your application and ensure it gets the attention it deserves. We can’t wait to see what you bring to the table!
How to prepare for a job interview at Complexio
✨Know Your Frontend Inside Out
Make sure you brush up on your frontend knowledge, especially around rendering models and performance characteristics. Be ready to discuss your past projects in detail, showcasing how you've tackled complex problems and delivered user-facing products.
✨Showcase Your Product Sense
Prepare to demonstrate your strong product sense during the interview. Think of examples where you pushed back on UX decisions that didn’t make sense and how you contributed to creating a polished interface without a designer. This will show that you understand the importance of user trust in enterprise applications.
✨Embrace Ambiguity
Expect to face vague problems during the interview. Practice articulating how you would turn these ambiguous challenges into concrete frontend solutions. Highlight your experience with real-time/streaming UI and how you’ve approached similar situations in the past.
✨Communicate Clearly and Confidently
Direct communication is key at Complexio. Be prepared to ask questions and provide honest feedback during the interview. Show that you can engage in meaningful discussions about engineering decisions and that you’re comfortable collaborating with backend engineers on data contracts.
