Savva Lambin
Freelance Product Engineer
Services
MVP Development
Product Engineering
Technical Consultation
Research Tools
From idea to a working product that can be tested with real users.
I build MVPs that are ready to validate real user needs, attract early adopters, and support iteration. I focus on shipping the right features fast and iterating based on real user feedback, rather than over-engineering.
Example work includes:
- Translating product ideas into a clear technical plan
- Building full-stack MVPs using React, TypeScript, and Python
- Rapid iteration based on user feedback
- Deploying and maintaining early production systems
Best for early-stage startups and solo founders who need to turn an idea into something real.
Pricing
- £600–£750 per day
- £5,000–£7,000 per 2-week sprint
- Most MVPs take 2–4 sprints depending on scope
- Fixed-scope MVP projects available from £12,000
How projects are scoped
- We start with a short discovery conversation to clarify the problem and desired outcome.
- A lightweight technical plan defines the initial MVP scope and priorities.
- Each sprint begins with a clear list of deliverables.
- Working software is delivered at the end of every sprint.
- Scope can evolve between sprints based on feedback and learning.
Embedded product engineering to ship features, tools, and infrastructure with minimal overhead.
I work as a flexible engineer who can pick up existing codebases, collaborate with designers and PMs, and deliver features that improve user experience and developer workflows.
Example work includes:
- Frontend development (React, Next.js, Vite)
- Internal tools, dashboards, and developer tooling
- Improving usability, performance, and maintainability
- Supporting product launches and high-impact features
Ideal for small teams that need extra engineering capacity without long onboarding or micromanagement.
Pricing
- £500–£650 per day
- £4,000–£6,000 per 2-week sprint
- Part-time retainers available
How engagements typically work
- I integrate with your existing workflow (GitHub, Linear, Jira, etc.).
- Work is planned in short delivery cycles or sprints.
- Priority tasks are agreed at the start of each cycle.
- Regular communication keeps progress transparent.
Expert advice on MVP scope, architecture decisions, and product direction.
Technical Consultation
Many projects start with a short consultation to clarify the problem, technical approach, and scope of work.
- Intro call (15–20 minutes) - free. A quick conversation to understand your project and see if I can help.
- Technical consultation (60–90 minutes) - £200. We can review product ideas, architecture, MVP scope, or research tooling strategies.
Consultation sessions often help founders refine their roadmap before starting development.
Explore, organize, and make sense of complex information.
I design and develop research-focused tools such as knowledge graphs, interactive visualizations, and data pipelines that turn large collections of papers, documents, or datasets into something searchable and explorable.
Example work includes:
- Data pipelines (Python) for collecting, cleaning, and structuring research data
- Embedding, clustering, and metadata enrichment for discovery and analysis
- Interactive web interfaces (React) for exploring relationships and trends
- CLI tools and internal dashboards for researchers and engineers
Ideal for research teams, AI labs, and startups working with complex or unstructured data.
Pricing
- £550–£700 per day
- Fixed-scope research tooling projects available from £6,000
How projects are scoped
- We begin by clarifying the data sources, research goals, and expected outputs.
- A technical approach is proposed for data processing, analysis, and interfaces.
- Projects are delivered in stages so tools can evolve alongside research needs.
Most projects begin with a short introductory call where we discuss the problem you're trying to solve, the timeline, and whether the engagement is a good fit.
Work
Version Control & Prompt History for ChatGPT
OSS Research Tool for AI Safety
A powerful tool for customer data management
Product Engineer
Navigate your ChatGPT prompts with ease. A side panel that lists your conversation prompts and branches so you can quickly jump, copy, or edit instantly without scrolling.
Design and Development
- Improved ChatGPT usability and workflow efficiency by enabling instant navigation and enhancing UX across branched conversations.
- Built with Preact, TypeScript, and Vite on the Manifest V3 framework. Implements prompt-history tracking, keyboard navigation, and branch detection via custom DOM observation and Chrome Extension APIs.
Product Engineer
An open source web app which connects thousands of research papers on AI Safety to produce a knowledge graph.
MVP Design and Development for data pipeline & UI
- Python pipeline: Harvest data from arXiv API, SQLite storage, Specter2 embeddings, RegEx and centroid filtering stages, clustering, export to JSON as graph and summaries
- CLI options for embedding (CPU vs GPU), Clustering, Filtering & Export stages
- React Vite SPA using react-force-graph-2d package for graph visualisation
- Lazy load paper summaries per node
- Search through papers via keywords
- Improved graph visualisation using D3 and pixi.js
Front-End Developer
Website Development
- NextJS + Directus CMS App
- Extended and maintained a custom design system by adding reusable UI components
- Used static site generation (SSG) for fast-loading, SEO-optimized content.
- Translated Figma designs into pixel-perfect UI implementations
- Built responsive layouts to ensure optimal performance across devices
- Integrated a community forum utilising Firebase products (Authentication and Firestore)
App Development
- React + Ruby on Rails App
- Redesigned and updated UI components to enhance user experience and integrate new API data.
- Suggested flexible component variants during PRs, resulting in more reusable and maintainable UI patterns.
Skills
design
user experience
- Application Design
- Design Systems
- Rapid Prototyping and Ideation
design management
- Art Direction
front end
html & css
- Mobile-first
- Responsive design
- Performance Optimisation
- SCSS
- Radix UI
javascript
- Vanilla JavaScript
- TypeScript
- React, Redux & Toolkit
- NextJS
- 11ty
back end
Languages & Runtimes
- NodeJS
- Python
Frameworks & APIs
- Express
- FastAPI
Databases
- MongoDB
- SQL
- Redis
- Firestore
CMS & BaaS
- Firebase
- Directus
Deployment
- AWS
- DigitalOcean
- Docker
