Senior FullStack Engineer

Posted 2 Days Ago
Hiring Remotely in Austin, Texas , USA
In-Office or Remote
Senior level
Software
The Role
Build and ship reliable features for a prepaid card and payments platform using AI-assisted development. Develop across backend, frontend, databases, cloud infrastructure, and payment integrations. Direct AI coding agents, review generated code, debug issues, write and validate tests, and identify financial, data-isolation, and transaction-integrity risks. The role requires hands-on work with C#/.NET, React, TypeScript, SQL, Azure services, mobile and partner applications, and payment-related integrations.
Summary Generated by Built In

This is a remote position.

About thinkbridge 

thinkbridge builds the business systems growing companies run on: ERP replacements, connected systems, AI agents inside real workflows and modernized legacy software. We have built custom software for growing companies for more than 12 years.

Today we deliver every system with thinkOne, our method that pairs our experts with our agentic engineering and delivery platform. The platform writes much of the code. Our people understand the client's business, work out the right solution and take it to production. A typical system goes live in about four months. Our commitments to clients are written into the contract before a build starts.

Why work at thinkbridge 

  • About 80% of the job is thinking and problem solving: the rest is building.
  • Our clients stay with us for four to five years on average, so you get to know their business well.
  • Part of the working week is set aside for learning, so it doesn't eat into your evenings.
  • You can move into a different role inside thinkbridge.
  • We are Great Place to Work Certified and have an employee NPS above 90. See what our people say and the industry firsts behind our certification.   
Benefits:
Benefits built for remote-first work
  • Work from anywhere. 
  • Shape your day around your life, as long as the work lands on time. 
  • Take time off when you need it. 
  • A work laptop of your own, set up the way you like it within our security guidelines. 
  • Weeks when the team gets together in person to work side by side. 
  • Learning time in working hours, and paid certifications. 

Five values guide how we build for clients and how we work with each other: Outcomes, Quality, Accountability, Communication and Care.

In practice:

  • We take software to production.
  • We check our work before anyone else has to.
  • We stand by our commitments.
  • We keep people informed in plain language.
  • We treat a problem as ours to solve.

We hire curious people who own the outcome.Meet the team that leads thinkbridge.

New graduates

thinkSchool is where graduates start their careers at thinkbridge.

Equal opportunity

thinkbridge is an equal opportunity employer. We hire on skills and character, and we treat every applicant fairly.

See all open roles

Questions about working at thinkbridge


Requirements

About Role: 

Experience Level: Mid-Level – Senior Full Stack Engineer with 4-6 year’s of experience with strong hands-on experience in C#/.NET (8-10), React, TypeScript/JavaScript, SQL, and API development. Experience using AI coding tools such as Claude Code, Cursor, Copilot, or Codex in real-world software development is required. 

Role Overview: We are looking for a 4–6 year's experience in Senior Full Stack Engineer with strong C#/.NET (8-10), React, TypeScript/JavaScript, SQL, Claude code and API development skills. Build and ship reliable features for a prepaid card and payments platform using AI-assisted development. Direct AI agents, review and improve code, debug issues, and validate changes through testing. Work across backend, frontend, databases, cloud infrastructure, and payment integrations. 

What You'll Do  

As part of the job

  • Ship changes with Claude Code. Write the plan, run the agents, review the diff, and prove the fix with tests: a negative test that fails without the change and passes with it, plus a test that the real user flow still works.
  • Catch what the AI gets wrong. Agents produce confident, plausible, broken code. In a payments system that means a double debit, a refund that never lands, or one customer reading another's data. Spotting that is the core skill of this role. 

