Senior Software Engineer (Backend)

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. ## Work with great people Joni Vatjus-Anttila Director, Customer Success Management _"Being able to say that our job is to keep our customers safe is everything to me. It creates a sense of purpose."_ Łukasz Kwieciński Senior Manager, R&D _"Working here has been a transformative experience — the sophisticated challenges drive rapid growth, while the friendly, supportive team makes even the toughest problems easier to tackle."_ ## Great Place to Work - Over 900 amazing colleagues in 18 offices - Possibility to protect the world - Work with best of class experts who care - Relaxed, open and fun working environment - 70+ nationalities - Global with the spirit of a small company ## About the company **Purpose – Why we exist** **We are here to build and sustain trust in a digital society** We are here to build and sustain trust in a digital society — trust that is threatened by uncertainty, fear and worry caused by cyber attacks and crime. **Vision – Where we are heading** **No one should experience a serious loss because of a cyber attack** We envision a future where no one should experience a serious loss or be put out of business because of cyber attack or crime. At least no one who puts their trust in us. **Mission – What we do** **Accelerate transition to outcome-based security** Our mission is to research, innovate and build technologies, human expertise and delivery-business models that will accelerate our customers’ and partners’ transition to outcome-based security. **Diversity & Inclusion:** WithSecure is an equal opportunity employer and believe that employing a diverse workforce is central to our success. We are committed to ensuring all qualified applicants will receive consideration for employment without regard to nationality, colour, race, ethnic or national origin, sex, gender (including gender reassignment), sexual orientation, religion or belief, age, marital status or physical or mental disability. We will do everything we can to support you during your application. If you need us to make any adjustments to our recruitment process, speak to our recruitment team who will be happy to support you! Lucas Weber \| Contact Person _Mail_ [Send e-mail](mailto:lucas.weber@withsecure.com) [I'm interested](https://emp.jobylon.com/applications/jobs/368449/create/) [© MapTiler](https://www.maptiler.com/copyright/) [© OpenStreetMap contributors](https://www.openstreetmap.org/copyright) [+](https://emp.jobylon.com/jobs/368449-withsecure-senior-software-engineer-backend/# "Zoom in") [−](https://emp.jobylon.com/jobs/368449-withsecure-senior-software-engineer-backend/# "Zoom out") [© MapTiler](https://www.maptiler.com/copyright/) [© OpenStreetMap contributors](https://www.openstreetmap.org/copyright) ###### WithSecure Helsinki \| Hybrid [Visit website](https://www.withsecure.com/en/about-us/careers/open-positions/)