Application Modernization Services

Assessment, roadmap, and execution for legacy systems: what to retire, what to re-platform, and what to re-architect, with security engineered in during the rewrite.
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Definition

What is application modernization?

Application modernization is the work of rebuilding legacy systems so they stop constraining the business: moving applications onto supported platforms, re-architecting code that can no longer change safely, and retiring what nothing uses. BD Emerson runs legacy system modernization as an engineering program: an assessment that sorts the portfolio into retire, re-platform, and re-architect, a roadmap sequenced by business risk, and delivery teams that refactor, containerize, and move workloads without stopping operations. Security is engineered in during the rewrite, with identity, logging, and access control designed into the new architecture rather than bolted on after cutover. That order matters, because retrofitting controls onto a finished system costs more and covers less.

Services

What our application modernization services include

Legacy system assessment
Modernization roadmap
Refactoring and re-architecture
Containerization and re-platforming
Security engineered in
Legacy data migration

Legacy system assessment

We build a working inventory of applications, dependencies, and data flows, scored for business criticality, change failure risk, and run cost. Each system gets a disposition: retire, re-platform, re-architect, or leave alone, with the reasoning written down so the decision survives staff turnover.

Modernization roadmap

The roadmap sequences work by business risk rather than technical preference. Systems that block revenue or carry unsupported dependencies move first, quick wins fund the longer rebuilds, and every phase has named owners, estimated costs, and a rollback position.

Refactoring and re-architecture

We restructure code so it can change safely again: decomposing monoliths where the seams are real, cleaning up interfaces between systems, and rewriting components whose maintenance cost has passed their replacement cost. External behavior holds steady while the internals improve.

Containerization and re-platforming

We move applications onto supported runtimes and managed services: containerizing workloads, replacing end-of-life middleware, and shifting databases to managed equivalents. The result is a smaller operational surface that a normal team can run.

Security engineered in

Identity, secrets management, logging, and network segmentation are designed into the target architecture during the rewrite. Modernization is the cheapest moment to fix authentication debt and over-permissioned integrations, because the code is already open.

Legacy data migration

We handle schema mapping, data quality remediation, and reconciled cutovers for the data the legacy system holds. Row counts and control totals are checked before anyone turns the old system off, and the rollback plan stays live until they pass.

Our approach

Our approach

01

Assess before anything moves

The first two to four weeks build the inventory: applications, versions, dependencies, data flows, and run costs, with interviews of the people who operate the systems. The output is a scored portfolio and a disposition for every application.

02

Sequence by business risk

The roadmap orders work by what failure would cost the business. Revenue-blocking systems and unsupported dependencies come first, and each phase is sized so your team can absorb it while running normal operations.

03

Execute in phases

We refactor, containerize, and re-platform in increments that ship, each with functional and performance testing before cutover and a rollback path after it. Operations continue while the estate changes underneath.

04

Harden and hand over

Security controls are verified in the new architecture, monitoring and runbooks transfer to your team, and modernization KPIs are measured against the baseline from the assessment. The program ends with your engineers running the estate.

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Carrying systems that can no longer change?

Speak with BD Emerson about a legacy assessment, a roadmap sequenced by risk, and the first workload to move.

Our Advantage

Why BD Emerson for application modernization

Engineers who also run security

The team that rewrites the application also designs the identity, logging, and access model around it, so security review happens during the build instead of after it.

Sequenced by business risk

We order the roadmap by what an outage or a stalled change would cost you, and we put a tested rollback plan behind every cutover. Modernization should never become the incident.

One firm from assessment to cutover

The assessment ends in a priced backlog, and the same team executes it: refactoring, containerization, re-platforming, and the data migration behind them.

Reviews

What our customers say

Great consulting firms for scaling security, compliance, and appsec.

Outstanding partner in Technical and Cyber Due Diligence

Appsec maturity and application hardening.

BD Emerson helped us simplfiy our compliance management.

BD Emerson did such a phenomenal job. What started as privacy support quickly became a full partnership across compliance, engineering, and even business operations. They’re embedded with our team. They understand our product. They move fast. They’re simply invaluable.

Adam Ben Jacobs

CTO @ OneStep GPS

Great consulting firms for scaling security, compliance, and appsec.

Outstanding partner in Technical and Cyber Due Diligence

Appsec maturity and application hardening.

BD Emerson helped us simplfiy our compliance management.

BD Emerson did such a phenomenal job. What started as privacy support quickly became a full partnership across compliance, engineering, and even business operations. They’re embedded with our team. They understand our product. They move fast. They’re simply invaluable.

Adam Ben Jacobs

CTO @ OneStep GPS

We had a hard time finding the right company to partner with in support of our compliance journey. Some vendors sell the idea that they do the work, but then you end up doing everything. The ambiguity is what killed our last project. BD Emerson’s team has such great technical knowledge and understands the standard so well that they made us comfortable with moving fast. This has led to us closing major enterprise customers that were previously out of reach because of security and compliance.

Tom Watkins

CEO @ AMI AssetTrack

Lead an enterprise initiative to overhaul the organization's technology stack from ecommerce, corporate tech, and corporate security.

Supported ISO 42001 exercise and served as internal auditor.

Rubrik's privacy and compliance team began with the backbone of BD Emerson. BD Emerson supported building out the privacy program, GRC (ISO 27001, SOC 2, CMMC, FedRAMP), and the appsec function.

