Senior Software Engineer (.NET/JS, SQL)

Senior Software Engineer — Platform Core / AI (.NET / JS / SQL)

Location: Remote (EU time zones) or Poland • Type: Full-time

About LYNQ

LYNQ builds modern manufacturing software that helps factories plan, track, automate, analyse and optimise their operations. Our MES/APS platform is used by manufacturers globally, integrates with leading ERPs, and is deployable in the cloud or on-premises. We host on Microsoft Azure to provide secure, reliable access for our customers.

The role

We're hiring a Senior Software Engineer to evolve the core of our SaaS MES platform and to help build its next generation of AI-assisted capabilities. You'll work across core backend modules and services — runtime, ETL, and our emerging AI integration layer — shaping secure, scalable services that run smoothly in production and bringing large language models (such as Anthropic's Claude) into real manufacturing workflows.

This is a hands-on role at the full complexity level of our product: multi-tenant SaaS with hybrid on-premises deployments, deep ERP integrations, real-time scheduling, and now AI orchestration on top of all of it.

What you'll do

• Core platform: enhance runtime services, configuration, caching, telemetry, and resilient background processing across a multi-tenant architecture.

• AI development: design and build our LLM orchestration and integration layer — a central AI gateway with pluggable provider connectors, prompt template management, structured outputs, tool/function calling, and full audit logging. Ship AI-assisted product features (assistants, analysis, comparison, and scheduling/sequencing support) grounded in live MES data.

• AI safety & governance: implement guardrails for AI features operating on customer production data — tenant isolation, data minimisation, output validation, cost/usage controls, and observability of model behaviour.

• Data integrations (ETL): design integration patterns and pipelines (ingest, validate, map, reconcile; incremental syncs, retries, monitoring) between the MES and enterprise systems.

• Quality & performance: write clear, testable code; profile and tune services and queries that operate at production scale.

What you bring

• Senior-level expertise with .NET, backed by 8+ years of professional experience.

• Strong C# / ASP.NET Core skills building production web solutions.

• Hands-on experience integrating LLMs into production software: working with provider APIs (Anthropic, Azure OpenAI, or similar), prompt engineering, structured/JSON outputs, tool use, streaming, and token/cost management.

• Understanding of LLM orchestration patterns — routing across providers, retries and fallbacks, context construction, retrieval/grounding over application data, and evaluation of output quality.

• Solid JavaScript experience.

• Deep MS SQL Server knowledge (T-SQL, indexing, query tuning).

• Experience with background jobs and resilient integrations (idempotency, retries, poison-message handling).

• Security mindset (tokens/claims, roles/permissions, multi-tenancy) — including the data-handling implications of sending enterprise data to AI services.

• Clear communication, ownership, and a pragmatic approach to shipping.

Nice to have

• Experience building agentic or multi-step AI workflows (function calling, MCP, RAG pipelines, vector search).

• Familiarity with AI observability and evaluation tooling (tracing, prompt versioning, regression testing of model outputs).

• ERP/enterprise integrations (REST/OData/GraphQL); manufacturing domain familiarity.

• Experience operating SaaS plus occasional on-premises deployments.

• Familiarity with the MES space and connectors to leading ERPs.

Why LYNQ

• Modern platform with clear product focus and genuine room to influence architecture — including greenfield AI capabilities being built right now.

• Work on AI that does something real: assisting planners, operators and analysts inside live factory operations, not a demo.

• Remote-friendly team, flexible hours, supportive engineering culture.