Full Stack Software Engineer

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🕒 September 19, 2025

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StackOne

WebsiteLinkedInAll Job Openings

11 - 50 employees

🔌 API

🤖 Artificial Intelligence

☁️ SaaS

API • Artificial Intelligence • SaaS

StackOne is a tech company specializing in advanced integration solutions that facilitate seamless connections between various SaaS products. Their platform offers a Universal Integration Layer featuring Unified APIs and AI Agent Actions, enabling users to create hundreds of integrations quickly and efficiently. They focus on providing real-time data access with a commitment to security and compliance, making it easier for businesses to manage their operations and improve their products.

📋 Description

• Act as a full-stack web application engineer: ideate, build, and ship features across frontend, backend, data, and infrastructure • Model data & schemas across SQL, document/columnar stores, and OLAP; design for correctness, performance, and cost • Design and evolve public APIs and standards: REST contracts, OpenAPI, pagination, auth, error models, plus MCP/tool-calling conventions • Engineer for scale and resilience: rate limiting, retries, idempotency, back-pressure, caching, SLIs/SLOs, and safe fallbacks • Build and operate event systems with Kafka-class streaming patterns: producers/consumers, partitioning, DLQs, reprocessing, schema evolution • Raise observability & reliability: tracing, metrics, logs, alerting, zero-downtime deploys, runbooks • Leverage LLMs/agents to accelerate development while maintaining reliability, testing, and code quality • Deliver AI features and products end-to-end and work with the wider AI team; report directly to the CTO

🎯 Requirements

• Proven experience as a full-stack engineer shipping user-facing, backend-heavy systems • Expertise in TypeScript and solid experience with React • Strong background designing and operating public APIs and multi-tenant systems • Experience with distributed systems concepts: streams, queues, idempotency, consistency, and performance trade-offs • Ability to think in systems (throughput, tail latency, failure modes) and explain trade-offs clearly • Curiosity and pragmatism with LLMs/agents: know when they help, and how to guardrail/evaluate them • Desire to work in a fast-paced startup, take ownership end-to-end, and bias toward shipping • (Preferred) Experience publishing CLIs & SDKs (internal or open-source)

🏖️ Benefits

• 25 days holiday + 1 additional day holiday per year of tenure • Participation in the company’s employee share options plan • Private health insurance (including dental & optical) • Health, fitness and gift card discounts • £1,000 for your home office set up + £500/year top-up • Paid lunch in the office • Annual team offsite • Cycle2Work and Electric Cars scheme • Hybrid work set up - typically 2d in the office