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Sr. C# / .NET Developer

SmartIMS Inc.

Hamilton, New York • Today

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Contract, Third Party

Depends on Experience

Principal or Lead C#/.NET Engineer | Applicant Must Be Currently Local to Hamilton, NJ | Relocation Not Allowed

V.L.S. Systems, Inc

Hybrid in Hamilton, New York • Today

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Contract

Depends on Experience

C#/.NET Engineer

ABAL Technologies Inc

Hybrid in Hamilton, New York • 20d ago

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Contract

52 - 54

Sr .NET technical lead

Global Alliant Inc

Remote • 10d ago

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Full-time

130000 - 140000

Stock Loan Senior Developer C#/.NET

ENXRA AI INC

Remote • Today

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Full-time

Depends on Experience

Certified Microsoft .NET web Developer IV

V-Soft Consulting Group, Inc

Remote • 3d ago

Easy Apply

Contract, Third Party

$63.38

Senior .NET Engineer Healthcare Platform (C#/.NET, Node.js/TypeScript, Azure/AWS)

NDAPARTNERS INC

Remote • Today

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Contract, Third Party

Depends on Experience

.NET/C# web developer - Local to CA

Visionsoft International

Remote • 9d ago

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Full-time

Depends on Experience

W2/1099 Role || Senior Dotnet Developer || Candidates must be CURRENT WI residents. No relocation is allowed

V.L.S. Systems, Inc

Remote • 4d ago

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Contract

Depends on Experience

Senior Software Engineer - .NET, C#, WPF

Motion Recruitment Partners, LLC

Remote • Today

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Full-time

$115000 - $130000

Sr. Web Application Developer

System One

Remote • Yesterday

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Contract

$57.65

Senior .NET Developer

ITCON Services

Remote or Hybrid in Vienna, Virginia • 23d ago

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Full-time

130,000 - 140,000

Senior .NET Full Stack Lead - US REMOTE

NTT DATA Americas, Inc

Remote • 16d ago

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Contract, Third Party

$66

Sr .Net Developer

Y & L Consulting Inc.

Remote • 30+d ago

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Full-time, Third Party

65 - 70

Senior .NET Developer

Infinite Computer Solutions (ICS)

Remote • 2d ago

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Full-time

Up to $115,000

TSD Application Developer - Lead (Senior/Specialist) | Two Positions

Washington State Department of Transportation

Remote or Lacey, Washington • Today

Full-time

USD 99,300.00 - 133,608.00 per year

Mid/Senior .NET Developer

Motion Recruitment Partners, LLC

Remote • Today

Easy Apply

Full-time

$110 - $130

Senior Backend .NET Developer

Agile Tech Labs

Remote • Today

Full-time

Senior Full Stack .NET Developer

Agile Tech Labs

Remote • Today

Full-time

Sr .NET Blazor Developer

Integral

Remote or Tysons, Virginia • Today

Full-time

USD 138,000.00 - 160,000.00 per year

Senior AWS Integration Developer

NTT DATA Americas, Inc

Remote • Today

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Contract, Third Party

$55 - $62

C#/Duck Creek Developer (Field Engineer)

Precision System Design Inc.

Remote or Hybrid • Today

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Contract

DOE

Senior Full Stack .NET Developer - California or Hawaii

AIMS

Remote or Hybrid in Sacramento, California • 3d ago

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Full-time

145000 - 160000

Senior Full Stack .NET Developer - California or Hawaii

AIMS

Remote or Hybrid in Honolulu, Hawaii • 3d ago

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Full-time

145000 - 160000

Senior .Net Full Stack Developer

Raas Infotek LLC

Remote • Yesterday

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Contract

Depends on Experience

Senior .NET Developer

SDH Systems

Remote or Colorado • Today

Contract

Senior .NET Web Developer (Certified) - $77 CTC - REMOTE (CURRENT WI Residents)

Chandra Technologies, Inc.

