JOB SUMMARY:We are seeking a Senior Software Engineer - API & Integration Lead to serve as the engineering lead for Ensemble 2.0, a business-critical integration platform that connects external partners with Greentech and CED systems. Working closely with the Principal Software Engineer / Architect and Product Owner, this role will translate architecture into production-ready C#/.NET services, establish reusable API, SQL Server, and integration patterns, and guide the phased migration of legacy workflows. The ideal candidate combines deep hands-on engineering skill with the judgment and communication needed to mentor teammates and build services that are reliable, observable, auditable, and supportable.
REPORTS TO:Ensemble Product Owner
MINIMUM QUALIFICATIONS:- Bachelor's degree in Computer Science, Information Systems, Engineering, or an equivalent combination of education and professional experience.
- 7+ years of professional software development experience, including substantial work on enterprise APIs, integration platforms, or distributed business systems.
- Strong hands-on experience with C#, ASP.NET Core, SQL Server, REST APIs, JSON contracts, and OpenAPI/Swagger. Experience implementing data-access repositories using parameterized SQL and stored procedures is highly preferred.
- Strong SQL Server experience, including relational data modeling, stored procedures, transactions, indexing, query tuning, and data-integrity controls.
- Experience designing or operating production integrations that use message processing, asynchronous workflows, or background services.
- Practical understanding of authentication, authorization, API versioning, idempotency, retries, deduplication, correlation IDs, structured logging, and observability.
- Experience supporting business-critical production systems and diagnosing issues across application logs, API payloads, and database records.
- Strong written and verbal communication skills, including the ability to explain design decisions, give constructive code-review feedback, and collaborate across Product, QA, Support, and Architecture.
PREFERRED QUALIFICATIONS:- Experience with Azure DevOps, CI/CD pipelines, App Services, Azure Functions, Service Bus, Key Vault, Application Insights, or comparable platform tooling.
- Experience with SQL Service Broker, SQL-backed queues, background workers, or other asynchronous processing patterns.
- Experience analyzing, documenting, and migrating legacy business applications. Experience modernizing Node.js, JavaScript, TypeScript, or similar systems into .NET-based architectures is highly desirable.
- Experience with file-based integrations such as CSV, remittance, EDI, or scheduled data ingestion.
- Experience working with business-critical integrations, financial transactions, operational workflows, or large-scale data migrations. Prior experience in distribution, finance, renewable energy, ERP, or logistics environments is helpful but not required.
- Experience with API contract testing, automated regression testing, performance testing, and production-readiness gates.
- Previous technical-lead or mentoring experience, particularly on a small product engineering team.
WORKING CONDITIONS:Remote
COMPENSATION RANGE:The compensation range for this position is 150000 to 170000 annually
OTHER COMPENSATION:The following additional compensation may be applicable for this position:
BENEFITS:Benefits available for this position are:
- 401(k) (18 or older)
- Paid Sick Leave (Full-Time)
- Paid Sick Leave (Part-Time) - per your State's requirements
- Insurance (Full-Time) - Medical, Dental, Vision Care
- Insurance (Part-Time) - Medical only (30+ hours/week)
- Disability Insurance
- Life Insurance
- Paid Holidays
- Paid Vacation
- Paid Pregnancy & New Parent Leave
- Health Savings Account (HSA) and matching
- Dependent Care Flexible Spending Account (FSA)
- Teledoc
ESSENTIAL JOB FUNCTIONS:- Partner with the Principal Software Engineer / Architect to implement system boundaries, migration strategy, technical standards, and production-readiness requirements.
- Establish and demonstrate reusable patterns for C#, ASP.NET Core, SQL Server, background processing, and partner integrations.
- Design and build secure, versioned APIs and SQL-backed workflows that exchange business-critical data with internal and external systems.
- Define and implement payload validation, authentication, authorization, error handling, retry and replay behavior, duplicate prevention, audit trails, and correlation across services.
- Analyze, document, and migrate legacy business logic into centralized, testable, and maintainable services while ensuring behavioral parity with existing production workflows.
- Lead technical implementation for complex workflows involving projects, milestones, invoices, credits, remittance activity, and related operational data.
- Review code and technical designs; mentor engineers through documentation, implementation examples, pairing, and actionable feedback.
- Collaborate with Product, QA, and Support to refine acceptance criteria, identify edge cases, improve testability, and determine release readiness.
- Troubleshoot production and pre-production issues using logs, traces, payloads, database records, and monitoring data; drive durable corrective action.
- Create and maintain technical documentation for integration contracts, implementation patterns, operational behavior, and support procedures.
