Senior Software Engineer, Account

LesJeudis; Paris; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Swile meal vouchers

Alan health insurance

Transportation reimbursement 50%

Gymlib for sports and exercise

Syntec holiday bonus and RTT

Job summary

Lemonway, a licensed payment institution, is hiring a Senior Software Engineer for the Account Tribe in Paris. You will design and implement compliant, scalable backend services, lead architecture reviews, and drive collaboration across squads focused on compliance and platform reliability.

With 5+ years of experience, you will work in a hybrid setup, bridging technical and business value, and mentoring peers to uphold engineering excellence in a fast-growing fintech environment.

Qualifications

• 5+ years of software engineering experience with backend focus.
• Deep knowledge of DDD, Hexagonal architecture, CQRS, and event-driven architectures.
• Strong experience with NestJS, TypeScript, MongoDB, RabbitMQ, and AWS.

Responsibilities

• Design and deliver scalable, complex backend features for payments compliance systems.
• Lead code and architecture reviews, enforcing Tribe practices and architectural decisions.
• Mentor peers to raise engineering standards and share best practices.
• Own products from specification to production, addressing client issues in production.
• Collaborate with software, QA and infra engineers and product managers.
• Translate complex architectural decisions into clear insights for technical and non-technical stakeholders.
• Participate in hybrid work setup with office, home, and nearshore teams.
• Balance independent problem-solving with guiding teammates and solution orientation.

Skills

5+ years experience

DDD

Hexagonal architecture

CQRS

Event-Driven

Microservices

NestJS

TypeScript

MongoDB

RabbitMQ

AWS

Terraform

CI/CD

OOP

French fluency

English proficiency

AI tools

Tools

Terraform

Job description

Lemonway is a licensed payment institution at the heart of Europe's new digital economy.

We secure payments for crowdfunding platforms, the collaborative economy, marketplaces and online retailers, with a strong commitment to fighting fraud and protecting funds.

Regulated by the ACPR and benefiting from the European passport in 29 countries, Lemonway is based in Paris and Hamburg and brings together 150 multicultural and committed Lemonheroes.

More than 400 marketplaces trust us. We manage 1.4 million user wallets and have raised €50 million from Breega, Speedinvest and Toscafund.

Profitable for the past four years and growing by 25% in 2025, Lemonway aims to remain one of Europe's leading payment providers through healthy and sustainable growth.

About the Team

We are looking for a Senior Software Engineer for the Account Tribe, who build a critical part of our platform powering the compliance experience across channels. You will be led by John, the Engineering Manager of the Tribe, and work closely with 6 engineers across 2 squads : Comply, and Manage.

Through this role, you will drive the enhancement of our platform by specifying, implementing, testing, monitoring, and troubleshooting customer-facing services. You will also lead API integrations with third-party compliance vendors and implement regulatory compliance rules to meet regulatory requirements.

This role combines technical craftsmanship, teamwork and product mindset for a Tribe that is central to both current and future projects for Lemonway. Join us to architect a resilient, unified platform built to seamlessly adapt to tomorrow's regulatory landscape.

Your Responsibilities

• Design and deliver scalable, complex features that can evolve with the right trade-off between code quality and time spent
• Lead code and architecture reviews, actively enforcing and shaping the Tribe's best practices and architectural decisions
• Drive continuous improvement: stay updated on the latest ecosystem trends, experiment with new patterns, and actively mentors peers to elevate the Tribe's engineering standards
• Take strong ownership of the products we develop, and contribute to all parts of the development cycle from specifying to solving issues that our clients are facing in production
• Deep dive into our complex payment ecosystem. Ask tough questions, challenge the status quo, and leverage your architectural expertise together with domain knowledge to build resilient solutions
• Understand the "why" behind the "what": bridge the gap between technical implementation and business value, ensuring our payment flows directly drive Lemonway's operational success and client satisfaction
• Collaborate closely with software, QA and infrastructure engineers to solve technical challenges, as well as product managers for feature development
• Act as a technical communicator: translate complex architectural decisions into clear, actionable insights for both technical and non-technical stakeholders
• Participate actively in our hybrid setup with people at the office, at home, and nearshore
• Strike the right balance between independent problem-solving and guiding teammates, whilst being solutions oriented in your approach
• You have 5+ years of experience in software engineering, building robust and scalable applications
• You have deep architectural knowledge and proven hands-on experience with Domain-Driven Design (DDD), Hexagonal architecture, Event-Driven Architecture, and Command Query Responsibility Segregation (CQRS)
• You have a solid grasp of Object-Oriented Programming (OOP) principles, and a proven track record of designing, building and operating micro services-based architectures
• You possess excellent communication skills, enabling you to drive technical consensus and collaborate effectively across teams
• You actively leverage AI tools in your ways of working
• You are familiar with our modular technical stack based on NestJS (TypeScript), MongoDB, and RabbitMQ running on AWS
• You have practical experience in building CI/CD pipelines and using Terraform for Infrastructure as Code (IaC)
• You are fluent in French and you are comfortable working in English, which is a strong asset given our international environment
• (Nice to have) Knowledge of KYC and compliance topics in a regulated environnent

Compensation and benefits

• A competitive salary package
• Flexibility to work from home 2 days per week and 3 full weeks per year.
• Swile meal vouchers
• Alan as complementary health insurance
• Transportation reimbursement 50%
• Gymlib for sports and excercise
• Syntec holiday bonus and 10 additional rest days per year (RTT)