Location: Bristol, UK — predominantly in-house
Experience: 4+ years operating on AWS with meaningful DevOps ownership
About Us
Narwhal Labs is a fast-growing tech start-up based in Bristol. We are building an AI communications platform at scale, and our engineering team is central to everything we do.
We are looking for a Senior Fullstack Engineer who thrives on ownership, enjoys building reliable systems and wants to help shape the architecture of a product used by real customers in production.
The Role:
We are looking for a Senior Fullstack Engineer to own our microservices platform on AWS. You will build reliable, multi‑tenant services and a first‑class integration layer spanning messaging, outreach, CRM, billing, analytics and payment systems that powers a SaaS product at scale.
This is an office‑based role and candidates must be located in or within commutable distance of Bristol.
Responsibilities:
* Design and build microservices behind API Gateway (REST/HTTP), running on Lambda and containerised workloads on EC2/Fargate
* Model multi‑tenant data across DynamoDB and RDS (PostgreSQL), using S3 for object storage and KMS for secrets and encryption
* Build and maintain an integrations layer including OAuth/API‑key onboarding, webhook ingestion with idempotency, retries and DLQs, rate‑limit mediation, circuit breakers and versioned connector contracts
* Integrate with third‑party platforms and payment systems, ensuring secure, reliable and scalable flows for transactions, billing and data exchange
* Design and implement event‑driven architecture by publishing and consuming domain events via SQS, SNS and EventBridge, using Step Functions where orchestration is needed
* Maintain observability and reliability through structured logging, metrics and alerts with CloudWatch, trace propagation and error budgets
* Apply security best practices including least‑privilege IAM, secret rotation, per‑tenant isolation and audit logs
* Define infrastructure as code using AWS SAM and ship via GitHub Actions with automated tests and canary/blue‑green deployments
* Define clear API contracts with frontend and AI services, and document runbooks and postmortems
Requirements:
* 4+ years operating on AWS with meaningful DevOps ownership — you have shipped and run production systems
* Hands‑on experience with Lambda, EC2/Fargate, API Gateway, S3, DynamoDB, RDS (PostgreSQL), SQS/SNS/EventBridge, CloudWatch and KMS
* Infrastructure as code experience with AWS SAM including templates, pipelines and parameterised stacks
* CI/CD experience with GitHub Actions and automated testing using tools such as Jest/Vitest, Postman/Newman or Pact
* Strong backend development in Node.js/TypeScript (Go or Python also welcome) and solid API design skills across REST, with GraphQL a plus
* Strong data modelling skills including NoSQL vs relational trade‑offs, partitioning, indexing and migration strategies
* Proven experience building and consuming webhook‑heavy third‑party integrations with idempotency and signature verification
* Experience integrating with payment gateways such as Stripe, Adyen or Braintree and handling PCI/DSS‑compliant transaction flows
Nice to have:
* Event choreography with Step Functions, schema registries and outbox patterns
* OpenTelemetry/X‑Ray tracing and cost and performance tuning for Lambda and RDS
* Experience with Cognito/OIDC, RBAC/ABAC and multi‑tenant isolation patterns
* Familiarity with real‑time delivery via WebSockets or SSE and streaming responses
* Background in building connector SDKs or integration marketplaces
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