Quantitative Developer Intern

Why work for us?

A career at Janus Henderson is more than a job, it’s about investing in a brighter future together. 

Our Mission at Janus Henderson is to help clients define and achieve superior financial outcomes through differentiated insights, disciplined investments, and world-class service. We will do this by protecting and growing our core business, amplifying our strengths and diversifying where we have the right.

Our Values are key to driving our success, and are at the heart of everything we do:

Clients Come First - Always | Execution Supersedes Intention | Together We Win | Diversity Improves Results | Truth Builds Trust

If our mission, values, and purpose align with your own, we would love to hear from you!

Your opportunity 

This is a 10-week summer internship program from June 1st to August 7th, 2026, (dates are flexible), focusing on first-hand experience in the team and discovering what your future would be like with us through induction, on the job learning, skills training and networking.

As a Quantitative Developer Intern, you will support a Quantitative Developer in developing a cutting-edge LLM agent for structured products.

• Assist in the development of an LLM-powered credit analyst agent that automates securitized bond diligence – pulls data, models cash flows, runs comps, and returns a sourced, PM-ready brief in minutes
• Help implement evaluation, grounding, and guardrails (quality metrics, tracing, safety) to deliver accurate, auditable outputs for analysts via a chat interface
• Work on a batch-scoring API to apply the analysis across broad bond universes and persist scores for systematic signals and back testing
• Carry out additional duties as assigned

What to expect when you join our firm

• Hybrid working and reasonable accommodations
• Generous Holiday policies
• Paid volunteer time to step away from your desk and into the community
• Support to grow through professional development courses, tuition/qualification reimbursement and more
• Maternal/paternal leave benefits and family services
• Complimentary subscription to Headspace – the mindfulness app
• Corporate membership to ClassPass and other health and well-being benefits
• Unique employee events and programs including a 14er challenge
• Complimentary beverages, snacks and all employee Happy Hours

Must have skills

• Enrolled in a four-year university program
• Pursuing a bachelor's degree in computer science (or another related field)
• Expected graduation date in 2027 or 2028
• Fluent in Python, applying best practices and modern workflows
• Proficient in any standard SQL dialect
• Hands-on experience with large language models, including building prompts, applying retrieval or tool-use patterns, or integrating LLMs into applications
• Exceptional analytical and interpersonal skills
• Passionate about financial markets with a curiosity about investing

Nice to have skills

• Experience with LLM frameworks or agent architectures
• Familiarity with model evaluation and grounding techniques
• Exposure to cloud platforms and modern DevOps tools
• Knowledge of data engineering patterns and API design
• Experience with numerical Python or ML libraries
• Background or coursework in data science/math/stats
• Background or coursework in fixed income or credit markets

Supervisory responsibilities

• No

Potential for growth

• Mentoring
• Leadership development programs
• Regular training
• Career development services
• Continuing education courses

Compensation information

The hourly rate for this position is $34.00. This range is estimated for this role. Actual pay may be different. This role will remain open through February 28th, 2026.

All applications must include a resume and cover letter. With your cover letter, please include answers to the following questions in 3-5 sentences each:

• What interests you about software development within finance?
• What about data science do you find interesting?
• What skills do you have or want to have in your technical toolkit?

At Janus Henderson Investors we’re committed to an inclusive and supportive environment. We believe diversity improves results and we welcome applications from candidates from all backgrounds. Don’t worry if you don’t think you tick every box, we still want to hear from you! We understand everyone has different commitments and while we can’t accommodate every flexible work request, we’re happy to be asked about work flexibility and our hybrid working environment. If you need any reasonable accommodations during our recruitment process, please get in touch and let us know at earlycareers@janushenderson.com.

#LI-LN1  

Janus Henderson Investors is an equal opportunity employer. All qualified applicants will receive consideration for employment without regard to race, color, religion, sex, sexual orientation, gender identity, national origin, disability or veteran status. All applications are subject to background checks.

Janus Henderson (including its subsidiaries) will not maintain existing or sponsor new industry registrations or licenses where not supported by an employee’s job functions (as determined by Janus Henderson at its sole discretion).

You should be willing to adhere to the provisions of our Investment Advisory Code of Ethics related to personal securities activities and other disclosure and certification requirements, including past political contributions and political activities. Applicants’ past political contributions or activity may impact applicants’ eligibility for this position.

You will be expected to understand the regulatory obligations of the firm, and abide by the regulated entity requirements and JHI policies applicable for your role.