MIO Partners, Inc. (MIO) provides proprietary investment products to McKinsey’s retirement plan and partners and offers independent, high-quality financial advice to McKinsey’s partners. We manage a wide array of investment vehicles with significant expertise and a long and successful track record in alternative strategies, including hedge funds and private equity. We have a multibillion-dollar portfolio of assets under management, and we manage assets for and advise only McKinsey-related clients; we do not accept outside or third-party investments.
MIO is a values-based organization that is strongly aligned with our investors’ interests. MIO measures success as performance relative to a market-based benchmark.
MIO, a 250+ person registered investment adviser, provides ample opportunities for somebody with an entrepreneurial drive to shine. We strive to meet the highest professional standards and build an organization that attracts, develops, and retains exceptional people. MIO is a wholly owned subsidiary of McKinsey, but our activities are kept entirely separate from those of the consulting Firm.
Position
JavaScript Application Developer will work directly on projects that improve the experience, efficiency, and performance of MIO’s core technology applications. The successful candidate will be comfortable working directly with developers, quants, database admins, DevOps, and business project managers to deliver front-to-back solutions.
This individual will be part of a small team of in-house and outsource developers, making hands-on contributions to the project portfolio with emphasis on productivity and code quality, and migrating our application stacks from an on-premises infrastructure to Cloud.
Additionally, the new hire is expected to work collaboratively with others in IT to realize the full life cycle of system development projects: from requirements gathering through white-boarding, application design, system design, data modeling, coding, delivery, support, and enhancements through an agile/scrum process. It is expected that the new hire will work in our Midtown, New York offices 4 days a week (Monday-Thursday).
Primary responsibilities
- Collaborate to shape the future of our application architecture
- Raise the bar on our development capabilities and processes
- Work to synthesize requirements gathered from multiple teams inside and outside IT and suggest creative solutions; where appropriate guiding us to “do it the right way.”
- Organize with end users, business analysts, and other architects and developers following a scrum methodology
- Develop and maintain new and existing applications for use by our Investment teams
- Collaborate standardizing development processes including technology selection, deployment steps, code reviews and IT tools
Primary responsibilities estimated percentage allocation
- Relationship Building: 20% requirements gathering and brainstorming with end users
- Heads Down Development: 80%
Our applications are primarily browser-based, developed using Python/Django and python libraries such as pandas, NumPy, etc., PL/SQL. Additionally, SQL Server, Elastic search, Redis, Kafka, Tableau, and a variety of third-party APIs and data sources come into play. We also have many applications written in C# such as Excel Add-In and some of the Market Data Loaders. We have more than 4 internal web portals that allow users to view and manage various types of internal MIO data (market data, research, trading data, Data API’s, Calculators etc.) – written in JavaScript and React.
Attributes of the successful candidate
The successful candidate would exhibit the following behaviors, values, and attributes:
- Driven by ownership - People with an ownership mindset don’t just complete tasks—they take full responsibility for outcomes. They step in to fix issues beyond their direct remit, foster collaboration, and push for excellence. They don’t point fingers; they analyze failures and work to prevent them. True owners proactively develop their skills and drive impact, ensuring the whole team succeeds.
- Obsessed with excellence - The best people set a high bar instinctively—they never settle for anything less than excellence. They deliver impact without over-engineering, take initiative where others hesitate, and build high-caliber networks to stay ahead. They spot overlooked issues, reframe obstacles into opportunities, and follow through relentlessly. When others stop, they find another way. Their drive isn’t about external validation but delivering exceptional results every time.
- Fueled by curiosity - The best people ask plenty of good questions—they challenge assumptions, seek deeper understanding, and explore beyond their domain. Their curiosity fuels continuous learning, helping them uncover insights others miss. They do not just grow themselves; they elevate those around them by sharing knowledge and pushing for better answers. For them, improvement is not a task—it’s a mindset.
