Klaviyo

www.klaviyo.com

3 Jobs

2,717 Employees

About the Company

Klaviyo is the only CRM built for B2C Brands. Powered by its built-in data platform and AI insights, Klaviyo combines marketing automation, analytics, and customer service into one unified solution. With your data all in one place, you can know, engage, and grow your audience like never before.

Powered by its built-in data platform and AI insights, Klaviyo combines marketing automation, analytics, and customer service into one unified solution, making it easy for businesses to know their customers and grow faster. Klaviyo (CLAY-vee-oh) helps relationship-driven brands like Mattel, Glossier, Core Power Yoga, Daily Harvest and 167,000+ others deliver 1:1 experiences at scale, improve efficiency, and drive revenue.

Listed Jobs

Company Name: Klaviyo
Job Title: Senior Software Engineer, Internationalisation Platform
Job Description: Job title: Senior Software Engineer, Internationalisation Platform Role Summary: Lead design, development, and maintenance of the i18n platform handling translations, localization features, multi‑currency support, and LLM‑driven workflows across front‑end and back‑end services. Mentor junior engineers, own full feature lifecycle, and collaborate with cross‑functional teams to shape product direction. Expactations: • Deliver high‑quality, customer‑facing software with a focus on internationalization and localization. • Own complex, multi‑component projects, set technical standards, and ensure system scalability, reliability, and performance. • Mentor and interview junior engineers, contribute to operational health (SLOs), and support on‑call responsibilities. Key Responsibilities: • Design and implement end‑to‑end i18n features, including translation pipelines, new localization tools, and smart translation services. • Own the full lifecycle of features: requirement refinement, architecture, coding, testing, deployment, and monitoring. • Observe, debug, and optimize system performance for high query volumes and distributed workloads. • Collaborate with product, design, and localization teams to influence feature requirements and technical constraints. • Mentor junior engineers, conduct code reviews, and participate in hiring activities. • Maintain operational excellence, define and monitor SLOs, and drive continuous improvement in the platform. Required Skills: • 5+ years of software engineering delivering production‑grade, customer‑facing services. • Strong systems thinking, experience with large‑scale distributed or microservices architectures. • Full‑stack development knowledge (React, TypeScript, JavaScript, and related front‑end/back‑end tooling). • Database design for high‑volume query workloads; performance tuning and debugging. • Proficiency in internationalization and localization concepts, including language support and multi‑currency systems. • Ability to design and evolve scalable architectures; experience with AWS or similar cloud platforms. • Excellent communication, collaboration across teams, and mentorship abilities. Required Education & Certifications: • Bachelor’s degree in Computer Science, Software Engineering, or related field (or equivalent experience). • Relevant certifications (e.g., AWS Certified Developer) are a plus.

London, United kingdom

Hybrid

Senior

12-01-2026

Company Name: Klaviyo
Job Title: Software Engineer, Internationalisation Platform
Job Description: Job title: Software Engineer, Internationalisation Platform Role Summary: Design, build, and maintain features that enable global product support—including translations, multi‑currency handling, and language‑aware workflows—within a large‑scale SaaS platform. Expectations: • 2‑5 years of software engineering experience (lower end acceptable). • Strong enthusiasm for internationalisation, localisation, and translation. • Proven ability to learn new domains, work across monolithic and micro‑service architectures, and collaborate across teams. • Demonstrated competence in full‑stack development, performance tuning, and scalable database design. Key Responsibilities: • Implement end‑to‑end i18n features, including translation pipelines, LLM‑based workflows, and currency‑management services. • Integrate new localisation services with existing front‑end and back‑end components. • Participate in agile ceremonies (stand‑ups, backlog grooming, retrospectives, on‑call duties). • Own feature ownership from scoping to delivery, ensuring high quality and reliability. • Mentor and interview junior engineers. • Debug performance bottlenecks and optimize application throughput. Required Skills: • Programming languages: Python, Go, JavaScript/TypeScript, (Python, Go, or equivalent). • Web technologies: React, REST, GraphQL, JSON‑API. • Databases: MySQL, Redis, DynamoDB, Cassandra, or similar. • CI/CD tooling and cloud infrastructure (AWS, Terraform, Kubernetes). • Experience with caching, messaging (RabbitMQ, Celery), and CDN integration. • Familiarity with translation tooling (DeepL, Smartling) and multilingual data handling. • Strong problem‑solving, debugging, and performance optimization skills. • Excellent communication and collaboration across cross‑functional teams. Required Education & Certifications: • Bachelor’s degree in Computer Science, Software Engineering, or a related technical field (or equivalent experience).

London, United kingdom

Hybrid

Junior

12-01-2026

Company Name: Klaviyo
Job Title: Senior Customer Success Manager
Job Description: **Job Title:** Senior Customer Success Manager **Role Summary** Transform customer workflows using AI and automation to drive growth and retention. Focus on delivering tailored solutions to mid-market and enterprise EMEA clients, ensuring satisfaction while maximizing Klaviyo platform value. **Expactations** 4+ years managing mid-market/enterprise accounts, relationship-building with stakeholders, and demonstrated success in customer success roles. Experience advising on marketing strategies, problem-solving, AI experimentation, and commercial discussions. Proficiency in CRM, marketing automation, data analytics, and French/English fluency. **Key Responsibilities** - Develop and execute customized customer success plans aligned with client goals. - Mitigate churn risk, identify upsell/cross-sell opportunities, and drive net revenue retention. - Strategize to increase email, SMS, and digital channel revenue via the Klaviyo platform. - Proactively monitor client performance, resolve issues, and escalate as needed. - Communicate product updates and gather feedback for engineering/product teams. - Foster a collaborative team culture centered on customer empathy and inclusion. **Required Skills** Customer success, consultative selling, problem-solving, data analysis, project management, CRM/metrics tools (Salesforce, Gainsight), and marketing automation platforms. Basic AI literacy and strong communication via phone/video/email. **Required Education & Certifications** Bachelor’s degree in marketing, business, or related field. Covey Scout assessment clearance (applicable to NYC roles).