Senior Software Engineer

Fluxon

Portugal, Remote (Lisbon - Portugal) Remote permanent

Posted: November 17, 2025

Required Skills

Job Description

Who we are

We are Fluxon, a product development team founded by ex-Googlers and startup founders. We offer full-cycle software development: from ideation and design to build and go-to-market. We partner with visionary companies, ranging from fast-growing startups to tech leaders like Google and Stripe, to turn bold ideas into products with the power to transform the world.

The role is open to candidates based in Portugal preferably in Lisbon.

About the role

As a Senior Software Engineer at Fluxon, you'll have the opportunity to bring products to market while learning, contributing, and growing with our team.

You'll be responsible for:

• Driving end-to-end implementations all the way to the user, collaborating with your team to build and iterate in a dynamic environment

• Engaging directly with clients to understand business goals, give demos, and debug production issues

• Informing product requirements, identifying appropriate technical designs in partnership with our Product and Design teams

• Proactively communicating progress and challenges in your work and seeking help when you need it

• Performing code reviews and cross-feature validations

• Providing mentorship in your areas of expertise

You'll work with a diversity of technologies, including:

• Languages

• TypeScript/JavaScript, Java, .Net, Python, Golang, Rust, Ruby on Rails, Kotlin, Swift

• Frameworks

• Next.js, React, Angular, Spring, Expo, FastAPI, Django, SwiftUI

• Cloud Service Providers

• Google Cloud Platform, Amazon Web Services, Microsoft Azure

• Cloud Services

• Compute Engine, AWS Amplify, Fargate, Cloud Run

• Apache Kafka, SQS, GCP CMS

• S3, GCS

• Technologies

• AI/ML, LLMs, Crypto, SPA, Mobile apps, Architecture redesign

• Google Gemini, OpenAI ChatGPT, Vertex AI, Anthropic Claude, Huggingface

• Databases

• Firestore(Firebase), PostgreSQL, MariaDB, BigQuery, Supabase

• Redis, Memcache

Qualifications

• 5+ years of industry experience in software development

• Experienced with the full product lifecycle, including CI/CD, testing, release management, deployment, monitoring and incident response

• Fluent in software design patterns, scalable system architectures, tooling, fundamentals of data structures and algorithms

What we offer

• Exposure to high-profile SV startups and enterprise companies

• Competitive salary

• Fully remote work with flexible hours

• Flexible paid time off

• Profit-sharing program

• Healthcare

• Parental leave, including adoption and fostering

• Gym membership and tuition reimbursement

• Hands-on career development

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