What we're looking for

  • You already build this way. Claude Code, Cursor, Copilot or Codex: whichever it is, you've shipped real things with AI agents, not just tried them.
  • You can read code you didn't write and tell good from bad. This is non-negotiable. If you can't review the agent's output, you can't do this job. 
  • Enough C#/.NET, TypeScript/JavaScript and SQL to debug on your own when the agent is stuck or wrong, on both sides of an API call.
  • Many of our bugs sit exactly there: the server does one thing and the app assumes another. 
  • A careful instinct for money and data. You ask "what happens if this call times out after the money moved?" and "can this user reach someone else's card?" before you ask whether it compiles. 

Requirements: 

Must have technical skills   

  • Minimum 4-6 years of experience as Full Stack Engineer.
  • Backend: C# on .NET 8–10, Azure Functions (isolated worker) plus older layered ASP.NET APIs, EF Core and Dapper. 
  • Front end: React (web), React Native with TypeScript (iOS and Android), Angular with TypeScript (partner portal), on Node with Jest.
  • Data: MySQL, SQL Server, Cosmos DB, Azure Cache for Redis and queues. 
  • Infrastructure: Azure Functions and App Services, Key Vault, App Insights, Terraform, Bitbucket Pipelines, and private NuGet packages on Azure Artifacts. 
  • Integrations Card processors, payment and payout partners, identity verification, and SMS, email and push providers. 
  • Tooling: Claude Code as the primary development tool. 

Good to have skills 

  •  Payments or card-issuing experience, PCI awareness, and security review experience. 

thinkbridge  

there's a new way there. ™


Benefits

 Benefits built for remote-first work

  • Work from anywhere.
  • Shape your day around your life, as long as the work lands on time.
  • Take time off when you need it.
  • A work laptop of your own, set up the way you like it within our security guidelines.
  • Weeks when the team gets together in person to work side by side.
  • Learning time in working hours, and paid certifications.

Skills Required

  • 4-6 years of experience as a Full Stack Engineer
  • Strong hands-on experience with C# and .NET 8-10
  • Experience with Azure Functions isolated worker, older layered ASP.NET APIs, EF Core, and Dapper
  • Experience with React for web applications
  • Experience with React Native and TypeScript for iOS and Android
  • Experience with Angular and TypeScript for partner portals
  • Experience with Node.js and Jest
  • Experience with MySQL, SQL Server, Cosmos DB, Azure Cache for Redis, and queues
  • Experience with Azure Functions, App Services, Key Vault, Application Insights, Terraform, Bitbucket Pipelines, and Azure Artifacts
  • Experience developing and maintaining APIs
  • Real-world experience using AI coding tools such as Claude Code, Cursor, Copilot, or Codex
  • Experience integrating card processors, payment and payout partners, identity verification, and communications providers
  • Payments or card-issuing experience
  • PCI awareness
  • Security review experience
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The Company
Austin, Texas
343 Employees
Year Founded: 2014

What We Do

The year was 2014. Software development was becoming increasingly commoditized. Speed and cost issues were taking priority over strategy, execution, and long-term scalability. Growth-stage companies were getting caught in the middle of it all. If they turned to one of the many smaller dev shops that emerged, they wouldn’t get the strategic capabilities and thinking needed to make their project successful. But if they went with a big consulting firm, the costs would be prohibitive. That’s when a group of consulting and technology veterans came together over a new idea for software development. They knew that developers would get better results if they had more time to think through their projects before rushing straight to coding. And they wanted to start an employee-focused company that was all about enabling developers to do their best work. So they created a new model for outsourced development where developers would spend 80% of their time thinking about the solution and 20% coding it. This would give smaller companies the strategic thinking needed to compete with much larger corporations. Today, thinkbridge is how mid-market companies turn into tech disruptors, drive growth, and increase their valuations. Middle market leaders are no longer stuck between the limitless costs of big consulting firms and the limited capabilities of smaller dev shops. With a unique “think bigger, move faster, go further” approach to technology innovation, thinkbridge has achieved a client NPS rating in the 90s and a client retention rate of over 90%. thinkbridge. There’s a new way there Think Bigger | Move Faster | Go Further

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