Senior Software Engineer, Payments

Lemonway; Paris; Hybrid; EUR 90,000 - 120,000; Full time

Benefits offered by this job

Meal vouchers Swile

Hybrid 2 days WFH per week

Alan health care plan

NaviGo/Vélib transport reimbursement

Job summary

Lemonway is seeking a Senior Software Engineer for the Payments Tribe in Paris. You will architect, implement, test and monitor services across payment APIs, processing, reconciliation and core banking systems.

You will collaborate with 8 engineers across 2 squads, focusing on a next-generation card payment stack for acquiring and issuing and a cash management platform. The role requires strong architecture skills and cross-team communication within a hybrid setup.

Qualifications

• 5+ years of experience in software engineering
• Hands-on experience with modern software architectures (DDD, Hexagonal, EDA, CQRS)
• Strong relational database and microservices expertise
• Excellent communication and cross-team collaboration
• Familiarity with CI/CD pipelines and IaC practices

Responsibilities

• Architect, design and drive enhancement of the payment platform across APIs, processing and core banking systems
• Lead code and architecture reviews and shape engineering standards
• Collaborate with product managers and engineers to deliver scalable features
• Mentor peers and promote best practices in a hybrid team environment

Skills

Domain-Driven Design

Hexagonal architecture

Event-Driven Architecture

CQRS

Relational databases

Microservices

Communication skills

Tools

.NET (C#)

MS SQL

RabbitMQ

Docker

Kubernetes

Terraform

Job description

the company 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, the company 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, the company aims to remain one of Europe’s leading payment providers through healthy and sustainable growth.

About the role

We are looking for a Senior Software Engineer for the Payments Tribe, a critical part of our platform powering the payment experience across all channels. You will report to the Engineering Manager of the Tribe, and work closely with 8 engineers across 2 squads (Core banking, Payments).

You will architect, design, and drive the enhancement of our platform by specifying, implementing, testing, monitoring and troubleshooting the services provided to our customers, working across payment APIs, processing, reconciliation, and core banking systems.

This role combines technical craftsmanship, teamwork and product mindset for a Tribe that is central to both current and future projects for the company. You will play a pivotal role in designing and delivering our next-generation card payment stack for acquiring and issuing, as well as our cash management platform.

Your responsibilities

Technical craftsmanship 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

Domain ownership

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 the company’s operational success and client satisfaction

Team player

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

Your qualifications

• 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 strong expertise in relational databases 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 are familiar with our technical stack based on modern .NET (C#), MS SQL, RabbitMQ, Docker, and Kubernetes

• 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) You actively leverage AI tools in your ways of working

• (Nice to have) Knowledge of payments processing in a regulated environment

What we offer

Offices in Sentier, at the heart of Paris

• A hybrid way of working with 2 days of WFH/week

• Meal vouchers through Swile

• Alan complementary health care plan

• 50% Reimbursement of your monthly transportation pass Navigo/Vélib

• Access to Gymlib for a healthier lifestyle that works for you

• Holiday and RTT plan aligned with the Syntec agreement

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