Senior Software Engineer - Investments

Mercury; United States; On-site; USD 201,000 - 251,000; Full time

Job summary

Mercury is seeking a Senior Software Engineer for the Investments Team to lead and build scaled brokerage trading and custody systems powering our Treasury and Invest products. This hands-on role requires ownership, cross-functional collaboration, and a track record of delivering robust financial software in a fast‑growing fintech environment.

You will mentor engineers, shape architecture, and partner with product, operations, and compliance to ship thoughtful features for customers and internal

Qualifications

• 5–7+ years of backend experience with ownership and attention to detail.
• Domain knowledge of broker-dealer trading or custody systems.
• Experience with AWS and infrastructure solutions.
• Led complex projects with multiple stakeholders and outcomes.
• Ability to articulate technical opinions and tradeoffs clearly.

Responsibilities

• Lead high-impact, cross-functional projects across the Investments space.
• Architect, build, and scale brokerage trading and/or custody systems and processes.
• Collaborate with product, operations, and compliance to ship thoughtful features for our customers and internal users.
• Demonstrate strong product ownership and accountability – shape Mercury’s future.
• Join a team of engineers delivering scalable, compliant systems handling billions in assets.

Skills

Backend development

Broker‑dealer trading

Custody systems

AWS

Technical leadership

Architectural decisions

Job description

During the Renaissance in Florence, affluent merchants sought a way to protect their gold while ensuring it remained productive. The Medici family introduced a groundbreaking solution: by depositing assets with them, wealth remained secure and earned steady returns while staying liquid. This marked the birth of intelligent wealth management. Today, that same drive for financial ingenuity and innovation is reflected in the modern startup ecosystem.

Mercury captures this innovative spirit to provide an exceptional banking* experience for everyone. Our Investments Team develops innovative solutions for founders deciding how to utilize idle capital. We have built a financial platform that enables startups to deploy their cash effectively, merging maximizing yield with capital preservation in a streamlined interface. It is institutional-level cash management specifically designed for high-growth startups.

The Investments Team consists of backend and frontend engineers dedicated to crafting sophisticated products that oversee billions in customer assets as Mercury expands. We maintain a high standard of precision and excellence, recognizing that modern startups need solutions that surpass traditional expectations.

As a Senior Software Engineer on the Investments Team, you’ll play a key role as a technical leader and hands‑on engineer in building scaled, novel, and compliant Trading & Custody systems. These systems power our Treasury and Invest products and empower our internal Investment Operations team with robust and efficient tools. You will showcase a strong sense of ownership in a collaborative, cross‑functional environment while bringing the entire engineering team along with you as a leader.

As part of this role, you will:

• Lead high-impact, cross-functional projects across the Investments space.
• Architect, build, and scale brokerage trading and/or custody systems and processes.
• Collaborate with product, operations, and compliance to ship thoughtful features for our customers and internal users.
• Feel a strong sense of product ownership and actively seek responsibility – we want someone excited to help shape and build Mercury’s future.
• Join a team of engineers who do not take themselves seriously as we manage billions of dollars of customer assets.

The ideal candidate for the role:

• Has 5-7+ years of backend experience with a strong sense of ownership and detail.
• Domain knowledge of broker‑dealer trading and/or custody systems that support both individual securities (equities, fixed income) as well as ETFs and mutual funds.
• Understands scale and isn’t afraid to dig into AWS and infrastructure solutions.
• Has been the technical lead of complex projects with many stakeholders from inception to completion with a track record of success.
• Made architectural decisions measuring the impact of those decisions over time. You should be able to clearly articulate your technical opinions and lay out tradeoffs.

*Mercury is a fintech company, not an FDIC‑insured bank. Banking services provided through Choice Financial Group and Column N.A., Members FDIC.

Mercury values diversity & belonging and is proud to be an Equal Employment Opportunity employer. All individuals seeking employment at Mercury are considered without regard to race, color, religion, national origin, age, sex, marital status, ancestry, physical or mental disability, veteran status, gender identity, sexual orientation, or any other legally protected characteristic. We are committed to providing reasonable accommodations throughout the recruitment process for applicants with disabilities or special needs. If you need assistance, or an accommodation, please let your recruiter know once you are contacted about a role.

Total Rewards

The total rewards package at Mercury includes base salary, equity (stock options/RSUs), and benefits.

Our salary and equity ranges are highly competitive within the SaaS and fintech industry and are updated regularly using the most reliable compensation survey data for our industry. New hire offers are made based on a candidate’s experience, expertise, geographic location, and internal pay equity relative to peers.

Our target new hire base salary ranges for this role are the following:

US employees (any location):

$200,700—$250,900 USD

Canadian employees (any location):

$189,700—$237,100 CAD