Senior Full Stack Product Engineer in London

A BIT ABOUT THISTHAT: ThisThat is a data and intelligence company focused on proving and improving the power of influence. We help brands and agencies answer three simple questions: what happened, why it happened, and what to do next to grow. Born in social and built for influencer, ThisThat has set the gold standard for influencer marketing measurement. We make it simple and enjoyable to quantify the true impact of campaigns by capturing high-quality insight from the communities who see your ads in real time. Everything is powered by technology that reshapes what best-in-class looks like. Our work uncovers the drivers of the funnel from awareness and consideration to action intent and advocacy, with clear levers to grow. We show brands how to lift influence with stronger creative, smarter targeting and distribution, and more relevant storytelling. Global leaders such as Meta, Unilever, Amazon, Goat, Influential, and Influencer rely on ThisThat for clarity, confidence, and growth. By redefining Brand Lift for the influence era, we are changing the way advertisers understand impact and how consumers shape the stories they care about. Better measurement. Better growth.

ROLE SUMMARY: We are looking for a senior full-stack product engineer with experience taking ownership of projects, code, database architecture, and scalability. You will need to be proactive, keen to learn and apply your existing knowledge, and hard-working. You will need to thrive in the startup environment where you have significant responsibility. You should be a super-star - someone who can learn quickly, take ownership, and is excited by responsibility and rapid innovation. We’re 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.

OUR PRODUCTS: The engineering team you’ll be joining are responsible for three main products:

• Our (mainly internal) platform where our insight team and our clients design surveys and analyse results
• Our SaaS platform (2D), which is built for scale as a pure-tech product
• Our survey interface, where people respond to surveys

KEY RESPONSIBILITIES:

• Hands-on building: Build features across the full stack that support adding value 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’re always delivering the best value for the business
• Best Practices: Set technical best practices, balancing pace of delivery with quality, scalability and productivity
• Advocate and implement high-speed processes and practices for writing high-quality code and conducting thorough code reviews
• Collaborate on technical strategic decision-making, balancing the needs of the business with technical feasibility and performance
• Security and Reliability: Collaborate to ensure the ongoing reliability of our systems
• Ensure you build secure and performant code and systems
• Product Engineering: This is a product engineering role, where you must have excellent communication skills with key stakeholders and a product mindset
• Have a strong voice in problem discovery and solution architecting, always from a product and customer mindset
• Cross-department collaboration: 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
• Mentoring: Provide mentorship, guidance, and feedback to team members to help them improve both technically and professionally
• Foster a culture of collaboration, ownership, trust, and continuous improvement within the team

QUALIFICATIONS & EXPERIENCE:

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

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.
• You have a passion for AI and agentic workflows

OUR TECH STACK: Our main technologies are:

• GitHub (with GitHub actions)
• TypeScript (Javascript) (backend & frontend)
• Node.js (backend)
• NestJS (backend)
• Angular (+ HTML, SCSS) (Material UI in SaaS platform)
• React (with Next.JS framework, custom MUI components)
• TypeORM (backend)
• PostgreSQL (backend)
• Google Cloud

WHY JOIN? You’ll be a real value-adder in a team already defining a global category. Base Salary of £80,000 - £110,000 💸 Share options so you benefit from our success 🚀 28 days paid holiday plus bank holidays 🏖️ Hybrid & flexible working (working from the office 3 x per week) - and dogs are welcome at our Shoreditch office! 🐶 Access to our Benefitts package, to support your health and happiness 🙌 Regular (optional) socials and charity away days 📅

Please read before applying: You need to understand that ThisThat is an early-stage startup in its hyper-growth period. We run a lean, fast, and agile operation while delivering stellar work. We take our work, but not ourselves, very seriously and often roll up our sleeves to go the extra mile and deliver. This role isn’t for everyone - we need individuals who thrive under pressure and take accountability. While you’ll be working with an incredibly talented team full of collaboration and learning opportunities, everyone has a lot of ownership and responsibility, and so will you. You could belong to a team whose values center on transparency, being all in, having customer obsession, acting as one team, and operating with scrappiness. This is your chance to do the best work of your career. Are you ready to be at the forefront of innovation, ride the rollercoaster of hyper-growth, and shape an industry? Backed by Tier 1 VCs and 4x Unicorn founders, we need people who are ready to grow at our pace. With clients globally across EMEA, APAC, and the US, this role may involve client calls outside usual working hours. If you have a strong work ethic, are a driven self-starter, and a fast learner looking for a challenge, this might just be your dream job, and we’d be keen to have a chat!

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.