Product Engineer (Staff/Principal)

Fifth Dimension AI

8d•$100,000 - $160,000

About The Position

Fifth Dimension is bringing vibe working to document-heavy industries 🌈. Today we work with real estate businesses in the US, EU and APAC, automating complex tasks, extracting valuable insights from documents, and empowering professionals to focus on high-impact work. Our AI workspace transforms how large investment managers and developers handle leases, development documents, and investment decisions. We're a London and New York based startup with an ample runway, backed by Tier 1 European and American investors. Our founders, Johnny Morris and Dr. Kate Jarvis bring a powerful blend of expertise (and spice 🌶️): Johnny has 17+ years applying data and analytics to Real Estate, while Kate holds a Stanford PhD and 12 years of executive experience across Silicon Valley and London startups. At Fifth Dimension, we're demanding yet encouraging, valuing experimentation and kind challenges. Our company values, Own It, Ship It, and Don't Be Boring, drive us to deliver exceptional results while fostering a culture of innovation and continuous improvement. The Challenge It's 9 AM on a Monday. You're reviewing usage analytics from last week's release and notice a drop-off in a key workflow—you sketch out a hypothesis and a fix before standup. By noon, you've shipped a prototype using Claude Code that rethinks how users navigate large document sets, and you're demoing it to a product manager and a customer success lead. By Wednesday, you're on a call with a major real estate firm, listening to how they actually use the platform day-to-day—and you spot an opportunity nobody had articulated yet. By Thursday, you've shaped that insight into a spec, got buy-in, and started building. By Friday, you're celebrating with the team as a customer tells you: "This is exactly what we needed." About You You're an expert software engineer who thinks in terms of user outcomes, not just code. You don't just ship features—you understand the problem space deeply, make sharp product calls, and build solutions that customers didn't know they needed until they can't live without them. You've honed your craft through years of practice across the full stack, from performant backends and well-designed APIs to responsive, polished frontends. You have strong product intuition—you know how to talk to customers, read between the lines of a feature request, and make pragmatic trade-offs between scope, speed, and quality. You're proficient with AI coding assistance tools like Claude Code, leveraging them to accelerate development and focus on higher-level product and architectural challenges. You understand that modern engineering means effectively collaborating with AI to maximise your productivity and creative potential. Details don't escape you. You take pride in the end-to-end user experience—from the API contract to the loading state to the edge case that only one customer hits. As someone who thrives in fast-paced environments, you adapt quickly and mentor other engineers while collaborating effectively with commercial teams and customers. You're passionate about your personal growth and see each complex problem as an opportunity to expand your capabilities. You actively seek challenges that push the boundaries of what's possible and value environments where you can both contribute your expertise and continue to evolve as an engineer. Your Impact Reporting to our CTO Chen, you'll own and shape core product areas end-to-end—from discovery and design through to architecture, implementation, deployment, and customer adoption. Working closely with our skilled engineering team and commercial stakeholders, you'll combine deep technical ability with strong product sense to build capabilities that deliver tangible value to enterprise customers and drive the business forward.

Requirements

Experience in high-growth startups or fast-paced tech environments
Track record building software in organizations with excellent engineering practices
History of owning end-to-end product development, from discovery and definition to delivery and customer adoption
Demonstrated product instinct—you've shaped what gets built, not just how it gets built
Strong Python skills with a track record of shipping customer-facing features on critical paths
Experience designing and building high-quality APIs, services, and distributed systems
Solid frontend skills and experience building polished, user-facing applications
Proficiency with AI coding assistance tools (Cursor, GitHub Copilot, Claude Code)
Intellectual curiosity and honesty—digging deep into problems and sharing findings openly
Proven ability to make technical decisions that balance immediate user needs with long-term architecture
Exceptional communication abilities for explaining complex concepts to diverse audiences
Ambition and resilience—we're a seed-stage company tackling ambitious challenges
Commercial awareness—delivering continuous value to customers is essential
Passion for personal growth and continuous learning

Nice To Haves

Experience with cloud infrastructure (GCP, AWS, or Azure) and container orchestration
Past experience in real estate, law, or finance
Background with robust software testing and deployment practices
Experience with component-based system design and microservices
Experience with event-driven architectures and streaming systems
Contributions to open-source projects or broader technical communities

Responsibilities

Think like a Product Manager+: Own core product areas while balancing technical excellence with business impact—you don't wait for a spec, you help write it
Own end-to-end delivery of complex features from discovery and definition through to production deployment and customer adoption
Talk to customers regularly—understanding their workflows, pain points, and unarticulated needs to inform what you build
Collaborate with product, design, and commercial teams to shape the roadmap and translate customer insight into robust technical solutions
Leverage AI coding tools like Claude Code to accelerate development workflows
Lead development of the systems that underpin our platform: Scalable APIs and backend services that power document processing, data extraction, and agentic workflows
Reliable streaming and event-driven architectures for real-time user experiences
Frontend experiences that make powerful AI capabilities intuitive and accessible
Integrations with enterprise systems and third-party platforms
Implement data privacy and security by design
Champion engineering best practices: testing, observability, CI/CD, and infrastructure-as-code
Mentor other engineers and help establish engineering and product-thinking best practices
Invest in your own growth by taking on ambitious technical challenges and expanding your expertise
Apply our engineering philosophy: intellectual honesty, effective time management, clear communication, and innovation

Benefits

£100,000-160,000 salary per annum + meaningful equity (on a standard vesting schedule) 📈
Enhanced Pension Contributions - 5%
Unlimited annual leave
£100 monthly well-being budget
Tailored support for exceptional challenges. This looks different for everyone, but can include contributions to: Gender-affirming care Private specialist and scans for an injury ADHD / Autism diagnosis IVF Therapy
Enhanced Parental Leave 14 weeks full pay (followed by standard statutory pay) for primary caregiver 6 weeks full pay for secondary caregiver
Electric Car Scheme (salary sacrifice)
£1000 annual training budget

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