Intermediate Software Engineer

About the Company

Named a Forbes Fintech 50, Stronghold’s mission is to improve financial access by powering innovative payment and financial services solutions through our open APIs. We’ve been going deep to lay the underlying rails for modern payments and reach all customers with secure, transparent ways to move money.

We are seeking team players who can evolve with the company as we scale and add new products. We are a team of technologists and industry experts who take a data-driven and innovative approach to solving problems. We power possibilities for our customers by bringing the best talent together in an open and collaborative work environment that rewards curiosity and grit.

Stronghold is proud of its SF Bay Area and New Zealand roots and strives to build a diverse team to serve our ecosystem better while staying true to our core values. Our core values are to Be Self Aware, Have Good Judgment, Be Curious, Seek Innovation, Excellent Communication, High Impact, Be Bold, Be Selfless, Be Accountable, Be Honest, and Show Grit.

About the Role

As a member of our engineering team, you will contribute to architecting, developing, and maintaining our payments API platform and blockchain projects. A significant portion of our codebase is written in C# with .NET Core, supported by CI/CD pipelines automated through GitLab. We prioritize efficient and comfortable tooling, providing you with a MacBook, Slack/Zoom for communication, JetBrains IDEs, GitHub Copilot, and more to streamline your work. You’ll work alongside product management and customer-facing teams to help address customer challenges and implement scalable, innovative solutions.

In this role, you will help drive growth and innovation in our decentralized finance and payments products by developing and optimizing software across a range of technologies. You’ll be responsible for backend development, system scalability, and performance optimization. This position offers the chance to gain hands-on experience with diverse projects—from system design and new feature launches to tech debt reduction, user interface design, and server-side performance enhancements.

You’ll be part of a collaborative, experienced team with a mix of startup and established company backgrounds, providing support and mentorship as you grow your skills and impact within the organization.

What You'll Do

- Maintain Stronghold's Platform APIs, working on solving payment problems for our enterprise customers and underserved businesses utilizing .Net, Go, Rust, Node.js and frontend JS frameworks.

- Be involved with all aspects of the development process for Platform projects - from vision to final implementation.

- Support new Platform functionality with the corresponding APIs for external developers.

- Receive, prioritize, and help solve technical problems from Stronghold's Platform API customer base.

- Collaborate with the Stronghold engineering team on code reviews and design, supporting engineering excellence across the team.

- Support automated testing, infrastructure development, and the establishment of scalable standards.

- Work across customer segments, problem types and time horizons on a wide-variety of initiatives.

What We're Looking For

- You have 6+ years of experience developing software on a team.

- You’re proficient in languages such as .NET and/or Go, with SQL expertise. Knowledge of Node.js or Rust is a nice-to-have.

- Experience in building frontend user interfaces and single-page web applications with TypeScript/JavaScript using React.js and Next.js. Knowledge of other frameworks, such as Angular, Vue, or Svelte, is also considered.

- Familiarity with building and maintaining APIs open to external developers.

- You are knowledgeable of existing frameworks and open source tools.

- You have a BSc or MSc in Computer Science or an equivalent experience.

- Experience with Postgres, Kubernetes, Docker, Cloudflare, Terraform, Redis, Git, GitLab/GitHub, DataDog, Sentry and Google Cloud platform (Azure or AWS is also considered).

- You're enthusiastic about working on a small, growing team where you'll be given a lot of autonomy.

- You're a great communicator that can advocate and lead technical discussions, especially during the design and code review process.

- You learn quickly and strive for simplicity.

- You're open, empathetic, and care about putting the best ideas forward in a collaborative and helpful manner.

- Good to have experience working in financial institutions, especially in payments including VIsa/MC, US ACH & wires, CA Interac, and cross-border wires.