--- title: 'Web: Full Stack Tech Lead at Clarity' canonical: 'https://feeny.ai/job/web-full-stack-tech-lead-clarity-london-j40495w4mx03' type: 'job' last_seen: '2026-09-10' --- # Web: Full Stack Tech Lead at Clarity - **Company:** Clarity - **Location:** London, United Kingdom - **Employment:** full-time - **Work type:** hybrid - **Posted:** 2025-09-17 - **Last confirmed live:** 2026-09-10 - **Apply:** https://jobs.ashbyhq.com/clarity/f6467175-bde7-4069-b896-c8282324f9ca ## Job description Full-Stack Web Developer — React, FastAPI, Elasticsearch (AWS/GCP) ## About Clarity Clarity is redefining customer experience with AI. Our mission is to empower businesses to deliver faster, smarter, and more human service interactions. By combining cutting-edge AI with intuitive design, we enable customer service teams to operate more efficiently while providing customers with seamless, personalized experiences. We are trusted by industry leaders like OpenAI, GrubHub, STC and Tabby who rely on us to deliver real impact. Our investors include Prosus Ventures, STV AI Fund (backed by Google) and angels from Open AI and Google. With a 25% month-on-month growth rate and over 300% net revenue retention, this is a unique opportunity to join a hyper growth AI company and redefine an industry. As a Full-Stack Web Developer at Clarity, you’ll own end-to-end product surfaces—from sleek React UIs to FastAPI services and Elasticsearch search/ —shipping fast, safely, and beautifully. You’re AI-native (Cursor, v0, Claude Code in your muscle memory), comfortable in both AWS and GCP, and you treat infra & DevOps as part of building great product, not an afterthought. You’ll collaborate directly with engineers, PMs, and the CTO to turn specs into production features used by brands like Grubhub, Booking, Dropbox & Uber. ## What you'll do 50% Build — design & ship - Build responsive React (TypeScript) frontends (state mgmt, data viz, virtualized tables, forms, charts, file uploads, accessibility). - Implement FastAPI services (async I/O, Pydantic v2, background jobs, caching) with robust testing. - Design Elasticsearch models & queries - Integrate AI features (streaming responses, structured outputs, eval hooks) to accelerate prototyping and user value. 25% Scale & operate - Ship and run services on AWS and/or GCP (ECS/EKS/Lambda or Cloud Run/GKE), containerized with Docker. - Own CI/CD (GitHub Actions), IaC (Terraform), logging/metrics/tracing (OpenTelemetry, CloudWatch/Stackdriver, Grafana/Prometheus), and SLOs. - Optimize p95 latency, throughput, and cost; manage secrets, networking, VPCs, and build resilient retries/backoffs. 15% Collaborate - Work closely with design/PM on specs and UX polish; pair with back-end/ML on data contracts and APIs. - Partner with the Insights team on taxonomy/schema changes and with Data/ML on search & analytics expectations. 10% Align & showcase - Write crisp docs, PRDs/tech notes, and demo your work to execs & customers. - Contribute to on-call for your services and drive post-mortems to closure. What makes you a great fit - Owner’s mindset: you take ideas from zero → shipped → observed → iterated; you sweat details and outcomes. - AI-native builder: Cursor, v0, Claude Code (and friends) are daily drivers for rapid prototyping and refactors. - React + TypeScript mastery: component design, hooks, performance, testing (Vitest/Jest, Playwright). - FastAPI expertise: async patterns, Pydantic schemas, pagination, auth (OAuth2/OIDC), rate-limits, background jobs. - Elasticsearch fluency: mappings/analyzers (ngrams, synonyms), aggregations, filters, sorting, performance tuning. - Cloud & DevOps: solid experience on AWS and/or GCP, Docker, Terraform, GitHub Actions, monitoring/alerts. - Datastores: Postgres (SQL, migrations), Redis (caching/queues). - Quality & security: code reviews, type safety, lint/format, secrets mgmt, least-privilege IAM, basic SOC2 hygiene. - Communicates clearly with product sense; ships value weekly. ## Perks and bonuses - Remote-first freedom & flexible hours 🏠 - Regular off-sites & monthly virtual game nights 🎉 - Unlimited vacation (minimum 20 days encouraged) 🏝️ - Learning budget for conferences, courses & books 📚 - Startup equity in a rapidly growing market 💼 ## About Clarity ## Company Overview - **One-liner**: Clarity is a security-first AI customer experience platform that combines customer service automation, AI agents, and voice-of-customer insights to help regulated enterprises close the loop on support issues. - **Entity Type**: Private (Series A funding led by Prosus Ventures) - **Headquarters**: London, United Kingdom - **Founded**: 2022 - **Founders**: Abed Kasaji (CEO) and Pavel Kotchetkov (CTO) ## Core Business - **Primary industry**: AI-powered customer service and customer experience (CX) software, with a strong focus on