Senior Software Engineer

What Tank IsTank is financial AI + payments for the trillion-dollar logistics industry. We've quietly built the fastest growing network in freight payments, compounding >400% year-over-year for 3 years running. We put billions of dollars into the pockets of trucking companies—automating the data collection, approval, and reconciliation of millions of freight invoices per year. We're backed by top-tier Silicon Valley VCs, win industry awards & accolades, and serve a fiercely loyal customer base. We are post-product market fit and hiring to scale.Who We AreWe are a lean, elite team of builders and sellers working in person in Austin, TX. The founders have worked together for over a decade, including 4+ years at Amazon. We have backgrounds ranging from startups to high tech; from Wall Street to logistics industry insiders. We love hiring former founders, and future founders are even better.Who You AreAll in on AI—using state-of-the-art tools in your daily life and work—and can't miss the generational opportunity to bring AI into real world industry. 5+ years of experience as a full-stack or front-end software engineer. Proven track record in building highly scalable, reliable systems. Strong understanding of cloud infrastructure, web technologies, and modern frameworks. Entrepreneurial mindset with the ability to thrive in an early-stage startup environment. Comfortable with learning new technologies and adapting quickly to changing requirements. Collaborative, curious, and eager to work closely with other teams like product and design. Bonus points (but not required): Familiarity with our specific stack, fintech, or the logistics industry.Technical Challenges You'll Work OnYou will report directly to our co-founder and CTO. The roadmap moves fast, so within your first 90 days, you are guaranteed to work across multiple of the following dimensions:Advanced AI Models: Implement AI pipelines for intelligent document processing, payment optimization, risk assessment, and business infrastructure.Money Movement, at Scale: You'll build systems to securely and reliably move billions of dollars in payments, managing the complexity of financial transactions across multiple stakeholders.Operational Excellence: Optimize our systems to ensure high availability and fault tolerance, enabling 24/7 payments and avoiding downtime in mission-critical operations.Fraud Mitigation: Build real-time fraud detection and prevention mechanisms to safeguard our payment infrastructure and mitigate financial risk.Front-end and Back-end: Develop a seamless and intuitive user experience on both the client side and behind-the-scenes architecture, ensuring a responsive, scalable platform.You will work across a broad spectrum of technologies, from backend APIs to user-facing dashboards, providing variety and constant learning opportunities.We prefer technology agnostic, full-stack engineers, but this is our current stack: A Python microservices backend running serverless on AWS (Lambda, DynamoDB, CDK), a React/TypeScript/Next.js/Tailwind web app, and a Flutter mobile app. Payments run on a variety of payment infrastructure providers and banks, including Stripe; we use a variety of AI models for code generation, document processing, and business infrastructure.BenefitsCompensation: Competitive salary with flexible equity packages, allowing you to benefit directly from the company's growth.Healthcare: Comprehensive medical, dental, and vision coverage—100% covered by us with multiple plan options to suit your needs.Learning & Development: A collaborative environment focused on mentorship, with opportunities to grow rapidly in scope and impact as the company scales.In Person: We are building in-person in our HQ in downtown Austin! We believe that working together in the same space gives us a competitive edge, fostering deeper collaboration, faster problem-solving, and stronger team bonds. We love the energy of our office and believe it's key to building a world-class company.About the InterviewOur interview process is designed to be transparent, efficient, and give you a clear picture of Tank Payments. We'll give you an update within 48 hours of each step. Here's what you can expect:Intro Call: An informal conversation for you to learn more about the role and evaluate whether Tank Payments is a good fit (30 min, virtual).General Screen: Meet with one of our founders for a deep dive into your previous work and interests. We are looking for people who are interested in early-stage startups and are motivated to play a key role in their growth (60 min, virtual).Technical Screen: A coding challenge with a senior engineer to assess your problem-solving, testing, and debugging skills. You'll also get to learn about our engineering process and team dynamics (60 min, virtual).On-Site Interviews: Meet with each member of our founding team as well as a senior engineer for more in-depth conversations about your technical abilities and overall fit. This is your opportunity to see how you'd contribute to our mission and what it's like to be part of our team. 2 technical interviews, 2 non-technical (4 x 60 min, in person in Austin, TX).