11 backend net developer jobs at 7 companies in Oceanside, CA

1mo
Save
Mark Applied
Hide
Senior Software Engineer, Back-End (Payments)
United States or Santa Ana or San Francisco or Oakland or Berkeley or New Jersey or Texas or Florida or Shanghai or Hong Kong or Japan or Canada or Mexico or Germany or France
$141k-$229k/yr HybridFull Time
Collectors
Collectors: Providing authentication and grading services for high-value collectibles.
6+ YOE6+ years engineering experience, deep C#/.NET backend skills, frontend experience with React/Svelte/TypeScript, payments/gateway and distributed-systems experience, observability and security mindset.
Stripe, PayPal, C#, .NET, React, Svelte, TypeScript, PostgreSQL, DynamoDB, Kafka, Kubernetes, AWS, Datadog
3w
Save
Mark Applied
Hide
Full-Stack .NET/Mobile Developer
San Diego, California, United States
$90k-$130k/yr OnsiteFull Time
Applications International Corporation
Applications International Corporation: Delivers cloud-based environmental health, safety, and ESG compliance software.
5+ YOE5+ years full-stack .NET experience, 3+ years mobile (.NET MAUI/Xamarin), ASP.NET/C# backend, REST API and SSO experience, Azure and CI/CD familiarity, bachelor’s degree or equivalent preferred.
.NET MAUI, Xamarin, ASP.Net, MVC, C#, VB.Net, SSIS, Azure, Visual Studio, Git, Azure DevOps, GitHub Actions, SQL Server, OAuth 2.0, OpenID Connect, SAML
2w
Save
Mark Applied
Hide
Senior Software Engineer
San Diego, California, United States
$124k-$187k/yr HybridFull Time
CoStar Group
CoStar GroupNASDAQ: CSGP: Provides global real estate information, analytics, and online marketplaces.
Bachelor's degree required. Strong C#/.NET experience, hands-on AWS, experience using Claude for AI-assisted development, API and backend development skills, software design and mentorship experience.
C#, .NET, .NET Core, Claude, AWS, EC2, ECS, EKS, Lambda, S3, RDS, DynamoDB, CloudWatch, Databricks, Terraform, CloudFormation, CDK, Git
3w
Save
Mark Applied
Hide
LoopNet - Senior Software Engineer
Irvine, California, United States
$124k-$187k/yr HybridFull Time
CoStar Group
CoStar GroupNASDAQ: CSGP: Global provider of commercial and residential real estate data.
7+ YOE7+ years production C#/.NET development, bachelor's degree, experience building APIs/backends, testing, cloud (AWS) experience, mentoring, and familiarity with AI coding tools.
C#, .NET, .NET Core, Claude Code, GitHub Copilot, Vue.js, React, TypeScript, Microsoft SQL, MySQL, AWS S3, SQS, DynamoDB, ElastiCache, Apache Kafka, Datadog, Docker, Kubernetes, CI/CD, BigQuery, Databricks, Snowflake, Python
3w
Save
Mark Applied
Hide
LoopNet - Senior Software Engineer
Irvine, California, United States
$124k-$187k/yr HybridFull Time
CoStar Group
CoStar GroupNASDAQ: CSGP: Provides global real estate information, analytics, and online marketplaces.
7+ YOEBachelor's degree,7+ years production C#/.NET development,AWS experience,unit and automated testing,API/backend design,mentoring experience,experience with AI coding tools (Claude Code or GitHub Copilot).
C#, .NET, .NET Core, Claude Code, GitHub Copilot, Vue.js, React, TypeScript, Microsoft SQL, MySQL, AWS, S3, SQS, DynamoDB, ElastiCache, Apache Kafka, Datadog, Docker, Kubernetes, CI/CD, BigQuery, Databricks, Snowflake, Python
2w
Save
Mark Applied
Hide
Senior Software Engineer
San Diego, California, United States
$124k-$187k/yr HybridFull Time
CoStar Group
CoStar GroupNASDAQ: CSGP: Global provider of commercial and residential real estate data.
