Senior Interaction Designer (in person)
Westfield, Indiana
UX /
Full-time /
On-site
Our teams build products that keep planes flying, help first responders save lives, and allow farmers to feed the world. Our clients range from Fortune 100 enterprises to fast-moving startups. Founded in 1988, SEP is one of Indiana’s largest software product development and design companies.
Why SEP for Your Design Career
At SEP, you won’t just design screens—you’ll define how systems behave. As a Senior Interaction Designer, you’ll embed with client teams to tackle complex, meaningful problems. From internal tooling to consumer-facing apps, you’ll shape behavior, logic, and flows that connect real-world needs with digital systems.
We’re not an agency—we’re a consultancy. We co-create with our clients, guiding not just what we build, but how we build it. Designers at SEP influence product direction, align cross-functional teams, and raise the bar for design maturity across industries.
Design maturity here grows through practice. You’ll solve real problems, reflect with peers, and share what works. Senior designers lead by example—coaching others through collaboration, critique, and modeling clear decision-making.
We value assertiveness and empathy in equal measure. You’ll need to read the room, push when it matters, and navigate ambiguity with care. It’s about asking better questions, asserting ideas thoughtfully, and knowing when to agree to disagree.
You Might Be Our Next Senior Interaction Designer If You:
- Thrive on the complexity of software systems—and have the experience to back it up
- Align user needs, technical constraints, and business goals to create real impact
- Bring energy and clarity to design conversations and client engagements
- Collaborate closely with engineers, PMs, and stakeholders—and help the whole team work smarter
- Are available to work on-site full-time at our Carmel, IN headquarters
Responsibilities and Duties
- Define how products behave through flows, rules, logic, and interaction patterns
- Translate ambiguity into viable product direction using design research and framing
- Shape design flow: structure artifacts, decisions, and sequencing to guide teams through discovery and delivery
- Shape alignment flow: build visual models and shared understanding across stakeholders
- Work end-to-end across the product lifecycle—from discovery through delivery
- Plan and synthesize generative and evaluative research to validate behavioral assumptions early
- Create maps, flows, IA, rules charts, and prototypes that guide confident implementation
- Collaborate with developers to ensure designs are feasible, testable, and coherent
- Reduce rework and misalignment by designing early clarity into every step
- Help SEP, clients, and teammates improve through shared learning and continuous feedback
- Contribute to our design practice through writing, facilitation, and mentoring
- Occasionally travel within Indiana or nearby states for in-person client work
Required Qualifications
- 8+ years of professional experience in product or interaction design, with a track record of leading complex, cross-system projects and guiding teams through ambiguity
- Consultancy or agency experience
- Degree in UX, Visual Communication Design, or related field; HCI coursework or certification preferred (Master’s degree in HCI or related discipline strongly preferred)A strong portfolio demonstrating a variety of problem types and platforms
- Clear articulation of your role and contributions within project teams
- Strong communication, framing, and consulting skills
- Experience collaborating with engineers and PMs in Agile or Lean environments
- Effective visual design and interface work using Figma
- Experience breaking down large problems into incremental, testable design work
- Experience coaching designers and influencing team decision-making
- Must be legally authorized to work in the U.S.
- Must not require visa sponsorship or OPT/CPT authorization
- Must be able to work full-time, in-person, at SEP headquarters in Carmel, IN
Bonus Points
- Experience designing for AI systems, automation, or complex logic
- Experience using AI in your own design workflow
- Comfort assessing client design maturity and coaching teams toward growth
SEP is a software product design and development company located in Westfield, IN. We provide powerful teams of thoughtful developers and designers to bring ideas to life. Founded in 1988, SEP is one of Indiana’s largest software development firms with 170 employees. Our clients span from Fortune 100 to scale-up companies. We are 100% employee-owned through an ESOP and are consistently recognized for our great culture (Top Workplaces, Best Place to Work in Indiana, Techpoint Mira Exceptional Employer).
We are an equal opportunity employer. All employment is decided based on qualifications, performance, merit, and business need. We do not discriminate on the basis of race, color, religion, marital status, age, national origin, ancestry, physical or mental disability, medical condition, pregnancy, genetic information, gender, sexual orientation, gender identity or expression, veteran status, or any other status protected under federal, state, or local law.
