Senior Full-Stack Engineer — Scale Payments & APIs

Sound Decisions; United States; Hybrid; USD 150,000 - 210,000; Full time

Benefits offered by this job

401k & Roth IRA

Monthly workspace reimbursement

Work-from-home expense reimbursement

Unlimited vacation

Job summary

Sound Decisions is seeking a seasoned, full-stack software engineer in the United States. You will engage in multi-language production systems, participate in high-level architecture discussions, and contribute to scalable merchant payment technologies.

You will collaborate with senior engineers, lead initiatives, and grow into management responsibilities while practicing disciplined use of AI tools and maintaining strong code quality across teams.

Qualifications

• 10+ years of professional software engineering experience.
• Strong knowledge of Scala or another functional programming language and the ability to apply functional programming concepts in production systems.
• Full-stack development experience across frontend, backend, APIs, data, and integrations.
• Experience developing with TypeScript and familiarity with modern web application development.
• A firm foundation in computer science principles and a decent level of maturity in AI coding tools.
• The ability to operate multiple sessions, handling/ preventing collisions, the patience to work out a plan before jumping in, and the wisdom to prevent AI side quests.
• The ability to manage up and a desire to later on develop your management skills.

Responsibilities

• Develop software across multiple projects and languages.
• Maintain existing systems and deliver new features in a full-stack capacity.
• Translate customer, product, and business workflow needs into practical technical solutions.
• Prototype new products and integrations, including reference implementations and UML-based integration mappings.
• Design and implement maintainable APIs, user-facing functionality, and supporting services.
• Create and maintain clear User Guides, API documentation, reference implementation documentation, and technical decisions.
• Write unit, functional, and automated tests and use them to maintain confidence in releases.
• Use AI tools to accelerate research, design exploration, coding, debugging, documentation, and test creation while validating all generated output.
• Participate in code reviews and provide constructive feedback that improves quality and team learning.
• Follow the concepts of an agile process, including iterative delivery, prioritization, and continuous improvement.
• Communicate clearly with engineering, product, solutions, sales, and other stakeholders.

Skills

Scala

Functional programming

Full-stack development

TypeScript

AI tooling awareness

Managing up

Leadership potential

Tools

Kubernetes

Docker

Job description

Sound Decisions is seeking a seasoned, full-stack software engineer in the United States. You will engage in multi-language production systems, participate in high-level architecture discussions, and contribute to scalable merchant payment technologies.

You will collaborate with senior engineers, lead initiatives, and grow into management responsibilities while practicing disciplined use of AI tools and maintaining strong code quality across teams.