Remote • 6d ago

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Contract, Third Party

Depends on Experience

.Net Developer Remote (Within WI)

American Technology Consulting LLC

Remote • 3d ago

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Contract

Depends on Experience

.NET Developer (.Net & Azure)

Nasscomm, Inc.

Remote • 3d ago

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Contract

Depends on Experience

Senior Dot Net Developer with Azure

ITBMS Inc.

Remote • 14d ago

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Contract

40 - 50

Job Details

Skills

C#
.Net
Cobol
CI/CD
PostgreSQL
AWS

Summary

Title: Sr. .Net Developer

Location: Hamilton, NJ

Duration: 12+ Months

Description:

C# / .NET Engineering
Refactor machine-converted, COBOL-derived C# into idiomatic, maintainable .NET — meaningful naming, proper OO/domain design, separation of concerns, dependency injection

Work in .NET (Core) / .NET (latest version); apply modern C# language features (LINQ, async/await, records, pattern matching, nullable reference types, generics)
Design and implement service layers, domain models, and APIs (ASP.NET Core Web API) that back the Angular UI
Refactor legacy batch/procedural logic (converted from COBOL/JCL) into maintainable, testable .NET; handle exact decimal/financial arithmetic (decimal, rounding rules) to preserve benefit-calculation correctness
Optimize performance to meet the nightly batch window (profiling, memory management, async I/O, parallelism where safe)

Entity Framework / Data Layer

Own the data-access architecture using Entity Framework Core against PostgreSQL (Npgsql provider)
Refactor the auto-generated/converted data-access layer into a clean, performant EF Core model
Design entity models, DbContext configuration, Fluent API mappings, relationships, keys, and indexes reflecting the IDS-II → PostgreSQL schema (168 tables, 4,024+ fields)
Optimize EF Core queries (eager/lazy/explicit loading, projection, AsNoTracking, compiled queries, batching) to avoid N+1 and meet performance SLAs on high-volume batch operations
Manage EF Core migrations, concurrency handling, transactions, and connection resiliency
Map legacy data types and semantics correctly (packed decimals, fixed-width, EBCDIC-origin data, condition codes) to PostgreSQL/EF types without behavioral drift
Contribute to the COBOL-field → PostgreSQL-column → business-term data dictionary

Technical Leadership

Define and enforce C#/.NET coding standards, architecture patterns, and refactoring guidelines for the engineering team
Serve as senior technical authority on the converted codebase; make cross-cutting design decisions
Mentor mid/junior C# developers; perform code reviews; drive engineering quality

Partner with the Technical Manager/Architect on target architecture and the refactoring strategy

Quality, Testing & Delivery

Ensure functional equivalence: build unit and regression tests (xUnit/NUnit, Moq) to validate refactored code against the legacy baseline; fix FET-surfaced defects
Integrate with CI/CD (AWS CodeBuild/CodePipeline), enforce quality/security gates (SonarQube, static analysis, secure coding/OWASP)
Collaborate with FAMIS SMEs to preserve business logic (eligibility, benefit calculation, payments, EBT)
Deliver incrementally within Scrum; document design and decisions

Required Qualifications

15 years of professional C#/.NET software engineering, including senior/lead responsibilities
Deep expertise in C# and the .NET platform (.NET Framework and .NET Core / .NET 6/8+), including async programming, memory/performance optimization, and modern language features
Expert-level Entity Framework / EF Core: entity modeling, Fluent API, migrations, query optimization, transactions, concurrency, provider-specific behavior
Strong relational database skills; PostgreSQL strongly preferred (Oracle/SQL Server acceptable) — schema design, indexing, query tuning, stored procedures
ASP.NET Core Web API design (REST) for front-end integration
Solid software design: SOLID, design patterns, domain modeling, layered/clean architecture, dependency injection
Testing discipline: unit/integration/regression testing frameworks; TDD/mocking
Git, CI/CD, and static code analysis (SonarQube)
Proven ability to read, reason about, and safely refactor large, unfamiliar codebases
Exceptional attention to correctness — financial/benefit calculation accuracy

