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- Tasks: Build and scale AI-powered features for a cutting-edge marketing platform.
- Company: Join Boldstream, an innovative AI-native marketing SaaS company.
- Benefits: Unlimited holiday, private healthcare, flexible working, and monthly benefits budget.
- Why this job: Shape the future of brand communications with major global brands.
- Qualifications: Experience in software engineering, TypeScript, and AI technologies.
- Other info: Be part of a carbon-neutral business focused on profit, people, and planet.
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 is 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 are 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 are 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, 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 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 will own the end-to-end delivery of AI-powered features across Boldstream. This is not a prototyping role. You will 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
- Supabase (Postgres, vector search, auth, edge functions)
You will design, ship, observe and iterate on AI features that materially affect customer adoption, trust and long-term value.
What You Will 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 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 work
Benefits
- Pensions: a 5% employer contribution.
- Private Healthcare: Vitality
- 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
Contact Detail:
Boldspace 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 current Boldstream employees on LinkedIn. A personal introduction can make all the difference when you're applying.
✨Tip Number 2
Show off your skills! Create a portfolio or GitHub repository showcasing your projects, especially those involving AI and modern web stacks. This gives us a glimpse of your capabilities beyond just your CV.
✨Tip Number 3
Prepare for the interview by brushing up on your technical skills and understanding Boldstream's mission. We love candidates who can articulate how their experience aligns with our goals in AI-native marketing.
✨Tip Number 4
Apply through our website! It’s the best way to ensure your application gets seen by the right people. Plus, it shows you’re genuinely interested in joining our team at Boldstream.
We think you need these skills to ace Senior Software Engineer in London
Some tips for your application 🫡
Tailor Your CV: Make sure your CV reflects the skills and experiences that align with the Senior Software Engineer role. Highlight your experience with AI, TypeScript, and any relevant projects you've worked on that showcase your ability to build production-grade systems.
Craft a Compelling Cover Letter: Use your cover letter to tell us why you're excited about Boldstream and how you can contribute to our mission. Share specific examples of your past work that demonstrate your expertise in AI and software engineering.
Showcase Your Projects: If you've worked on any relevant projects, whether personal or professional, make sure to include them in your application. We love seeing real-world applications of your skills, especially those that involve AI and modern web stacks.
Apply Through Our Website: We encourage you to apply directly through our website for the best chance of getting noticed. It helps us keep track of applications and ensures you’re considered for the role as quickly as possible!
How to prepare for a job interview at Boldspace
✨Know Your Tech Stack
Make sure you’re well-versed in TypeScript, Node, and the other technologies mentioned in the job description. Brush up on your knowledge of OpenAI's tools and LangChain, as these will be crucial for the role. Being able to discuss how you've used these technologies in past projects will show that you're ready to hit the ground running.
✨Showcase Your Problem-Solving Skills
Prepare to discuss specific challenges you've faced in previous roles, especially those related to AI and software engineering. Think about how you approached these problems, the solutions you implemented, and the outcomes. This will demonstrate your ability to think critically and adapt in a fast-paced environment.
✨Understand Boldstream’s Vision
Familiarise yourself with Boldstream’s mission and the impact of their AI-native platform. Be ready to share your thoughts on how you can contribute to their goals of redefining marketing and communications through technology. Showing genuine interest in the company’s vision will set you apart from other candidates.
✨Prepare Questions
Have a list of insightful questions ready to ask your interviewers. This could include inquiries about the team dynamics, the future direction of Boldstream, or how they measure success in the role. Engaging in a two-way conversation shows that you’re not just interested in the job, but also in the company culture and growth.
