Javascript jobs in United Kingdom

At Klaviyo, we value the unique backgrounds, experiences and perspectives each Klaviyo (we call ourselves Klaviyos) brings to our workplace each and every day. We believe everyone deserves a fair shot at success and appreciate the experiences each person brings beyond the traditional job requirements. If you’re a close but not exact match with the description, we hope you’ll still consider applying. Want to learn more about life at Klaviyo? Visit careers.klaviyo.com to see how we empower creators to own their own destiny.

At Klaviyo, the Sales team prides themselves on being marketing and product experts. While most companies hire pre sales Solutions Architects to just give demos, fill out questionnaires, and only explain setups, that makes us yawn. As a pre sales Solution Architect for Mid-Market or Enterprise Sales, you will be responsible for facilitating long term, deep relationships with the prospects to help drive our market-leading position in the owned marketing space.

So what do we do as Solution Architects? We work directly with our prospective and existing customers to build technical champions, and help envision how Klaviyo could be used and integrated within our prospects’ and customers' tech stacks. We dive deep, take a consultant-first mindset, and develop solutions that ensure long term success for our customers. We use these engagements as an opportunity to learn, prototype, and ship meaningful improvements to the Klaviyo experience. We look for interesting problems and aim for solutions that are extensible and reusable.

A few things our team has recently built as part of our engagements include:

• Write integration specifications for customers hosting their eCommerce stores on non-standard platforms, ensuring seamless data flow while maintaining platform integrity
• Developed a new integration for Demandware from scratch, showcasing our capability to expand Klaviyo’s ecosystem of partners
• Built Klaviyo's first ever public chrome extension, which allows anyone (marketer or developer) to troubleshoot and audit their front end API calls being sent to Klaviyo more easily.

If you’re a creator that gets excited by driving technical success and prototyping new solutions - all within the context of influencing direct strategic sales - this could be for you. What you’ll get in return is the opportunity to be part of an extremely high-performing, strategically-important team that works at the exciting intersection of engineering, sales, and customer engagement.

How You’ll Make a Difference:

• Spearhead the technical and solution pre sales campaign to prospective Klaviyo Mid Market and Enterprise clients to help Klaviyo hit its revenue targets, including
• Technical discovery around current customers architectures, understanding their business and technical challenges and opportunities
• Host technical workshops where you’ll be working with developers and business teams to align technical solutions to overall business outcomes
• Architect and execute Proof of Value plans to achieve technical selection over the competition
• You will become a complete expert in the Klaviyo experience, from understanding the data pipelines and code base of our integrations to understanding technical tradeoffs between different implementations
• Support product field alignment by being the voice of our customer needs and working closely with our Developer Experience team and Product teams to synthesize product gap information
• Be the go-to internal technical and subject matter expert resource, educating sales team members as well as prospects/customers to provide a consistently positive Klaviyo experience.

Who You Are:

• 7+ years experience in sales engineering, solutions engineering/architecture for a software product
• 5+ years in a role working with web development languages (Javascript, Node.js, React); REST APIs; and/or with a general purpose programming language such as Python
• Strong domain knowledge in several of the following areas and a proven ability to learn new domains quickly: marketing automation tools, customer data platforms (CDP), eCommerce systems, mobile apps, analytics, ad tech, data engineering
• Proven ability to track and learn from the ever-changing technical landscape and incorporate modern, optimized solutions to high-value problems
• A compelling and honest communicator and storyteller who can impress prospects at any level from executive to developer, with the capability to persuade technical stakeholders as well as explain technical concepts to non-technical stakeholders
• A strong salesperson at heart—driven by customer outcomes, skilled at uncovering pain, articulating value, and closing technical wins in partnership with account executives; familiar with MEDDPICC and other structured qualification and sales methodologies

#LI-Hybrid

We use Covey as part of our hiring and / or promotional process. For jobs or candidates in NYC, certain features may qualify it as an AEDT. As part of the evaluation process we provide Covey with job requirements and candidate submitted applications. We began using Covey Scout for Inbound on April 3, 2025.

Please see the independent bias audit report covering our use of Covey here

Our salary range reflects the cost of labour in the country where the job post is advertised. The base salary offered for this position is determined by several factors, including the applicant’s job-related skills, relevant experience, education or training, and work location.

In addition to base salary, our total compensation package may include participation in the company’s annual cash bonus plan, variable compensation (OTE) for sales and customer success roles, equity, sign-on payments, and a comprehensive range of health, welfare, and wellbeing benefits based on eligibility. Please visit Klaviyo Rewards - Global Benefits to find out more about our Total Rewards package.

Your recruiter can provide more details about the specific salary/OTE range for your preferred location during the hiring process.

Base Pay Range in Local Currency: £97,920 — £146,880 GBP

Get to Know Klaviyo

We’re Klaviyo (pronounced clay-vee-oh). We empower creators to own their destiny by making first-party data accessible and actionable like never before. We see limitless potential for the technology we’re developing to nurture personalized experiences in ecommerce and beyond. To reach our goals, we need our own crew of remarkable creators—ambitious and collaborative teammates who stay focused on our north star: delighting our customers. If you’re ready to do the best work of your career, where you’ll be welcomed as your whole self from day one and supported with generous benefits, we hope you’ll join us.

Klaviyo is committed to a policy of equal opportunity and non-discrimination. We do not discriminate on the basis of race, ethnicity, citizenship, national origin, color, religion or religious creed, age, sex (including pregnancy), gender identity, sexual orientation, physical or mental disability, veteran or active military status, marital status, criminal record, genetics, retaliation, sexual harassment or any other characteristic protected by applicable law.

IMPORTANT NOTICE: Our company takes the security and privacy of job applicants very seriously. We will never ask for payment, bank details, or personal financial information as part of the application process. All our legitimate job postings can be found on our official career site. Please be cautious of job offers that come from non-company email addresses (@klaviyo.com), instant messaging platforms, or unsolicited calls. By clicking "Submit Application" you consent to Klaviyo processing your Personal Data in accordance with our Job Applicant Privacy Notice. If you do not wish for Klaviyo to process your Personal Data, please do not submit an application. You can find our Job Applicant Privacy Notice here and here (FR).