Maximiliano Nielsen — Rosario, Argentina

Software that moves money.

I'm Maximiliano Nielsen, software engineer. I design and build the trading, payments and banking systems behind an Argentine fintech — and the infrastructure they run on. Co-founder & CTO of Hansen Labs.

maxi.a.nielsen@gmail.com GitHub ↗Download CV (PDF)

About

I'm a software engineer at LB Finanzas, an Argentine fintech, where I lead the business product line. Most of my work is backend: trading systems, payment flows, and the connectors that link the platform to banks, clearing houses and custody providers.

I also operate part of the platform itself — Kubernetes clusters, networking and CI/CD — so the services I design are services I also have to run.

I'm particularly drawn to distributed systems, event-driven and asynchronous patterns, and infrastructure. I'm completing a Computer Science degree at Universidad Nacional de Rosario, and I co-founded Hansen Labs, where we built Coliseo, the membership and access platform of Club Atlético Newell's Old Boys.

Experience

Nov 2021 — present

LB Finanzas ↗

Tech Lead, Business Products — joined as Jr. DevOps

Argentine fintech: trading, payments and fund management across crypto and traditional rails.

Technical lead of the business product line — the APIs that let companies and introducing brokers operate on the platform: architecture, API design and delivery coordination.
Design, build and operate banking connectors: US rails (ACH and wire transfers) and Argentine rails (CBU/CVU transfers over COELSA), plus Fireblocks for crypto custody.
Trading systems: order execution and swaps against external liquidity providers, and the routing of securities orders to US and Argentine markets.
Backend development on the payments services: deposit and withdrawal flows over fiat and crypto rails.
Operate three Kubernetes clusters and part of the platform's networking: ingress (Emissary/Envoy) and Netbird mesh VPN.
Maintain the build and deploy platform for the ~47 services: centralized base images, CI templates and GitLab CI + ArgoCD pipelines.

2026 — present

Hansen Labs ↗

Co-founder & CTO

We build Coliseo: memberships, payments and access control for Club Atlético Newell's Old Boys.

We took the product from zero to production in five months: memberships, billing, checkout and stadium access, live for one of Argentina's biggest football clubs.
Responsible for payments — installment billing and Mobbex checkout — and for the platform's deployment on Google Cloud, with Supabase as the database.
Built as a team: TypeScript monorepo, back-office, ticketing and NFC access verification at the stadium gates.

Earlier

Web Developer — Sistemas Integrados (2019)
Network Technician — ACD Networks (2018–2020)

Education

Computer Science (Licenciatura), Universidad Nacional de Rosario — in progress, thesis completed. Technical degree in Programming (2013–2019).

Research note

Co-author of “Visual-Inertial-GNSS Fusion with Distance Constraints” — a journal paper in preparation with CIFASIS (CONICET-UNR) and Universidad de Zaragoza, grown out of my undergraduate thesis on sensor fusion for agricultural robots.

Projects

confide ↗

shipped

End-to-end encrypted team secrets on top of Google Drive. age/X25519 + ed25519, self-updating CLI, no central key server.

dialin ↗

TypeScript

in progress

A PWA for dialing in espresso: shot logging, bean tracking, and adjustment suggestions from your own history.

okane ↗

Haskell

shipped

A small DSL for representing money movements, with a Parsec parser and a REPL.

Toolbox

Languages: Go · TypeScript · Ruby · C/C++ · Python · Haskell
Platform: Kubernetes · Google Cloud · Docker · GitLab CI · ArgoCD · RabbitMQ · PostgreSQL · Redis
Networking: Emissary Ingress · Envoy · Nginx · Netbird · gRPC
Observability: OpenTelemetry · Prometheus · Grafana · Jaeger · Elastic

Contact

Let's talk.

Based in Rosario, Argentina (UTC-3). Interested in hard problems across fintech, distributed systems and infrastructure.

maxi.a.nielsen@gmail.com GitHub ↗Download CV (PDF)