Full Stack Developer/Tester

Ben Fatto

WorldwideremotePosted 23 days ago

Skill Required

Fullstack-DevelopmentBackend-EngineeringFrontend-EngineerQA-EngineeringDevOps-EngineerFull-Stack-DeveloperFull-Stack-QA-EngineerFull-Stack-Software-DeveloperFull-Stack-TestingFull-Stack-Web-DeveloperFull-Stack-EngineerFull-Stack-QAFull-Stack-Developer-(JavaScript-Python)Full-Stack-JavaScript-DeveloperFull Stack DeveloperGenerative AIQuery OptimizationManual TestingTest AutomationDockerObservabilityKubernetesSQL ServerEngineeringPlaywrightautomationLangChaindesigningsimilar)RESTbuildingAngularetc.)TestNGPythondesignDevOpsOpenAPI.NETAzureFulltime

Key highlights

7+ years of .NET/C# development experience.
7+ years of SQL Server experience.
3+ years of Angular UI development experience.
2+ years of agentic AI workflow integration experience.
Hands‑on experience with AWS and/or GCP cloud platforms.

Role overview

We are seeking an experienced, true full stack Developer/Tester to own an application end‑to‑end, encompassing an Angular front‑end, .NET API and backend services, SQL Server data layer, and automated testing. The ideal candidate will fluidly move across the stack, building UI components, designing API contracts, writing performant stored procedures, and authoring test suites, while also integrating agentic AI workflows using existing LLM services rather than training or fine‑tuning models.

Responsibilities

Design and build responsive, maintainable Angular applications and components, including state management, routing, and reusable component libraries.
Consume and integrate REST APIs into the UI, handling loading states, error handling, and data validation.
Build UI components that surface agentic AI features (chat interfaces, recommendation panels, agent status/monitoring dashboards, etc.) within existing or new applications.
Collaborate with design/UX to translate requirements into polished, accessible interfaces.
Design and develop backend services and APIs in .NET (C#), following REST/gRPC best practices for consumption by the Angular front‑end and downstream systems.
Architect and implement integration layers connecting Python‑based agentic services with .NET applications (via APIs, message queues, or SDKs).
Apply solid software design principles (SOLID, dependency injection, clean architecture) to keep backend services maintainable and testable.
Ensure secure, scalable, and maintainable integration patterns across all application layers.
Design, optimize, and maintain SQL Server databases supporting transactional application data and agentic workflow data (logging, agent state, audit trails, metadata).
Write and tune complex stored procedures, queries, indexes, and ETL processes for both application and agentic workflow needs.
Own data model design decisions in partnership with backend and API development.
Build and maintain automated test suites using Playwright for UI and end‑to‑end testing across the full application stack.
Write unit and integration tests for .NET services and APIs as part of the standard development workflow, not as a separate hand‑off.
Develop testing strategies specific to agentic systems (prompt regression testing, output validation, agent behavior testing, edge‑case/adversarial testing).
Participate in code reviews, CI/CD pipeline maintenance, and release quality gates.
Integrate with third‑party or internally hosted AI/LLM APIs (e.g., OpenAI, Anthropic Claude, Azure OpenAI, Bedrock, Vertex AI) to power agentic capabilities within applications.
Write Python‑based scripts/services for agent orchestration using frameworks such as LangChain, LangGraph, AutoGen, Semantic Kernel, or similar, and wire them into the .NET/Angular application stack.
Deploy, monitor, and manage application services and supporting infrastructure on AWS and/or GCP (e.g., Lambda/Cloud Functions, container services, storage, IAM).
Collaborate with DevOps to ensure scalable, cost‑efficient, and secure cloud deployments across the full stack.

Requirements

7+ years of professional experience in .NET / C# development (API and backend services).
7+ years of experience with SQL Server (database design, optimization, stored procedures, performance tuning).
3+ years of hands‑on Angular UI development experience, including component architecture, state management, and consuming REST APIs.
Demonstrated true full stack ownership: comfortable working across Angular, API design, .NET backend, SQL Server, and test automation without needing to hand off between specialists.
2+ years of hands‑on experience building or integrating agentic AI workflows/systems that orchestrate existing AI/LLM APIs (not model training or fine‑tuning).
Experience with Playwright (or similar) for automated UI/end‑to‑end testing, and writing unit/integration tests for backend services.
Practical experience with agentic AI frameworks (e.g., LangChain, LangGraph, AutoGen, Semantic Kernel, or custom agent orchestration).
Proficiency in Python for scripting and AI service integration.
Hands‑on experience with AWS and/or GCP cloud platforms for deploying and managing application workloads.
Strong understanding of REST API design and service‑to‑service integration patterns.
Excellent problem‑solving skills and ability to work across the full stack, from UI to database, without silos.

Nice to have

Experience consuming LLM APIs (OpenAI, Anthropic Claude, Azure OpenAI, Bedrock, Vertex AI) within application workflows.
Experience with vector databases and RAG (Retrieval‑Augmented Generation) architectures as a consumer of these services.
Knowledge of containerization (Docker/Kubernetes).
Experience with prompt engineering and agent evaluation/observability tools.
Background in enterprise application modernization projects that incorporate agentic AI capabilities.