Senior Full Stack Engineer Job Austin area,Texas USA,Software Development

Key Responsibilities Design & Development

Architect, build, and operate the full-stack services and user experiences that power loan origination, decisioning, and servicing our new Flagship Platform.
Ship features end-to-end across our stack:
Next.js on the front end, C# / .NET on the back end, PostgreSQL for data, and AWS ECS for infrastructure.
Translate complex financial and operational workflows into clean, performant, well-tested code that holds up under regulatory scrutiny and production load.

API & Platform Integration

Lead integrations with credit bureaus (Experian, Equifax, Trans Union), dealer systems (Dealer Track, Route One), fraud and verification providers, and other third-party partners including contract design, retry/idempotency strategy, and operational runbooks.
Extend and customize our existing DEFI Solutions loan originations platform – configuring workflows, scorecards, rules, and decision flows, and developing services that integrate with DEFI via REST APIs and operational data store (MSSQL).

Feature Ownership

Collaborate directly with Product, Design, and business stakeholders on features from problem framing through production rollout and post-launch iteration.
Drive observability, performance, reliability, and security across the services you own.

Code Quality & Engineering Practices

Set the patterns for testing, observability, security, and CI/CD that the rest of the team adopts.
Leverage AI-assisted development practices and tools (Copilot, Cursor, Claude Code, and similar) to accelerate delivery without sacrificing quality.
Run design reviews, give technical guidance, and help onboard the engineers who join after you.

Minimum Qualifications

Experience: 5+ years of professional software engineering experience.
Full Stack Depth: Production experience building and operating modern web applications across both front and back end. Expert-level proficiency in C# / .NET and a modern React-based framework (Next.js strongly preferred).
Data & APIs: Strong working knowledge of PostgreSQL (or a comparable relational database), RESTful API design, and SQL Server / T-SQL.
Cloud & Infrastructure: Hands‑on experience with AWS, including containerized workloads (ECS, EKS, Fargate or similar) and Docker.
Education: Bachelor’s degree in computer science, Engineering, or related technical field, or equivalent experience.

Preferred Qualifications

Direct experience working with or building on DEFI Solutions, or equivalent commercial Loan Origination Systems.
Auto finance, lending, or other regulated-industry domain experience.
Experience with event-driven architecture and AWS messaging services (SNS, SQS, Event Bridge, Kafka, or similar).
Experience integrating ML-driven decisioning, scoring, or underwriting models into production systems.