Sr. Backend Engineer

OMNICOMMANDER INC; Brentwood (TN); On-site; USD 90,000 - 110,000; Full time

Benefits offered by this job

Company Paid Holidays

PTO Days

Birthday PTO

Medical Insurance

Company Paid Life Insurance

401(k)

Job summary

OMNICOMMANDER INC is seeking a senior backend engineer to own REST APIs and backend services in a multi-tenant SaaS environment. You will design schemas, optimize data access in PostgreSQL, and run workloads on AWS with Docker and ECS/Fargate.

The role requires strong C# and ASP.NET Core expertise, experience with EF Core, and a track record of secure, scalable backend systems. On-site in Brentwood, TN or Santa Rosa Beach, FL, with competitive pay and benefits.

Qualifications

• 6+ years of senior backend engineering
• Strong C# and ASP.NET Core experience
• Hands-on PostgreSQL and EF Core skills
• Practical AWS production experience with containers

Responsibilities

• Own design, implementation, and maintenance of REST APIs and backend services using C#, ASP.NET Core, and EF Core.
• Design PostgreSQL schemas and migrations; optimize data access and transactions.
• Build workloads on AWS using Docker, ECS/Fargate, Lambda, S3, SQS, and related services.
• Engineer secure authentication and authorization, including JWT/OIDC and multi-tenant isolation.
• Implement resilient asynchronous workflows and integrations for assets and notifications.
• Deliver well-tested code through unit and integration tests, PRs, CI/CD, and safe deployment practices.
• Investigate production defects and performance issues using logs for root-cause analysis.
• Collaborate with Product/QA/Design; mentor teammates and communicate tradeoffs.
• Strengthen secure development practices and SOC 2 controls.

Skills

Backend development

C# ASP.NET Core

PostgreSQL

AWS

Security & multi-tenant SaaS

CI/CD

Unit/integration testing

Mentoring

Education

Bachelor's degree in Computer Science or related

Tools

Terraform

Docker

AWS (ECS/Fargate)

GitHub Actions

Job description

If you are unable to complete this application due to a disability, contact this employer to ask for an accommodation or an alternative application process.

Full Time Brentwood, TN, US

Nashville, TN, or Santa Rosa Beach, FL

Resumes must be submitted in English

OMNICOMMANDER is a fast-growing fintech company and three-time Inc. 5000 honoree. We lead the industry in digital branches and marketing, giving financial institutions a single platform to create, host, and manage their digital branch. We have offices in Tennessee, Florida, and Bogotá, Colombia. This is an on-site role based in Brentwood, TN, or Santa Rosa Beach, FL.

Salary Range: $90,000.00 To $110,000.00 Annually

Why You'll Love Working Here

Be part of a fast-growing fintech company with a fun, supportive culture.

Work in a dynamic, high-tech environment with hands-on experience working with AI.

Competitive pay and comprehensive benefits, including paid holidays, PTO, an additional day of birthday PTO, company-paid life insurance, and 401(k) with employer match.

Global team with offices in Tennessee, Florida, and Bogotá, Colombia.

Key Responsibilities

• Own the design, implementation, maintenance, and evolution of REST APIs and backend services using C#, ASP.NET Core, and Entity Framework Core.
• Design PostgreSQL schemas and migrations; improve data access, query performance, transactions, and concurrency behavior.
• Build and support workloads on AWS using Docker, ECS/Fargate, Lambda, S3, SQS, and related services as appropriate.
• Engineer secure authentication and authorization, including JWT/OIDC, role-based access controls, least-privilege permissions, and strict tenant isolation.
• Implement resilient asynchronous workflows and integrations for assets, notifications, publishing, and other platform operations.
• Deliver well-tested code through unit and integration tests, GitHub pull requests, CI/CD pipelines, and safe deployment and rollback practices.
• Investigate production defects and performance issues; use logs and operational evidence to identify root causes and prevent recurrence.
• Collaborate with Product, QA, Design, and engineering peers; review designs, mentor teammates, and communicate tradeoffs clearly.
• Strengthen secure development practices, documentation, audit trails, and repeatable controls that support SOC 2 readiness.

What We Are Looking For

• Senior-level engineering experience, 6+ years or equivalent demonstrated expertise, with substantial ownership of production backend systems.
• Advanced C# and ASP.NET Core experience, including modern .NET, asynchronous programming, dependency injection, API design, error handling, and maintainable architecture.
• Strong hands-on PostgreSQL and Entity Framework Core skills, including schema evolution, query optimization, data integrity, and safe migrations.
• Practical AWS production experience, including containerized workloads, IAM, service configuration, monitoring, and troubleshooting.
• Experience building secure, multi-tenant SaaS applications and implementing authentication, authorization, and defense-in-depth protections.
• Evidence of automated testing, Git-based code review, CI/CD ownership, and debugging complex production issues.
• Strong written and verbal English communication (B2 level or higher), sound technical judgment, and experience mentoring engineers.
• Experience working with Terraform or other infrastructure-as-code tools; AWS CloudFront, Secrets Manager, KMS, WAF, or Step Functions is a plus.
• Experience with SignalR/WebSockets, Redis, DynamoDB, event-driven systems, or advanced observability is a plus.
• Experience with Python or Rust for supporting services; Amazon Bedrock, AI integrations, or vector search is a plus.
• Fintech or enterprise SaaS experience, secure SDLC practices, and familiarity with SOC 2-oriented evidence and controls are highly desirable for this role.

Benefits: (waiting period may apply)

• Company Paid Holidays
• PTO Days (Paid Time Off)
• PTO Day for your birthday
• Medical Insurance
• Company Paid Life Insurance
• 401(k)

Job Type: Full-time

A criminal background check is required.