Legacy modernization experience — COBOL-to-C#/Java conversion, mainframe migration, or automated-transformation tooling
Understanding of mainframe concepts (COBOL, JCL, batch processing, hierarchical/CODASYL databases like IDS-II/IMS) — to reason about source behavior
High-volume batch processing performance tuning
AWS experience (ECS/EKS, Lambda, RDS for PostgreSQL, S3, CloudWatch, IaC/CloudFormation)
Experience integrating with enterprise job schedulers (Stonebranch, Control-M, CA7)
Government / benefits / healthcare or other regulated, high-correctness domains
Npgsql specifics, EF Core performance internals, or ORM migration experience

Establish the C#/.NET and EF Core standards, patterns, and reference implementation the team will follow
Refactor a representative set of converted programs (including a benefit-calculation and a batch program) to clean, tested, performant C# validated against the legacy baseline
Define the EF Core data-access approach against PostgreSQL, including query-performance guardrails for batch workloads
Mentor the team and set the code-review/quality bar
For a quick response please respond with resume and contact details to:

Employers have access to artificial intelligence language tools (“AI”) that help generate and enhance job descriptions and AI may have been used to create this description. The position description has been reviewed for accuracy and Dice believes it to correctly reflect the job opportunity.

Dice Id: SMARNJ
Position Id: csnetnj
Posted 3 hours ago

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Adithya Sastrulavari

Recruiter @ SmartIMS Inc.

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Hybrid in Hamilton, New York

•

Today

NOTE: APPLICANT MUST BE ON OUR W2 OR 1099. C2C IS ALLOWED IF OWN CORPORATION ONLY. NOT ACCEPTING SUB-VENDORS. APPLICANT MUST BE CURRENTLY LOCAL TO HAMILTON, NJ AT THE TIME OF SUBMISSION. RELOCATION IS NOT ALLOWED. Role: Principal or Lead C#/.NET Engineer Location: Hamilton, NJ Hybrid Duration: 12 Months Interview: In-Person Work Arrangement: Hybrid - Will start 100% on site for 30 days & move to hybrid 3 days onsite 2 days remote Short Description: Lead/Principal C#/.NET Engineer with expert

Easy Apply

Contract

Depends on Experience

C#/.NET Engineer

Hybrid in Hamilton, New York

•

20d ago

*Deep expertise in C# and the .NET platform (.NET Framework and .NET Core / .NET 6/8+), including async programming, memory/performance optimization, and modern language features *Expert-level Entity Framework / EF Core: entity modeling, Fluent API, migrations, query optimization, transactions, concurrency, provider-specific behavior We are modernizing a large, mission-critical Honeywell Bull mainframe benefits system (FAMIS) converting ~1.5M lines of COBOL and ~160K lines of JCL to C#/.NET, m

Easy Apply

Contract

52 - 54

Lead C#/.NET Engineer

New Jersey

•

Today

Sr/Lead C#/.NET Engineer Location: Hamilton, NJ (Hybrid) Position Type: Contract In Person Only Lead/Principal C#/.NET Engineer with expert-level Entity Framework Core experience to lead the modernization of a mission-critical legacy benefits system hosted on AWS Cloud. Position Summary: We are modernizing a large, mission-critical Honeywell Bull mainframe benefits system (FAMIS) converting ~1.5M lines of COBOL and ~160K lines of JCL to C#/.NET, migrating an IDS-II hierarchical database to Pos

Easy Apply

Full-time, Part-time, Third Party, Contract

C#/.NET Engineer

New Jersey

•

Today

C#/.NET Engineer Req number: R8573 Employment type: Full time Worksite flexibility: Hybrid Who we are CAI is a global services firm with over 9,000 associates worldwide and a yearly revenue of $1.3 billion+. We have over 40 years of excellence in uniting talent and technology to power the possible for our clients, colleagues, and communities. As a privately held company, we have the freedom and focus to do what is right-whatever it takes. Our tailor-made solutions create lasting results acro

Full-time

USD 58.00 - 62.00 per hour