We needed a partner who could move quickly, without sacrificing precision. BD Emerson brought the expertise, structure, and speed we were looking for. Their team became an extension of ours, embedding themselves across the organization, guiding us step by step, and giving us confidence in areas we hadn’t tackled before. The internal audit they conducted was so detailed that even the external auditors called it out. Achieving ISO 27001 with zero nonconformities says everything you need to know about the quality of the partnership.

Walid Souilem

CTO @ FGI Worldwide

We had a hard time finding the right company to partner with in support of our compliance journey. Some vendors sell the idea that they do the work, but then you end up doing everything. The ambiguity is what killed our last project. BD Emerson’s team has such great technical knowledge and understands the standard so well that they made us comfortable with moving fast. This has led to us closing major enterprise customers that were previously out of reach because of security and compliance.

Tom Watkins

CEO @ AMI AssetTrack

Lead an enterprise initiative to overhaul the organization's technology stack from ecommerce, corporate tech, and corporate security.

Supported ISO 42001 exercise and served as internal auditor.

Rubrik's privacy and compliance team began with the backbone of BD Emerson. BD Emerson supported building out the privacy program, GRC (ISO 27001, SOC 2, CMMC, FedRAMP), and the appsec function.

We needed a partner who could move quickly, without sacrificing precision. BD Emerson brought the expertise, structure, and speed we were looking for. Their team became an extension of ours, embedding themselves across the organization, guiding us step by step, and giving us confidence in areas we hadn’t tackled before. The internal audit they conducted was so detailed that even the external auditors called it out. Achieving ISO 27001 with zero nonconformities says everything you need to know about the quality of the partnership.

Walid Souilem

CTO @ FGI Worldwide

BD Emerson didn’t just help us meet our compliance goals; they integrated security and privacy into the core of our operations. I highly recommend BD Emerson to anyone seeking SOC 2 or GDPR compliance, or simply looking to enhance their security team and boost customer trust in their product and services. Their dedication and expertise have been invaluable to our success.

Padraig Reilly

CEO, Boxcore

BD Emerson understood our business requirements and worked side-by-side with us. The policies and controls we developed together not only meet compliance standards but improve how we operate day to day.

Matt Meierdierks

IT Manager, Lincoln Industries

From day one, BD Emerson brought urgency, clarity, and a sharp understanding of what truly matters to our business — earning and keeping customer trust. They went beyond helping us meet compliance requirements; they helped build a foundation for secure, scalable growth. That kind of partnership is rare.

Jason Marker

CEO @ LifeLenz

BD Emerson didn’t just help us pass an audit—they helped us build a sustainable culture of security.

Alexey Indeev

CTO Spare

BD Emerson was essential in helping our company navigate the daunting process of leveling up our security infrastructure. BD Emerson’s impressive expertise and confidence throughout the process helped our team exceed HIPAA and SOC 2 Type 1 standards quickly, distilling what can be an overwhelming process into a streamlined, organized effort. From day one they began adding value and getting us on course. With their help we delivered on a massive security overhaul with both extreme efficiency and thorough attention to details. Because of BD Emerson’s support, we’ve increased our clients’ trust in Titan Intake and the life-changing work it accomplishes for those seeking specialist referrals.

Patrick Bruce

CEO, Titan Intake

BD Emerson didn’t just help us meet our compliance goals; they integrated security and privacy into the core of our operations. I highly recommend BD Emerson to anyone seeking SOC 2 or GDPR compliance, or simply looking to enhance their security team and boost customer trust in their product and services. Their dedication and expertise have been invaluable to our success.

Padraig Reilly

CEO, Boxcore

BD Emerson understood our business requirements and worked side-by-side with us. The policies and controls we developed together not only meet compliance standards but improve how we operate day to day.

Matt Meierdierks

IT Manager, Lincoln Industries

From day one, BD Emerson brought urgency, clarity, and a sharp understanding of what truly matters to our business — earning and keeping customer trust. They went beyond helping us meet compliance requirements; they helped build a foundation for secure, scalable growth. That kind of partnership is rare.

Jason Marker

CEO @ LifeLenz

BD Emerson didn’t just help us pass an audit—they helped us build a sustainable culture of security.

Alexey Indeev

CTO Spare

BD Emerson was essential in helping our company navigate the daunting process of leveling up our security infrastructure. BD Emerson’s impressive expertise and confidence throughout the process helped our team exceed HIPAA and SOC 2 Type 1 standards quickly, distilling what can be an overwhelming process into a streamlined, organized effort. From day one they began adding value and getting us on course. With their help we delivered on a massive security overhaul with both extreme efficiency and thorough attention to details. Because of BD Emerson’s support, we’ve increased our clients’ trust in Titan Intake and the life-changing work it accomplishes for those seeking specialist referrals.

Patrick Bruce

CEO, Titan Intake

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Our accreditations

At BD Emerson, we believe that our team's extensive certifications not only set us apart but also ensure that we provide the highest level of service to our clients.
FAQ

Frequently asked questions

What does application modernization actually involve?

How do you decide what to retire, re-platform, or re-architect?

How long does legacy system modernization take?

Can you modernize without stopping operations?

Where does security fit in a modernization program?

What does application modernization cost?

Do you handle the data migration too?

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