About this role.
LastPass is hiring a Senior Backend Engineer to modernize and operate the .NET-based commerce, billing, and payment services supporting its subscription platform. The role centers on building scalable REST APIs, microservices, payment-gateway integrations, and reliable customer-facing capabilities. The engineer will collaborate with Product, Finance, Data, Operations, QA, SDETs, and other engineers while contributing to architectural decisions and non-functional requirements. Strong C#, .NET Core, relational database, Entity Framework Core, Docker, security, and distributed-systems experience are central to success. This remote role is specifically located in Portugal and also includes mentoring responsibilities.
Role DNA
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Job Complexity
4/5Pace & Pressure
4/5Autonomy Level
4/5Communication Load
4/5Salary analysis
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Core skills
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Sample interview questions
I would define a provider abstraction to isolate gateway-specific logic, use idempotency keys to prevent duplicate charges, and persist payment state transitions transactionally. I would add structured logging, retry policies with backoff for transient failures, webhook validation, reconciliation processes, and clear monitoring for failed or delayed payment events.
I favor additive changes, stable resource contracts, explicit versioning when breaking changes are unavoidable, and deprecation windows with documented migration paths. Contract tests, consumer feedback, and telemetry on endpoint usage help ensure changes are safe before older behavior is retired.
I would first map dependencies, performance constraints, failure modes, and critical business workflows. Then I would prioritize incremental changes such as improving test coverage, extracting bounded components, updating observability, and deploying behind feature flags, while measuring reliability and latency throughout the migration.
I apply least-privilege access, secure secret storage such as AWS Secrets Manager, encryption in transit and at rest, input validation, strong authentication and authorization, and audit logging. I also minimize sensitive data retention, validate payment-provider webhooks, and include security reviews and dependency scanning in the delivery process.
I would begin by helping them frame the problem with evidence from logs, metrics, and reproducible cases rather than immediately prescribing a solution. We would work through trade-offs together, agree on a small safe experiment, and afterward document the learning so the engineer gains confidence and the team benefits from the outcome.
About LastPass
LastPass delivers Secure Access Essentials, helping individuals and organizations manage and protect access to AI, applications, and credentials straight from the browser. Trusted by more than 100,000 businesses and millions of users worldwide, LastPass blends strong security with everyday simplicity. From discovering unapproved AI and applications to reducing login friction and securing credentials across the business, LastPass delivers on its mission to give everyone seamless access to everything they need to work, move fast, and stay protected as their environments evolve.
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LastPass is looking for Senior Backend Engineer (.NET):
In this role, you will evolve the commerce and payment platforms powering LastPass subscriptions. At this career level, you will modernize services and deliver reliable payment integrations — helping LastPass deliver on its mission to give everyone seamless access to everything they need to work, move fast, and stay protected.
About the team:
The Commerce engineering team sits at the heart of LastPass’s global commerce infrastructure. The team architects, scales, and maintains the backend platforms that drive e-commerce, billing, and payment processing. Working primarily in .NET, the team owns the critical systems that keep LastPass subscriptions running reliably for customers worldwide.
If you are passionate about complex problem solving and motivated by scale, then this is the role for you!
Who will you work with?
You will work closely with fellow .NET engineers, SDETs, QA engineers, database developers, and engineering leaders to design, build, test, and support reliable commerce and payment services. You will also partner with teams across Product, Finance, Data, and Operations to deliver secure and seamless payment experiences for LastPass customers globally.
What are some of the exciting challenges you will be working on?
- Design and implement scalable .NET services and REST APIs that power commerce and payment capabilities for LastPass customers worldwide
- Deliver payment gateway integrations and regional payment method support, expanding reach and reliability for LastPass subscribers
- Contribute to planning, design, and feature delivery in close collaboration with a cross-functional engineering team
- Advocate for non-functional requirements and cost-effective solutions, developing, testing, and maintaining services within your domain
- Collaborate across teams, engage in technical decision-making, and help influence the platform’s architectural direction
- Coach and mentor engineers at various levels, raising the bar for engineering quality and team capability
- Contribute to a customer-facing application, shaping it with new features that meet evolving user needs and business objectives
What does it take to work at LastPass?
- Proven experience in C# and .NET Core for web application development
- Proven experience in REST API design, creation, and consumption
- Proven experience with relational databases and Entity Framework Core
- Solid grounding in OOP best practices, containerisation with Docker, and web security principles
- Proven experience designing and operating microservice architectures
- Recognised internally as a clear and confident communicator, able to engage technical and non-technical stakeholders with equal ease
- Approaches complex challenges with a team-first mindset, bringing creative problem-solving and consistent follow-through
It’s great, but not required:
Ability to create architecture, explain it, and create ADR/RFC documentation
Experience with commerce systems and various payment providers
Knowledge of Zuora development
Experience with AWS, including Secrets Manager (or another cloud provider), and background services
Foundational knowledge of Angular
Why LastPass?
- The leader in secure access
- High-growth, collaborative environment with inclusive teams
- Remote-first culture
- Competitive compensation
- Flexible Paid Time Off policies, including but not limited to: Quarterly Self-Care Days (4 extra paid days off annually) and Volunteer Days
- Parental leave
- Comprehensive health coverage, including dependents
- Home office setup support
- LastPass Families free account for up to 5 members
- Continuous learning and development opportunities, including an annual learning stipend to invest in your growth
- Peer-to-peer recognition through Motivosity
- Employee Assistance Program for well-being support
- Remote work stipend to support your home office needs
- Short-Term or Remote-Centric Work Arrangements for added flexibility
Unlock your potential with us – your skills, experience, and unique perspective matter more than just checking the boxes. Apply today, and let’s build the future together!
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