Fullstack Engineer

Koalafi

Fullstack Engineer responsible for integrating systems and developing APIs for a Non-Prime Installment Loan product at Koalafi. Working with a cross-functional team to enhance our financing options.

Posted 6/1/2026full-timeRemote • Virginia • 🇺🇸 United StatesJuniorMid-LevelWebsite

Tech Stack

Tools & technologies

AWSCloudGoKubernetesMicroservicesReactTypeScript

About the role

Key responsibilities & impact

Implement microservices and event-driven workflows to integrate Koalafi's systems with a third-party loan servicing platform
Build and maintain REST APIs that support loan origination, payment processing, and customer servicing operations
Navigate and contribute to existing internal services where the NPIL product intersects with current Koalafi systems — reading unfamiliar code, understanding its intent, and making clean, well-scoped changes
Develop frontend components in React/TypeScript to support customer-facing and internal tooling as needed
Write code that is testable, observable, and built to last — not just built to ship
Work closely with the Tech Lead on system design and integration architecture
Partner with Product and Compliance to understand requirements and translate them into reliable, compliant implementations
Participate in code reviews — both giving and receiving feedback with the goal of raising the bar, not just checking a box
Engage actively in sprint ceremonies: planning, retros, standups — contribute to the team's rhythm, not just your own ticket
Implement monitoring and alerting at integration points so issues surface before customers notice them
Support audit logging and data reconciliation requirements inherent to a regulated financial product
Identify and flag technical risk early — bad news early is always better than bad news late
Leverage AI development tools to move faster and stay consistent with team patterns

Requirements

What you’ll need

2–4 years of professional software engineering experience
Hands-on experience building backend services in Golang
Working knowledge of REST APIs, HTTP/JSON patterns, API authentication including bearer tokens and OAuth flows and API Testing tools like Postman, HTTPPIe
Experience building or contributing to frontend applications; React/TypeScript preferred
Familiarity with AWS, Kubernetes, and cloud-native deployment patterns
Familiarity with observability concepts and tools like Dynatrace
Familiarity with AGILE/Scrum principles, ceremonies and JIRA
Solid testing instincts — unit, integration, and contract testing aren't afterthoughts for you
Comfort navigating and contributing to unfamiliar codebases — not just greenfield builds
Strong communication skills: you can explain what you're building and why, not just how

Benefits

Comp & perks

Comprehensive medical, dental, and vision coverage
20 PTO days + 11 paid holidays
401(k) retirement with company matching
Student Loan & Tuition Reimbursement
Commuter assistance
Parental leave (maternal + paternal)
Inclusion and Associate Engagement Programs

ATS Keywords

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Applicant Tracking System Keywords

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Hard Skills & Tools

microservicesevent-driven workflowsREST APIsGolangReactTypeScriptAPI authenticationunit testingintegration testingcontract testing

Soft Skills

communicationcollaborationcode reviewproblem-solvingrisk identificationfeedbackteam contributionadaptabilityattention to detailcritical thinking