Senior Full Stack Product Engineer

ThisThat; Greater London; Hybrid; GBP 80,000 - 110,000; Full time

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Hybrid & flexible working

Dogs welcome at Shoreditch office

Job summary

ThisThat is hiring a Senior Full-Stack Product Engineer in London (Shoreditch). You will own and drive major domains in a growing product platform, building across four key products including an internal survey platform, a scale-ready SaaS product, an intuitive survey interface, and a client platform powered by AI agents.

We value autonomy, curiosity, and a product-minded engineer who thrives in a fast-paced startup environment and has a track record in MarTech/AdTech, AI features, and B2B SaaS.

Qualifications

• Expertise in TypeScript and modern front-end frameworks (React or Angular).
• Strong NodeJS experience and cloud exposure (GCP/AWS/Azure).
• Background in early-stage, high-growth startups with a product mindset.

Responsibilities

• Build features across the full stack that impact internal and external products.
• Collaborate across planning, refinement, execution and retrospectives.
• Balance pace with quality to deliver maximum business value.
• Drive technical best practices and code quality through reviews.
• Contribute to strategic technical decisions with a product focus.
• Engage with data/product teams; align priorities and trade-offs.

Skills

TypeScript

ReactJS

Angular

NodeJS

Cloud (GCP/AWS/Azure)

Early-stage startup

Product mindset

Founding experience

NestJS

AI features

Creator economy

CSS

B2B SaaS / enterprise

Tools

NestJS

Job description

Role: Senior Full Stack Product Engineer

Reporting to the Director of Engineering | London (Shoreditch) | Full-time

A BIT ABOUT THISTHAT

ThisThat is an influence intelligence company helping brands grow and govern influence. The $4T marketing industry is shifting from the personalisation era, obsessed with advertising effectiveness, to the community era, where influence is the currency. No governing system of influence exists yet.

ThisThat is building it, making influence measurable, predictable, governable, and investable.

Built on the world's largest brand lift dataset in influencer marketing, our continuous, compounding intelligence predicts, optimises, and measures influence at every stage, from strategy and planning through execution and reporting, connecting campaign performance to boardroom decisions.

Trusted by 50+ leading agencies and 250+ global brands, including Meta, Unilever, Amazon, MrBeast, WPP, and Publicis. VC-backed with investment from four unicorn founders. Winners of Best Technology and Best Data-Driven Campaign at the Global Influencer Marketing Awards.

Lift Your Influence.

ROLE SUMMARY

We are looking for a senior full-stack product engineer to own and drive significant domains in a dynamic and growing product platform. You will need to be proactive, curious, and pragmatic, keen to learn and apply your existing knowledge. You should demonstrate high autonomy and accountability, with an ability to drive practical innovation and adapt to business needs. We are looking for people who are excited about the potential of influencer marketing and how technology can be used to drive increased growth and outcomes from campaigns. Experience in marketing/MarTech/AdTech and panels will set you apart in this role.

You will build across four key products:

• Our (mainly internal) platform, where our insight team and select partners design surveys and analyse results
• Our SaaS platform (2D), built for scale as a pure-tech product
• Our survey interface, where people respond to surveys
• Our client platform, where clients interact with our AI Agent “Thia”, track project spend and status, and plan strategies grounded in industry-leading data

KEY RESPONSIBILITIES

Hands-On Building

• Build features across the full stack, significantly impacting internal and external products across the business
• Engage with all stages of the development process, from planning and refinement to execution and retrospectives
• Balance pace with quality to ensure you are always delivering the best value for the business

Best Practices

• Collaborate on driving technical best practices, helping to balance pace of delivery with quality, scalability and productivity
• Collaborate on and participate in high-speed processes and practices for writing high-quality code and conducting thorough code reviews
• Contribute to technical strategic decision-making, balancing the needs of the business with technical feasibility and performance
• This is a product engineering role: excellent communication with key stakeholders and a product mindset are essential
• Have a strong voice in problem discovery and solution architecting, always from a product and customer mindset

Security and Reliability

• Collaborate to ensure the ongoing reliability of our systems
• Build secure and performant code and systems

Collaboration and Culture

• ThisThat has a diverse set of skills in its small team: collaborate with them proactively to get the best outcomes
• Work directly with our data and product teams to build integrated solutions
• Communicate candidly and respectfully, aligning early on priorities, trade-offs, and changes
• Help teammates grow via pairing, code reviews, and coaching, reinforcing shared ownership and continuous improvement
• Build trust through 360 feedback: give clear, actionable feedback and invite it from others

QUALIFICATIONS AND EXPERIENCE

• Expertise in TypeScript
• Expertise in either ReactJS or Angular
• Experience with NodeJS
• Strong experience with a cloud service provider like GCP, AWS or Azure
• Experience in early-stage, high-growth startup environments
• A product mindset and experience making product decisions
• Previous founding (or first few hires) experience
• Experience with NestJS
• Experience building AI (LLM)-integrated features
• Experience or interest in the creator economy
• A good eye for design and expertise with CSS
• Background in B2B SaaS and/or enterprise software

OUR TECH STACK

• TypeScript (backend & frontend)
• Node.js with Hono or NestJS (backend)
• React / Angular
• GitHub (with GitHub Actions)

KEY SKILLS & ATTRIBUTES

• Strong communication ability with engineers and commercial stakeholders
• Ability to reliably drive complex cross-team projects
• Excitement for the startup environment: this is a fast-paced company with high ownership and low ego
• You understand marketing measurement as both a data and a business problem
• A passion for continually improving workflows and processes, including with AI and agentic workflows

WHY JOIN

• You will be a real value-adder in a small team already defining a global category, with real ownership and responsibility from day one.
• Base Salary of £80,000 - £110,000
• Share options so you benefit from our success
• Hybrid & flexible working (working from the office 3x per week) - and dogs are welcome at our Shoreditch office!
• Access to our Benefits package, to support your health and happiness
• Regular (optional) socials and away days

DIVERSITY & INCLUSION

ThisThat is committed to fostering a diverse, inclusive, and equitable workplace where all team members feel valued and empowered. We celebrate the unique perspectives and backgrounds of our employees and believe that diversity drives innovation and excellence. ThisThat is proud to be an equal opportunity employer. We welcome applicants of all races, national origins, genders, gender identities, sexual orientations, ages, abilities, veteran statuses, and other legally protected characteristics. If you need accommodations during the application process, please contact us.