Find a job 
Featured Companies 
Featured Universities 
For Companies At a Glance
- Tasks: Build and scale AI features for a cutting-edge marketing platform used by major brands.
- Company: Join Boldstream, an innovative AI-native marketing SaaS company with a collaborative culture.
- Benefits: Unlimited holiday, flexible working, monthly benefits budget, and a transparent bonus structure.
- Why this job: Make a real impact in AI-driven marketing while working with top brands and technologies.
- Qualifications: Experience in software engineering, particularly with TypeScript and AI tools.
- Other info: Dynamic team environment with opportunities for personal growth and wellness support.
The predicted salary is between 48000 - 84000 £ per year.
Help build and scale the AI platform shaping the future of brand and communications. Boldstream™ has just launched, and it's already in the hands of some of the world's biggest brands. In the weeks since launch, Boldstream has seen adoption from large, sophisticated organisations trailing the platform to rethink how strategy, creativity and performance come together through AI. We're at an inflection point: real customers, real data, real commercial momentum, and a clear opportunity to define a new category of AI-native marketing and communications software. We're now looking for a Senior Engineer to help us scale Boldstream from early success into a category-defining platform.
About Boldstream & Boldspace
Boldstream™ is an AI-native marketing and communications SaaS platform built by Boldspace and their engineers, a 6-year-old brand and communications business that has grown year-on-year since inception. Our founders experienced first-hand the lack of transparency, measurement and actionable insight in the industry, and decided to build the platform they wished they'd had.
From day one, Boldstream has focused on:
- Agentic workflows that bring together strategy, creativity and performance
- Retrieval-augmented insights grounded in client and platform data
- Intelligent automation across analytics, reporting and insight generation
Requirements
As a Senior Engineer, you'll own the end-to-end delivery of AI-powered features across Boldstream. This is not a prototyping role. You'll be building production-grade, customer-facing systems used by major brands, working at the intersection of:
- OpenAI's latest agentic tooling
- LangChain / LangGraph
- TypeScript and modern web stacks
You'll design, ship, observe and iterate on AI features that materially affect customer adoption, trust and long-term value.
What You'll Work On:
- AI & Agentic Product Development
- Design and implement agentic workflows using OpenAI (Responses API, AgentKit, Agent Builder) and LangChain / LangGraph
- Build reliable multi-step reasoning systems with tool-calling, fallbacks, guardrails and evaluation
- Architect and implement RAG pipelines (embeddings, retrieval strategies, caching) grounded in Boldstream and client data
- Power analytics copilots, automated reporting, insight generation and internal tools
Full-Stack Ownership
- Backend: TypeScript / Node or edge functions, Supabase (Postgres + vector store), schema design, migrations and performance tuning
- Frontend: Modern TypeScript front-ends (React / Next.js or similar) for dashboards, workflows and internal tooling
- Integrate OpenAI and other LLM providers with strong observability, cost controls and resilience
Engineering Quality & Platform Foundations
- Champion testing and reliability: unit tests, integration tests, synthetic prompt evals, agent health checks
- Improve CI/CD pipelines, deployment strategies and AI-ready infrastructure
- Use modern tooling (GitHub, Linear, Cursor, Lovable, etc.) to manage projects
Pensions: a 5% employer contribution.
Holiday: unlimited holiday (including all UK public holidays) - we trust our staff to take the time they need and still excel in their jobs - and days off for birthdays and moving house are guaranteed!
Very Flexible working
Socials: team socials regularly, chosen by the team.
Team retreats: time to get to know each other away from the office.
Bonus: transparent bonus structure where you can receive a % of base salary based on personal and company performance.
Supporting good causes: we contribute some of our outperformance to charitable causes which the team help choose.
Wellness: time within working hours every week for those that want or need it.
Monthly benefits budget: £50 per month, every month, to spend on whatever you want - from a home delivered vegetable box and discounted gym memberships, to mental health support and professional coaching.
A CARBON NEUTRAL BUSINESS
Boldspace measures its performance on profit, people and planet combined. From day one, we will offset your carbon footprint entirely. The cost of this is covered 100% by the company.
Senior Software Engineer in London employer: Boldspace | B Corp™
Contact Detail:
Boldspace | B Corp™ Recruiting Team
StudySmarter Expert Advice 🤫
We think this is how you could land Senior Software 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 put in a good word for you.
✨Tip Number 2
Show off your skills! Create a portfolio showcasing your projects, especially those that align with AI and software engineering. This is your chance to demonstrate what you can bring to Boldstream and how you can help scale their platform.
✨Tip Number 3
Prepare for interviews by diving deep into Boldstream’s mission and values. Understand their AI-native approach and think about how your experience can contribute to their goals. Tailor your responses to show you’re the perfect fit!
✨Tip Number 4
Don’t forget to apply through our website! It’s the best way to ensure your application gets seen. Plus, it shows you’re genuinely interested in being part of the Boldstream team.
We think you need these skills to ace Senior Software Engineer in London
Some tips for your application 🫡
Show Your Passion for AI: When you're writing your application, let your enthusiasm for AI and its potential in marketing shine through. We want to see how you can contribute to shaping the future of Boldstream with your unique insights and experiences.
Tailor Your Experience: Make sure to highlight your relevant experience with TypeScript, Node, and any AI tools you've worked with. We love seeing how your background aligns with our needs, so don’t hold back on those specific projects that showcase your skills!
Be Clear and Concise: While we appreciate creativity, clarity is key in your application. Keep your language straightforward and ensure your points are easy to follow. This will help us understand your qualifications without getting lost in jargon.
Apply Through Our Website: We encourage you to apply directly through our website. It’s the best way for us to receive your application and ensures you’re considered for the role. Plus, it shows us you’re keen on joining the Boldstream team!
How to prepare for a job interview at Boldspace | B Corp™
✨Know Your Tech Stack
Make sure you’re well-versed in TypeScript, Node, and the modern web stacks mentioned in the job description. Brush up on your knowledge of OpenAI's tools and LangChain, as these will be crucial for the role.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific examples where you've designed and implemented complex systems. Highlight your experience with multi-step reasoning systems and how you've tackled challenges in past projects.
✨Understand Boldstream’s Vision
Familiarise yourself with Boldstream’s mission and the importance of AI in marketing and communications. Be ready to share your thoughts on how you can contribute to shaping this new category of software.
✨Ask Insightful Questions
Prepare thoughtful questions about the team dynamics, the company culture, and the future direction of Boldstream. This shows your genuine interest and helps you assess if it’s the right fit for you.