Bachelor's degree required; strong C#/.NET and AWS experience; hands-on use of Claude preferred; experience building cloud-native, scalable backend services; Git and CI/CD familiarity.
C#, .NET, .NET Core, Claude, AWS, EC2, ECS, EKS, Lambda, S3, RDS, DynamoDB, CloudWatch, Git, Databricks, Terraform, CloudFormation, CDK
2mo
Save
Mark Applied
Hide
Senior Software Engineer (Databricks)
San Diego, California, United States
$124k-$187k/yr HybridFull Time
CoStar Group
CoStar GroupNASDAQ: CSGP: Global provider of commercial and residential real estate data.
Bachelor's degree required; strong C#/.NET and AWS experience, hands-on use of Claude, Databricks preferred, experience building APIs/backend services, Git workflows, CI/CD and IaC familiarity.
C#, .NET, .NET Core, Claude, AWS EC2, AWS ECS, AWS EKS, AWS Lambda, AWS S3, AWS RDS, AWS DynamoDB, AWS CloudWatch, Databricks, Git, CI/CD, Terraform, CloudFormation, AWS CDK
2mo
Save
Mark Applied
Hide
Engineer II, Cloud & Web Systems Software
Irvine, California, United States
$100k-$120k/yr OnsiteFull Time
Masimo
MasimoNasdaq: MASI: Develops noninvasive patient monitoring technologies and consumer audio products.
2+ YOEBachelor’s degree in CS/Software Engineering or related field; 2-5 years in cloud/web/backend or distributed systems; strong programming with C#, .NET, Java, Python, JavaScript/TypeScript; cloud platforms (AWS/Azure/GCP); APIs, microservices, databases; CI/CD; Agile; good communication.
C#, NET, Java, Python, JavaScript, TypeScript, React, Angular, Node.js, AWS, Azure, Google Cloud Platform, SQL Server, PostgreSQL, MongoDB, CI/CD, Docker, Kubernetes
1mo
Save
Mark Applied
Hide
Software Engineer Full Stack (Pricing Engine)
Irvine, California, United States
$90k-$134k/yr HybridFull Time
Xe
XeNASDAQ: EEFT: Provides international money transfers and online currency exchange services.
3+ YOE3+ years building production web applications; strong frontend with Vue.js or React; backend proficiency in C#/.NET (or Java/Kotlin/Go); SQL and AWS (SQS, DynamoDB, S3, ECS, Lambda); writing tests and using agentic coding tools.
Vue.js, React, C#, .NET, Java, Kotlin, Go, SQL, Copilot, Cursor, Claude Code, AWS, SQS, DynamoDB, S3, ECS, Lambda, Memcached, Redis, Jira, Confluence, Postman, Bruno
2w
Save
Mark Applied
Hide
Senior Engineer, Full-Stack
Temecula, California, United States
$145k-$160k/yr OnsiteFull Time
FFF Enterprises
FFF Enterprises: Distributes specialty biopharmaceuticals and manages critical healthcare inventory.
7+ YOEBachelor's degree, 7+ years full-stack SaaS experience, proficiency with Azure and cloud-native architectures, backend (.NET), frontend (React/Angular), SQL/data modeling, security and healthcare compliance (PHI,21 CFR Part 11).
Azure, App Services, Functions, AKS, .NET, React, Angular, GraphQL, SQL, FHIR, HL7, CI/CD
6d
Save
Mark Applied
Hide
AI Integration Architect
Milwaukee or Irvine or Dallas or Austin or United States
$134k-$200k/yr OnsiteFull Time
Cotality
Cotality: Provider of property intelligence, data, and analytics solutions.
7+ YOE7–10 years software engineering/architecture experience building LLM-powered or agentic AI applications; strong backend skills (Python/Java/.NET); API, security, and CI/CD experience; familiarity with agentic frameworks and AI observability.
LangChain, LlamaIndex, AutoGen, Python, Java, .NET, OAuth 2.0, JWT, Apigee, Kong, MCP, LiteLLM, Snowflake, Databricks, GCP, Docker, Kubernetes, Terraform, NVIDIA Device Plugins, CUDA, ROCm, vLLM, Triton