Job Title: Senior Java Engineer
Location: Denver, CO (Hybrid)
About FusionAuth
FusionAuth is a fast-growing startup and leading provider of customer identity and access management (CIAM) software headquartered in Denver, Colorado. Our mission is to make authentication and authorization simple and secure for every developer. Our product helps businesses securely manage customer identities and access, ensuring a seamless and safe user experience for some of the largest brands in the world. We are committed to delivering exceptional value and satisfaction to our clients through top-notch service and support. With a great team and strong investors, we are expanding our team to help accelerate our growth and take FusionAuth to the next level.
Job Summary
We are recruiting a Senior Java Software Engineer who will join our engineering team to help us achieve these goals. This exciting role will allow you to build new features, extend existing features, learn from customers to improve the product and participate in our growing developer community. For this role, you must be a creative and quantitative thinker. You should be interested in the authentication, authorization and user management space. You should be seasoned at writing secure and high-performance code. The ideal candidate will be a self-starter, fast worker and excited about growing a company from the ground up. This position reports to the Engineering Manager.
Responsibilities
- Writing high-quality, performant, and secure code
- Connect unfamiliar technical concepts to your existing knowledge base and find pragmatic paths forward
- Balance immediate deliverables with long-term architectural thinking and planning
- Writing extensive and thorough tests
- Designing and producing new features
- Maintaining our software with bug fixes and enhancements
- Writing clear, high-quality documentation for new features
- Rotate as the on-call engineer to solve critical customer issues. While not the norm, we do have some off-hours support requirements.
- Provide technical support to our customers
- Be a voice of positive change in the Engineering organization
Qualifications
Required
- 10+ years of professional software development experience
- Bachelor’s degree in computer science, or demonstrable experience with a broad set of theoretical topics
- Highly proficient in object-oriented design and implementation
- Understanding of the full web stack (HTTP, TCP/IP, REST, etc)
- Experience with building highly available, high-performance, scalable applications
- Expertise in building multi-threaded, API-first applications
- In-depth knowledge of unit and integration testing
- Real working knowledge of relational databases—you understand query optimization, indexing strategies, and database design beyond ORM abstractions
- Experience up and down the entire stack, including cloud infrastructure, operating systems, databases, back-end services, and JavaScript on the front end
- Comfortable working in a hybrid model (in-office attendance expected 2 days/week for first 3-6 weeks, then hybrid/remote as needed)
Preferred
- Strong quantitative and data-driven approach to solving problems
- Quick learner with the ability to master new technologies and skills rapidly
- Interest or experience in the authentication space
- Influential communicator: holds strong opinions but adapts flexibly to new information or team input
- Appreciates first principles thinking, but understands when it’s time to stop theorizing and start building
- Comfortable and passionate about working in open-source environments
- Adaptable to challenges common in a startup with ~50 employees
- Enjoys and thrives in a dynamic startup vibe.
Compensation
- $140 - 180k expected base salary range*
When you join FusionAuth’s Denver team, you’ll enjoy a modern campus experience designed for productivity, wellness, and community:
- Newly upgraded amenity spaces including a sleek tenant lounge and café with booth seating and collaborative workspaces.
- Access to a fitness studio, showers, lockers, and secure bike storage.
- Regularly stocked in-suite kitchen with a variety of snacks and beverages to keep you fueled throughout the day.
- Onsite café offering chef-driven menus with fresh, locally sourced, organic, and non-GMO options to suit diverse dietary needs. Easy ordering via app.
- 3-acres of green space, including communal parks and picnic areas, connected to miles of jogging, biking, and recreation trails.
- Yoga in the circle and wellness programs to enhance work-life balance.
- Dedicated outdoor workspaces and patio gathering areas.
- Ample on-site parking, easy freeway access, and high-speed fiber internet.
- Sustainability-minded campus and community initiatives, including support for regenerative agriculture programs.
Enjoy a high-tech business environment that inspires creativity and energizes your workday—all just minutes from the heart of Denver and Boulder.
Top Skills
What the Team is Saying
What We Do
FusionAuth builds software for developers needing to add authentication to their software products. It's a big problem - every application needs authentication, but building it yourself is a complex distraction. We distribute our free Community software through word-of-mouth reputation to software developers worldwide. We nurture and support the software development communities, taking their input to give "Devs" the features they need for secure and convenient Customer Identity and Access Management. And we've built a fast growing business by offering paid plans and hosting with higher end features and support.
It's Product Led Growth at its best. Start with the free version, then when your business depends on customers logging into your application, upgrade to our full featured plans. Over 3,000 companies already have..
Why Work With Us
FusionAuth is a founder-led company. We are profitable but recently raised an investment round to accelerate our growth (more on that here: https://fusionauth.io/blog/fusionauth-funding). We have a culture of software developers ("Devs") building great software for use by other Devs, the way they want to see it.
Gallery
FusionAuth Offices
Hybrid Workspace
Employees engage in a combination of remote and on-site work.
Our Westminster, CO office is a hybrid, a place for in-person collaboration. Local employees are in 1-3 times/week. Remote employees every few months. Daily workplace location is at the employee's discretion - wherever they can be most productive.
