Lead Backend Developer at JMS

Joom; Lisboa; Hybrid; EUR 65,000 - 100,000; Full time

Benefits offered by this job

Health insurance

Meal allowance

Paid sick leave

Relocation support

AI tools access

Language courses (English/Portuguese)

Team building activities

Job summary

Joom is seeking a Lead Backend Developer in Lisbon to drive the architecture and delivery of scalable backend systems for our marketplace solutions. You will lead a team of 3–6 engineers, shape technical direction, and collaborate across cross-functional teams in a fast-paced environment.

Strong coding skills across languages (Go/Java/C++/Python) and solid algorithmic training are essential, as well as experience with Linux/Unix and distributed systems.

Qualifications

• Experience leading and mentoring backend teams (3–6 developers)
• Strong algorithmic training and complex project development experience
• Proficiency in Linux/Unix development
• Solid architecture and design skills for scalable backend systems
• Proven ability to recruit, hire, and train backend engineers
• Experience with high-load services and distributed systems

Responsibilities

• Come up with architecture for backend systems
• Program in Go; strong coding skills across languages is valued
• Provide fault tolerance for services in an AWS environment
• Prepare for increasing data loads and volumes
• Participate in new feature and product development discussions
• Manage and mentor a backend team of 3–6 developers

Skills

Leadership

Go/Java/C++

Algorithms

Backend design

Tools

MongoDB

Kubernetes

AWS

Job description

Joom Group is an international tech-centric group of e-commerce companies founded in 2016 in Latvia. We are here to transform the largest industry in the world, global trade, making it more transparent, efficient, and technology-driven.

Today, Joom Group brings together the following businesses: Joom, a global cross-border marketplace; JoomPro, the first and only end-to-end cross-border B2B marketplace; JoomPulse, an AI analytics tool for Mercado Livre sellers; and Onfy, a pharmaceutical marketplace in Germany. Joom Group's offices are located in China, Brazil, Portugal, Latvia, and Germany, with headquarters in Lisbon, Portugal. We work as one international team, sharing knowledge and collaborating across countries, businesses, and products.

We are currently looking for Lead Backend Developers to join the Joom Marketplace Solutions.

Joom Marketplace Solutions is a platform that allows Joom to go beyond its own marketplace and offer its solutions to other players in the market. Through technical integration, we give our partners access to millions of products from our sellers and take care of the entire order fulfillment process end to end.

Tech stack

Go, MongoDB, Kubernetes, Elasticsearch, AWS, Redis, Jenkins. Frontend: Node.js, React, TypeScript, Rush

Responsibilities

• Come up with architecture
• Program in Go (Go is not a must for us; it is more important for a successful candidate to have solid algorithm skills, fundamental technical knowledge, and great coding skills in general)
• Provide fault tolerance for coded services in an AWS environment
• Be prepared for a constant increase of processed and stored data loads and volumes
• Participate in new feature and product development discussions
• Managing and mentoring a backend team of 3-6 developers

• Experience in leading and developing a backend team by recruiting, hiring, and training new team members
• Confident knowledge of any of the programming languages: Go/Java/Kotlin/C++/Python/Scala
• Complex project development experience
• Excellent algorithmic training
• Experience in development for Linux / Unix

Preferred

• Experience with highload
• Experience with MongoDB
• Experience with Kubernetes

• Compensation package: base salary and performance-based bonuses
• Office-first: flexible hours with a possibility to work remotely 52 days per year
• Care & Wellbeing: health insurance (including dental care) for employees and their children, daily meal allowance, and 100% paid sick leave
• Relocation Support: full assistance for a smooth relocation for the employees and their family
• AI-first approach: licenses and access to a wide range of AI tools
• Team & Growth: collaboration with colleagues across Portugal, Brazil, Latvia and China, with opportunities for promotions, professional trainings, and English & Portuguese courses
• Community & Engagement: annual team building activities, knowledge-sharing workshops, and a strong sense of team work

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