Senior Software Engineer - Foundations

LemFi; New York (NY); Remote; USD 140,000 - 200,000; Full time

Job summary

LemFi is building a global fintech platform with a focus on the Global South. We’re seeking a senior backend engineer to own identity, onboarding, and platform services that other squads rely on.

You’ll design scalable Go-based systems, build internal SDKs, and shape API contracts while collaborating with cross-functional teams to raise reliability and developer experience in a fast-growth startup.

Qualifications

• At least five years of backend engineering with Go in production.
• Experience building and scaling distributed systems at scale.
• Experience with platform/enablement teams: shared libraries, internal tooling, developer experience or API gateways.
• Full lifecycle ownership: design, build, operate, improve.
• Practical use of AI development tools in daily workflow.
• Strong opinions on system design, API contracts and service boundaries.
• Nice to have fintech/payments or identity/KYC exposure.
• Experience building SDKs or developer-facing platform services.
• Prior work in a high-growth startup (50-500 people).

Responsibilities

• Own and evolve core identity and onboarding services (KYC flows, verification orchestration).
• Build and maintain internal SDKs and shared libraries that abstract platform concerns (auth, identity, caching, eventing).
• Define and champion cross-platform architectural standards, API contracts and data consistency.
• Drive engagement platform capabilities: rewards logic, CRM integrations and LFI cache.
• Partner with platform and infrastructure teams to improve reliability and observability across Foundations-owned services.
• Tackle hard problems: new country launches, regulatory identity requirements, scaling events.
• Contribute to a high-ownership engineering culture: code reviews, incident response and mentoring.

Skills

Go backend

Distributed systems

Platform tooling

End-to-end ownership

AI tooling

API contracts

SDKs / developer platforms

Fintech / payments / KYC

Startup / scale-up experience

Job description

LemFi (Series B) is building the go-to financial app for the Global South.

Moving to a new country shouldn’t mean starting from zero. That's why our team of 400+ spanning 20+ countries is building a financial ecosystem that helps immigrants stay connected to home, build stability, and create wealth regardless of where they are from or where they live.What began as fast, affordable remittances is now evolving into a complete platform for multi-currency accounts, payments, credit, and long-term financial growth.With millions of users across the globe, we process over $1B in monthly transactions to 30+ countries, proving that borders shouldn't limit financial opportunity.

About the role

LemFi's Foundations tribe is the platform backbone every product team relies on. We own onboarding and identity (KYC end-to-end), engagement systems (rewards, CRM tooling, LFI cache), and the internal SDKs and architectural standards that let other squads move fast without reinventing the wheel. If it touches how a customer gets onto the platform or how teams build reliably on top of it, it runs through us.

What you'll build and own

Own and evolve our core identity and onboarding services - KYC flows, verification orchestration and the data contracts that downstream systems depend on.Build and maintain internal SDKs and shared libraries that abstract platform concerns (auth, identity, caching, eventing) so product teams can move without friction.Define and champion cross-platform architectural standards, making opinionated decisions about service design, API contracts and data consistency that the wider engineering org follows.Drive engagement platform capabilities - rewards logic, CRM integrations and LFI cache - from spec to production, using AI-assisted development tooling to compress iteration cycles without sacrificing correctness.Partner closely with platform and infrastructure teams to raise the reliability and observability bar across Foundations-owned services.Tackle the hard, ambiguous problems - new country launches, regulatory identity requirements, scaling events - and turn them into clean, well-documented solutions.Contribute to a high-ownership engineering culture: code reviews, architectural reviews, incident response and mentoring are part of the job, not extras.

Your experience

At least five years of backend engineering experience with Go as your primary language in a production environment.A track record of building and scaling distributed systems - you have seen things break at scale and know how to design so they do not.Experience working on or closely with platform or enablement teams: shared libraries, internal tooling, developer experience or API gateways.Comfortable with the full lifecycle - design, build, operate, improve - with evidence of genuine end-to-end ownership rather than handing off to other teams.Practical, demonstrable use of AI development tools in your daily engineering workflow; you validate AI output rather than blindly accepting it.Strong opinions about system design, API contracts and service boundaries, backed by real examples you can walk us through.Nice to haveExposure to fintech, payments or identity/KYC systems.Experience building SDKs or developer-facing platform services consumed by other engineering teams.Prior work in a high-growth startup or scale-up (roughly 50-500 people) where you had to set standards, not just follow them.

Why Join LemFi?

Love shouldn’t be expensive, yet those working hardest for their families often face predatory fees and banking exclusion. We're changing this.At LemFi, you won’t be just a cog in a machine. Whether designing products, scaling operations, or telling our story, you’ll tackle complex challenges with real, immediate impact.Your work goes beyond metrics - it puts money back in families’ pockets and offers access to the previously excluded. Join us to make a meaningful difference, where high performance is a lifeline for millions.

You can connect with us on [LinkedIn]( and [Instagram]( and if you haven't already, download the app on the [App Store]( or [Google Play](")