Senior Python Developer (Fullstack, Be-Heavy)

Proxify; Rosario; A distancia; ARS 139.086.000 - 231.811.000; Jornada completa

Ventajas ofrecidas por este puesto de trabajo

Fully remote contract role

US core hours

Own end-to-end product area

AI-first delivery culture

Start in early November

Descripción de la vacante

UBQ.io is seeking a Python Finance Developer to join our remote team and help build an internal web platform that supports portfolio management for our finance and operations teams. You will own features end to end, translating financial methodologies into backend logic, optimizing queries, and ensuring data accuracy across systems.

Strong English communication is essential for collaboration with global stakeholders.

Formación

• 4+ years building full-stack web applications
• Experience with codebases you didn’t write, learning conventions
• React, TypeScript and SQL on Azure, including schema design and migrations
• Daily use of AI coding tools with tests behind CI
• Clear written and spoken English

Responsabilidades

• Design, build and maintain platform features for portfolio management
• Translate financial methodologies into backend logic
• Write and optimise SQL queries against cloud data warehouse
• Ensure figures reconcile against source systems and reporting
• Collaborate with finance and operations to gather requirements and deliver improvements

Conocimientos

English proficiency

Problem solving

Educación

MSc in Finance

CFA/CAIA Level I or equivalent

Herramientas

React

TypeScript

SQL on Azure

AI coding tools (Cursor/Claude Code)

CI/CD tooling

Descripción del empleo

Python Finance Developer (100% Remote Worldwide)

About UBQ.io
UBQ.io is a global technology service provider dedicated to building a more sustainable, independent, and equitable future. We partner with global companies across industries, including AI, blockchain, software, biotech, and education, to transform bold ideas into real, meaningful solutions.

Our expertise spans technology consulting, AI and Machine Learning development, Blockchain integration, and global team collaboration. With a worldwide network of specialists, we help organizations stay ahead in a rapidly evolving digital landscape.

At UBQ.io, we don’t just advise, we collaborate. Our commitment to innovation, sustainability, and social responsibility guides everything we do as we help clients build technologies that empower people, communities, and industries to thrive.

About the role

We are looking for a Finance Developer to join our team and help build an internal web platform that supports portfolio management for our finance and operations teams. Working at the intersection of

finance and technology, you will turn financial data and business requirements into accurate, reliable tools. You will own features from end to end, from data queries and calculation logic through to the user interface.

What you'll do

Design, build and maintain platform features, including summary metrics, interactive tables and data visualisations.

Translate financial methodologies such as valuation, P&L attribution, exposure and cost basis into clean, well-tested backend logic.

Make sure every figure reconciles accurately against source systems and existing reporting.

Write and optimise SQL queries against our cloud data warehouse.

Keep the platform fast and reliable through caching, performance tuning and robust error handling.

Work closely with finance and operations stakeholders to gather requirements, validate results and deliver improvements.

Our stack

Backend: Python, FastAPI, Pydantic, Google BigQuery, Redis

Frontend: React, TypeScript, Vite, TanStack Query, Recharts, Tailwind CSS

Solid professional experience with Python, including building backend services or data applications.

A good understanding of financial concepts: positions, P&L (daily, MTD, YTD, ITD), NAV, exposure and cost basis.

Comfort writing non-trivial SQL, ideally on BigQuery or another cloud warehouse.

A strong eye for detail and a habit of testing and reconciling numbers until they're right.

Clear communication, and the confidence to challenge and clarify requirements with finance teams.

A MSc in Finance, or progress towards a professional qualification such as CFA or CAIA (Level I or above), or equivalent.

Advantageous

• Front-end experience with React and TypeScript, especially data-heavy UIs.
• Experience with BI and reporting tools, or building analytics dashboards.
• A background in asset management, fund administration, treasury or fintech.
• Familiarity with multi-asset portfolios, e.g. equities, fixed income, digital assets and commodities.
• Experience with Google Cloud and caching strategies.
• Semi Senior
• Senior
• FastAPI
• SQLAlchemy
• Docker
• Git
• RabbitMQ / Kafka / Celery / Redis Queue
• Contractor
• Full-time
• Argentina
• Nota

Our client is a remote product studio that builds MVPs and custom software for startups and companies past the idea stage. Clients hire them for a fixed-scope MVP or for a product team billed by the two-week sprint, and the whole team uses AI coding tools every day.

They've been at it since 2020 and were profitable in 2025, with a 30% net margin. After building their own AI systems, they tripled monthly revenue with the same team size. Clients rate them 4.9 out of 5 in verified reviews, and the startups they build for have raised more than $25M in venture funding.

Your Role

You'll join the team building workflow software for one of the studio's clients: a live product that needs new workflow features while the existing ones keep running. The client's own engineers commit to the same repo, so every new table, permission and workflow goes in next to code someone else is changing. The weight is on the server side, from the SQL database on Azure up through the API, and you also build the React and TypeScript screens that sit at top.

AI coding tools draft most of the specs, tests and migrations. You direct them, read every diff line by line, and answer for what merges. If you'd rather write most of the code by hand, this probably isn't the right seat.

You report to the studio's leadership and work day to day with the lead developer and the product manager, who sets the acceptance criteria for each sprint. Success means delivering four to five features per two-week sprint, each verified before merge, and owning one area end to end (such as the task engine or the legacy migration) without breaking a live feature.

You Bring

• 4+ years building full-stack web applications and releasing them to production
• Experience working in a codebase you didn't write, learning its conventions before changing it
• Hands-on work on workflow software where different user roles see different data, with approvals, task queues or state machines and an audit log or versioned history
• React, TypeScript and SQL on Azure, including schema design and migrations
• Daily use of Cursor, Claude Code or a similar AI coding tool on production work, with tests and CI behind it
• Clear written and spoken English
• Experience delivering in fixed-scope sprints with branches, code review and feature flags

Bonus Points

• Work in a regulated setting such as finance, health or insurance
• A migration from a legacy system, with reconciliation and duplicate review
• Time as an outside vendor committing to a client's repo
• Project rules, custom prompts or agent setups for AI coding tools that your team adopted
• Spanish, since the platform is bilingual

What's Offered

• Fully remote contractor role from LATAM, full time at about 40 hours a week
• Core hours in US time zones, so your day overlaps with the lead developer and the product manager
• An area of the product to own end to end, with your schema designs reviewed by the lead developer and the client's engineers
• A team where AI-first delivery is already the daily routine, with tests, CI and feature flags as part of the normal process
• A start in early November

Interview Process

• Intro Call: 30 minutes with atomic HR on your background and goals
• Leadership Screening: A short call, possibly with an async part first
• Product and Developer Conversation: How you take features from acceptance criteria to merge
• Take-Home Test: One feature like the real scope, built and checked