Software Engineer - Platform (Frameworks, AI, Automation) Sr. Associate

The Role

This is a full-time role based in Austin, TX as part of Sixth Street's growing technology team. We are building and evolving a cloud‑native platform that enables teams across the firm to build, ship, and operate secure, scalable software. We are a lean, high-impact team where everyone wears many hats. We do not work in isolation; we are deeply connected with our developers to ensure the platform we build solves real-world problems. On our team, you will treat our platform as a product. You will be responsible for the "Golden Paths" that reduce cognitive load for our developers, while balancing technical excellence with deep developer empathy. You will work closely with our Infrastructure and Security teams on behalf of our developers and analysts who use our platform.

About Our Stack

• AWS-centric: Lambda, ECS (Fargate), RDS, S3, CloudFront, ElastiCache
• Infrastructure as Code: CDK for IaC, Terraform a plus
• Tooling: Ownership of GitOps and CI/CD tooling; GitHub Actions
• Backend: Python-centric (with some Java and Julia); Frontend: TypeScript/React
• Observability: OpenTelemetry standards and shared collectors
• AI: AI Gateway and shared AI platform services for secure model access and governance

Core Responsibilities

• Platform Strategy: Drive cross-team platform initiatives; facilitate alignment, adoption, and migration plans across the Engineering organization.
• Self-Service & DevEx: Build and evolve self-service platform capabilities (e.g., “Golden Paths”) that reduce cognitive load and accelerate delivery via templates, libraries, and sample applications.
• Mentorship & Standards: Mentor engineers, analysts, and non-technical stakeholders with empathy. Set high-bar engineering standards for platform codebases and practice a disciplined approach to problem-solving (SOLID, DDD, etc.).
• Product Mindset: Treat the platform as a product with active involvement in our roadmap, feedback loops with developers, documentation, and iterative UX improvements.
• Observability & Telemetry: Refine and optimize the org-wide instrumentation "Golden Path" for metrics, logs, and traces. Enable teams through high-quality documentation, examples, and targeted one-on-one partnering.
• AI Enablement: Evolve our AI platform capabilities, including AI gateway services and governance patterns. Use AI tools to plan, develop, and validate solutions as a key member of one of the firm’s primary AI teams.
• Deployment & Standards: In collaboration with our developers, evolve the GitOps and CI/CD tooling strategy. Encourage "Golden Path" deployment patterns, secrets management best practices, configuration, and runtime standards.
• Strategic Partnerships: Maintain a close partnership with the Security and Cloud Infrastructure teams to ensure platform patterns are secure and resilient.
• Operational Excellence: Help define the future of our platform’s reliability. This is an area ripe for ownership—you will have the opportunity to shape our evolving SLO/SLI strategy, incident response patterns, and on-call expectations.

Preferred

• 7+ years’ experience in professional software development. Degree in Computer Science or STEM field preferred.
• Curiosity and hunger to keep learning
• Excellent programming skills in a major programming language. Python experience strongly preferred
• Experience building internal platforms, shared services, or developer tooling
• Passion for CI/CD and shipping well-engineered code in a repeatable and reliable way.
• Experience designing RESTful APIs, and working with relational and “NoSQL” data stores
• Comfortable working in a Unix shell
• Strong sense of urgency; ability to execute quickly and efficiently with strong attention to detail
• Ability to collaborate effectively across multiple teams
• Strong prioritization and project management skills
• Comfort working in a high growth, iterative environment

What We Value

• Highly motivated, entrepreneurial, and team-oriented candidates with strong problem-solving skills
• Strong developer empathy and a passion for improving developer experience
• Team oriented and ability to influence through patterns, frameworks, and collaboration
• High Trust and Integrity
• Strategic / Entrepreneurial Mindset
• Strong organizational and communication skills
• Cross-team collaboration and the ability to operate across engineering, analytics, risk, and infrastructure functions

About Sixth Street

Founded in 2009, Sixth Street is a leading global investment firm dedicated to developing themes and offering solutions to companies across all stages of growth.
Our firm is designed for cross-platform collaboration at scale: we build businesses, invest for growth, acquire assets, provide direct financing, identify value in public markets, purchase royalty streams, and regularly develop first-of-their-kind structures to meet the strategic objectives of management teams.
We do all this globally and as one unified team of investment and control-side professionals working on behalf of our institutional investors and their beneficiaries around the world.
We believe adhering to our core values is a competitive advantage. Everyone on our team contributes their perspectives and expertise to help us solve complex challenges and get to the right answer. At Sixth Street, the best idea wins.

For more information, visit the Sixth Street Careers site or follow us on LinkedIn.

Sixth Street is proud to be an Equal Opportunity employer. We do not discriminate based upon race, religion, color, national origin, genetic history, marital status, gender (including pregnancy, childbirth, or related medical conditions), sexual orientation, gender identity, gender expression, age, veteran or military status, disability, genetic predisposition, status as a victim of domestic violence, a sex offense or stalking, or any other class or status in accordance with applicable federal, state and local laws.

Pursuant to the San Francisco Fair Chance Ordinance, Sixth Street will consider for employment qualified applicants with arrest and conviction records.   

If you need a reasonable accommodation to fill out this application, please contact Cindy Bombara.

Please refer to the privacy notice on our website for additional information regarding our obligations under the California Consumer Privacy Act (“CCPA”).

If you are not eligible for this role, please refer to our Careers Page for other opportunities.