Senior Software Engineer (Backend)

Cloud Protection by WithSecure; Helsinki; Hybrid; EUR 90,000 - 130,000; Full time

Benefits offered by this job

Meaningful impact

Hybrid work

30 days abroad

Paid sick leave

Mental health support

Continuous learning

Job summary

Cloud Protection by WithSecure in Helsinki is seeking a Senior Software Engineer for the Backend Team within CPSF to scale real-time threat protection inside Salesforce workflows. You will design and implement backend services on .NET and AWS, focusing on reliability, security, and scalability, with collaboration across product, architecture, and DevOps.

The role is hybrid with regular time in the Helsinki office; English fluency is expected, and cybersecurity knowledge is a plus.

Qualifications

• 5+ years of experience as a software engineer with a backend focus.
• Experience designing, deploying, and operating production workloads on AWS.
• Experience with Lambda, ECS, API Gateway, S3, RDS or similar services.
• Strong collaboration across Product, Architecture, and Front-end teams.
• Fluent English and base in Finland (Uusimaa) with hybrid Helsinki work.

Responsibilities

• Develop and maintain backend services using .NET and AWS.
• Build backend microservices and APIs for internal services and Salesforce integrations.
• Support file streaming and callback-based workflows.
• Participate in full feature lifecycle from design to testing and maintenance.
• Collaborate with developers, architects, QA, DevOps, Salesforce teams, and stakeholders.
• Create and review pull requests, maintain code quality, and drive best practices.
• Build and maintain AWS infrastructure including networking, security, storage, compute, monitoring.
• Contribute to investigations through spikes, ADRs, and PoC work; monitor observability.

Skills

Backend development

AWS

APIs

Fluent English

Hybrid Finland

Tools

AWS Lambda

API Gateway

S3

RDS

Job description

Cloud Protection protects Fortune 500 enterprises and government organizations worldwide from malware, phishing, and identity-based attacks in Salesforce. Our work builds on more than 30 years of experience in analyzing malware and defending against advanced threats — expertise few security companies can match.

It's our people who make that possible. Newly independent after years as WithSecure's most autonomous business unit, we combine the focus and speed of a startup with decades of cybersecurity depth. We're a diverse team that values passion, purpose, and genuine wellbeing at work, and we're looking for people who want to set the standard for Salesforce security with us. If that sounds like you, we'd love to hear from you.

We're looking for a Senior Software Engineer to work in our Backend Team within Cloud Protection for Salesforce (CPSF) — a fast-growing cybersecurity SaaS product within WithSecure™. CPSF is a real-time threat protection solution that scans files, URLs, and QR codes across Salesforce workflows — including Sales Cloud, Service Cloud, Experience Cloud, and Agentforce. It's already trusted by Fortune 500 companies globally, and we're scaling fast. The backend powers the core intelligence of the product: threat detection engines, API integrations, and our security cloud infrastructure running on AWS.In this role, you'll work in the backend engineering team - responsible for the scalability, reliability, and security of our cloud infrastructure and services.

Key Responsibilities

• Develop and maintain backend services using .NET and AWS.
• Work on backend microservices and APIs consumed by Salesforce applications and other internal services.
• Support workflows that include file streaming and callback-based responses.
• Participate in the full feature lifecycle: requirements discussion, design, task breakdown, implementation, testing, and maintenance.
• Collaborate with other developers, architects, QA, DevOps, Salesforce teams, and product stakeholders.
• Create and review pull requests, contribute to technical discussions, and maintain code quality.
• Build and maintain AWS infrastructure including networking, security, storage, compute, messaging, databases, monitoring, and scaling services.
• Contribute to technical investigations through spikes, ADRs, and proof-of-concept work.Monitor observability, investigate issues, and support production m??????

What are we looking for?

• 5+ years of experience as a software engineer, with a strong background in backend systems and cloud infrastructure.
• AWS experience — you're comfortable designing, deploying, and operating production workloads on AWS.
• Experience with services such as Lambda, ECS, API Gateway, S3, RDS, or similar is a strong advantage.
• Strong collaboration skills — you work naturally across Product, Architecture, and Front-end teams to move things forward.
• Proficiency with AI tooling and a genuine interest in leveraging it to increase team efficiency.
• Based in Finland (Uusimaa area) — this is a hybrid role with regular time in our Helsinki office.
• Background in cybersecurity is a plus but not required — curiosity and willingness to learn the domain matters most.
• Fluent English

If you don’t tick every box above, don’t worry — we’re more interested in your potential and willingness to learn.

The salary displayed on this page represents the starting point for the role. Final compensation is discussed individually and depends on experience, skills, and the local market.

What will you get from us

• Meaningful work with real-world impact – your work helps protect businesses and critical infrastructure from modern cyber threats.
• Flexible ways of working, including up to 30 days per year working abroad and paid sick leave from day one.
• A strong focus on well-being, with mental health support and comprehensive benefits.
• Continuous learning, modern tools, and a people-first culture that values trust and collaboration.