Senior Full-Stack Software Engineer - Banking Platforms

Senior Full-Stack Software Engineer

Banking Platforms & AI Modernization

About Us

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Instantiations is a leader in custom software solutions, serving clients from the largest global enterprises to innovative small businesses. At the core of our success is a cohesive team of talented developers and forward-thinking leadership, working together to tackle complex challenges with creativity and collaboration.

We pride ourselves on fostering a culture of mutual respect, innovation, and continuous growth, where team members genuinely look forward to contributing and thriving. With a 100% remote work setup, we offer the flexibility to work from almost anywhere within the United States while being part of a close-knit, supportive community that values your expertise and individuality.

About the Role

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We are selectively seeking one highly skilled, senior-level full-stack software engineer to join our fintech business unit supporting banking customers across North America. This is a hands-on role spanning the full software development lifecycle — design, development, implementation, modernization, maintenance, production support, and customer-facing technical collaboration.

Employment Requirements

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Because we serve banking customers in a regulated environment, a few things are non-negotiable:

• You must reside in the United States and not require visa sponsorship now or in the future
• You must communicate in clear, fluent English — reading, writing, and speaking — to work effectively with clients, teammates, and stakeholders
• You must be able to pass a clear background verification
• Work and customer support must be performed while physically located in the United States
• Willingness to serve in the on-call rotation

Work Experience Requirements

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• 7+ years of software development experience with a strong focus on Smalltalk and/or Java programming
• 7+ years in a senior full-stack software engineer role
• Prior direct customer experience, problem solving with the customer
• Bachelor’s degree in computer science or equivalent field, preferred
• Experience in banking, financial technology, insurance, healthcare, or other regulated industries is a strong plus
• Excellent problem-solving skills and the ability to work independently in a remote environment
• Strong understanding of software development life cycles, agile methodologies, and remote collaboration tools
• Strong and effective communication skills, with the ability to articulate complex technical concepts to non-technical stakeholders
• Possess a deep commitment to positive customer outcomes
• Leadership qualities, including the ability to mentor junior team members and lead by example

Technology Skill Requirements

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Smalltalk, a purely object-oriented programming language, powers a core part of our banking platform. Strong object-oriented development is at the heart of this role.

* The ideal candidate is a VAST Platform (VA Smalltalk) and Java expert * We would be open to a very strong Java expert who possesses the highly desired skills (listed below) and who is genuinely excited to learn the VAST Platform + We would be willing to support a small ramp up for a highly skilled Java expert who is also deeply skilled in the other technology stacks listed below

Highly desired skills and practical experience in the following

* Experience with the VAST Platform * Enterprise AI engineering * Databases: DB2, SQL Server, Oracle, or PostgreSQL * CI/CD, DevOps, and related tooling (Git, Docker, Kubernetes, Azure DevOps, etc.) * Middleware: + Engineer and harden enterprise runtimes (IBM WebSphere, Tomcat) and messaging fabrics (IBM MQ, MQTT), implementing zero-trust security (mTLS, OAuth2, WS-Security) across all RESTful and SOAP interfaces. * Python scripting and automation

What You’ll Do

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• Design, develop, enhance, maintain, and support software across multiple application stacks
• Work across the full SDLC: requirements, design, coding, testing, implementation, support, and ongoing improvement
• Support client implementation activities, production issue analysis, and customer-facing technical discussions
• Contribute to modernization initiatives and AI-enabled capabilities integrated into banking platforms
• Participate in 24/7 production support on a reasonable on-call rotation schedule (stipend paid for on-call)

AI Engineering

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AI engineering is a core part of this role — not prototypes, but practical, enterprise-grade solutions. Experience with agentic systems, retrieval-augmented architectures, AI evaluation, security considerations, and integration with existing business platforms is highly valued.

Who Thrives Here

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Our team is tight-knit and genuinely supportive of one another. The engineers who do best here are self-directed and accountable, but they never have to go at it alone. You’ll fit right in if you:

• Have strong object-oriented fundamentals, especially in VA Smalltalk or Java
• Are comfortable working across both legacy and modern systems
• Communicate clearly with technical and non-technical audiences
• Take ownership while also being a collaborative teammate
• Care about reliability, security, and customer trust

Work Location

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Fully remote. The role generally aligns with Central Time business hours. Travel is minimal, expected to be under 10%.

Compensation

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While we are looking for one person, we know that person can be at a mid-level or a senior level. Expected salary range starting at $110,000 - $150,000 depending on skill level and experience. Separate allowance for on-call pay.

Instantiations’ Benefits

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We offer a generous and comprehensive package to our full-time employees.

• Flexible Vacation (employees are encouraged to take at least three weeks per year)
• Paid Sick Leave
• Paid Family Leave
• 15 Paid Holidays
• Medical, Dental, and Vision coverage starting on your first day, 100% covered for you and your family
• HSA Plan with employer contributions (if you choose an HSA-eligible medical plan)
• Group Life Insurance – 2X your salary (company paid)
• Short-Term and Long-Term Disability Insurance (company paid)
• 401(k) Plan, with up to a 4% employer match
• Employee Assistance Program (EAP) (company paid)

*It is the policy of Instantiations to not discriminate against any applicant for employment, or any employee because of age, color, sex, disability, national origin, race, religion, or veteran status.*