- Problem-solving excellence - Exceptional problem solvers define problems clearly, breaking down complex challenges into manageable components using structured methodologies like issue trees and the MECE principle. They prioritize issues, develop testable hypotheses, and create detailed work plans with timelines. Their structured approach ensures they address root causes, not just symptoms. They move swiftly, with a strong bias for action, yet thoughtfully, balancing efficiency with thoroughness to deliver impactful solutions.
- Client service orientation - MIO’s ultimate clients are our investors; producing returns is our mission. Our IT team plays a critical role in enabling that mission by deeply understanding the needs of the investment team and other key functions. The best IT professionals do not just respond to requests—they put themselves in the business user’s shoes and truly grasp what drives decisions. They anticipate needs, develop high-impact solutions, and apply critical judgment, ensuring their work adds value while avoiding unnecessary complexity or cost. A successful IT person works tirelessly to understand and cater to their business needs.
Desired background
The preferred candidate will have strong experience writing n-tier front- and back-office applications and relatively sound knowledge in infrastructure related technologies (preferably for financial services companies, such as asset managers, hedge funds and/or broker/dealers). Candidates with strong technology qualifications outside of financial services will be considered.
- A bachelor’s degree in computer science or other related discipline (although strong experience with a less directly related degree will be considered)
- 2-4 years of experience in developing large-scale applications in a financial services / asset management organization
- Deep knowledge of at least 1 major asset class (instrument, market data, pricing etc.)
- Formal problem solving and/or analytical training/experience a plus
- Experience with front-end technologies like HTML, CSS, JavaScript, and frameworks such as Angular or React is required.
- Strong JavaScript (ES6+), React.js, and CSS-in-JS experience
- Experience with state management tools (Redux, MobX, Recoil, etc.)
- Solid understanding of web performance, responsive design, and accessibility
- Familiarity with modern tooling: Webpack, Babel, ESLint, etc.
- Experience with testing frameworks (Jest, Cypress, etc.)
- Experience with TypeScript is desired.
- Hands-on AWS development experience preferred
- Must be a proponent of the software development best practices including unit, functional and integration testing of their written code and good change management practice in a continuous integration environment.
- Experience with CI/CD pipelines and DevOps practices.
- Knowledge of microservices architecture.
- Exposure to Agile/Scrum methodologies.
- Experience profiling and optimizing code for performance
- Ability to write high performing SQL queries, procs, tables and views
- Experience with tools/frameworks such as Kafka, Redis, and elastic search
- Practical understanding of design patterns and a good intuition for system design
- Experience with migrating and supporting applications from on-premises infrastructure to Cloud a plus
Certain US states require MIO Partners, Inc. to include a reasonable estimate of the salary range for this role. Actual salaries may vary and may be above or below the range based on various factors, including, but not limited to an individual’s assigned office location, experience, and expertise. Certain roles are also eligible for bonuses, subject to MIO’s discretion and based on factors such as individual and/or organizational performance. Additionally, MIO offers a comprehensive benefits package, including medical, dental and vision coverage, telemedicine services, life, accident and disability insurance, parental leave and family planning benefits, caregiving resources, a generous retirement program, financial guidance, and paid time off.
MIO Partners, Inc. (MIO) is an equal opportunity employer. MIO will consider all applicants regardless of race, color, religion, sex, sexual orientation, gender identity, national origin, veteran status, or disability status.
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What We Do
MIO (and related entities) is an indirect, wholly-owned subsidiary of McKinsey & Company and was formed in the early 1980s to provide asset management services for McKinsey’s retirement plan. Over time, we have expanded to support after-tax investments by McKinsey’s current and former partners, primarily by making available funds already offered in the retirement plan. Our aim was to provide partners with convenient, time-saving investment options, including access to alternative investments.
Today, we are a company of approximately 250 people managing retirement and after-tax investments for roughly 30,000 current and former McKinsey employees. A key element of our operating model is that we operate at cost, generating no profit for either MIO or McKinsey. Our incentives are aligned with those of our investors due to significant management participation in the funds.