security and compliance. - **Target customers**: B2B, primarily mid-market and enterprise companies in regulated industries such as fintech, banking, telco, and healthtech. Notable customers include OpenAI, Booking.com, Saudi Electric, Tabby, Careem, and CALO. - **Mission or purpose statement**: "Make every customer experience better" by providing secure, compliant AI that helps companies truly hear their customers. ## Products & Services - **AI Agents**: Smart AI customer support agents that give accurate, rule-following answers from a company’s knowledge base, with built-in guardrails, human-in-the-loop oversight, and the ability to auto-resolve repeat issues. (SaaS) - **Voice of Customer**: A platform that aggregates chats, reviews, social media, and other feedback into one view to surface themes, track sentiment, and close the loop by turning conversations into product improvements. (SaaS) - **Agentic Customer Service**: Combines the above two — AI agents that not only answer questions but also automate routing, escalate to the right team, and drive resolution at scale. (SaaS) ## Market Standing - **Valuation/Market Cap**: Not publicly disclosed (private company) - **Key Metric**: Total funding — Series A round led by Prosus Ventures, with participation from STV AI Fund (backed by Google) and Sukna Ventures. The company also raised a seed round in 2023. Exact amounts not disclosed in search results. - **Notable Investors/Partners**: Prosus Ventures, STV AI Fund, Sukna Ventures. Also listed on Google Cloud Marketplace. - **Growth Signals**: - Headcount grew 129% year-over-year to 33 employees (as of mid-2026). - Platform serves over 20 million global subscribers and processes 700 million monthly customer interactions (per website). - Customer base includes high-profile names like OpenAI, Booking.com, and Careem. - Active hiring for 4 roles (GenAI Engineer, Full Stack Tech Lead, Product Manager – Voice of the Customer, Senior Data Engineer). ## Competitive Advantages - **Security-first design**: SOC 2 compliant, GDPR and HIPAA compliant, with data encryption in transit and at rest, role-based access, and full audit logs. Built-in guardrails (limits, approvals, audit trails) to prevent hallucinations and unsafe outputs. - **Regulatory focus**: Designed for regulated industries from the ground up, not as an afterthought. - **Closed-loop system**: Uniquely combines AI support, voice of customer, and product improvement in one platform, helping teams fix root causes rather than just tickets. - **Strong backers**: Funding from Prosus Ventures and a Google-backed AI fund provides credibility and resources. ## Strategic Focus - **Current priorities**: Expanding in regulated sectors (fintech, banking, healthtech), deepening AI capabilities (especially agentic workflows), and scaling through go-to-market partnerships (e.g., Google Cloud Marketplace). - **Direction for growth**: Building a global presence with offices in London, NYC, and Riyadh, and targeting enterprise customers across EMEA, North America, and the Middle East. ## Why Work Here - **Culture**: Fast-moving, humble, collaborative team that values customer obsession, craftsmanship, reliability, and thinking like owners. Employees have direct exposure to founders and investors. - **Remote/hybrid policy**: Flexible remote work options, with at least 2 days a week in the London office. Access to every WeWork location worldwide. - **Notable perks**: - Unlimited holiday - £500 yearly budget for courses, events, and upskilling - Meaningful equity in a growing company - ChatGPT Plus subscription - Team events and retreats - Freedom to pitch and run with your own ideas - **Engineering culture**: Emphasis on using the best tools, co-debugging, and high-craft execution. Employees get regular exposure to how a VC-backed AI startup operates. ## Sources 1. [onclarity.com](https://www.onclarity.com/careers) – Careers page with benefits, culture, and values 2. [onclarity.com](https://www.onclarity.com/) – Product overview, security features, and customer metrics 3. [onclarity.com](https://www.onclarity.com/about) – About page with founders, values, and investors 4. [builtin.com](https://builtin.com/company/clarity-onclaritycom) – Company profile with employee count, offices, and job listings 5. [linkedin.com](https://uk.linkedin.com/company/onclarity) – LinkedIn company page with employee growth, funding, and team details ## Other roles at Clarity - [Senior Data Engineer](https://feeny.ai/job/senior-data-engineer-clarity-london-ahjqww7vv1j8) — London, United Kingdom - [GenAI Engineer](https://feeny.ai/job/genai-engineer-clarity-london-v1dw2k4vs542) — London, United Kingdom - [Product Manager – Voice of the Customer](https://feeny.ai/job/product-manager-voice-of-the-customer-clarity-london-1m5d60prq3k3) — London, United Kingdom