Senior Developer - Intelligent Workflow Systems

We’re building intelligent workflow and document-processing systems that solve real operational problems. At Demarq, we work on platforms that ingest documents and data from multiple sources, extract and validate information, and drive structured workflows and automation. This is not a “maintain tickets in a sprint board” role. You’ll be working on systems that deal with:

• Incomplete and inconsistent real-world data
• Event-driven workflows and orchestration
• Validation, exception handling, retries, and state management
• Integrations with customer and third-party systems
• Operationally important processes where reliability matters

We’re looking for a strong senior engineer who can contribute beyond implementation alone.

The role

• Design and build backend services, APIs, and workflow components
• Work on document processing, data extraction, and validation flows
• Contribute to technical and architectural decisions
• Work across backend systems, integrations, and occasional frontend implementation where needed to deliver complete solutions
• Take ownership of features from design through to production
• Join customer or stakeholder discussions where technical input is needed

This role requires someone who:

• Builds well
• Thinks clearly
• Makes pragmatic technical decisions
• Communicates professionally

What we’re looking for

This role will suit someone who:

• Has strong backend engineering experience (Python preferred)
• Understands distributed systems and event-driven architectures
• Has built production systems, not just isolated services
• Can work comfortably with ambiguity and evolving requirements
• Understands how systems fail and designs accordingly
• Makes sensible trade-offs instead of chasing “perfect” solutions
• Can explain technical decisions clearly to both technical and non-technical audiences

If you need tightly defined tickets and perfectly clean inputs, this probably won’t be the right fit.

Technical environment

• AWS serverless technologies including Lambda, API Gateway, DynamoDB, S3, SQS/SNS, and EventBridge
• APIs, integrations, and asynchronous processing systems
• Workflow orchestration and event-driven architectures
• React / TypeScript where required
• OCR, Intelligent Document Processing, or LLM-assisted workflows
• CI/CD and automated testing practices

We care far more about engineering judgement, ownership, and problem-solving capability than matching a checklist of tools.

What this role is not

• Not a pure frontend role
• Not a narrow backend ticket-delivery role
• Not a DevOps/platform infrastructure role
• Not a role for someone who wants to work in isolation

You’ll be expected to design, build, collaborate, and take ownership.

Work on meaningful automation and workflow problems. Build systems that handle real-world complexity. Shape architecture and engineering direction. Join a small, capable team with low bureaucracy. Work directly with customers and stakeholders using the systems being built. Have visible impact on both technology and delivery.

We care about building maintainable systems and making sensible long-term engineering decisions, not just delivering quickly.

Package

Up to c.£85k depending on capability and fit. Senior role with meaningful ownership and responsibility. Customer-facing exposure without becoming a pure consultancy role. UK-based preferred. We cannot sponsor visas at this point.

Important

We are not engaging recruiters or agencies for this role. Unsolicited outreach will not receive a response. If interested, apply directly or message with:

• A short summary of relevant systems you’ve built
• Any links to shipped work, projects, or technical material where appropriate