Senior .NET/C# Developer (Oracle to PostgreSQL migration)

Salt Digital Recruitment; Greater London; Remote; GBP 60,000 - 80,000; Full time

Job summary

A leading company in finance is seeking a Senior .NET/C# Developer for a strategic 6-month project migrating from Oracle to PostgreSQL. This role involves re-engineering complex legacy code to enhance system architecture, ensuring seamless integration for business continuity.

Qualifications

• 5+ years of experience in .NET/C# development.
• Strong understanding of PL/SQL and legacy system migration.
• Familiarity with PostgreSQL performance tuning.

Responsibilities

• Re-engineer Oracle PL/SQL stored procedures into C# services.
• Design and implement .NET components integrating with legacy PHP and PostgreSQL.
• Support BAU operations to ensure system stability during migration.

Skills

C#

.NET

PL/SQL

PostgreSQL

AI tools

Software architecture

Integration strategies

Job description

Senior .NET/C# Developer (Oracle to PostgreSQL migration) – Finance – Remote

Duration: 6 months

Rate: £500 – £600

Start: ASAP

My client is looking for a Senior Developer to join the team to help with a migration. They are undertaking a strategic transformation of a legacy system built on PHP and Oracle, migrating to a modern architecture using PostgreSQL and .NET (C#). This is not a simple lift-and-shift; the project involves re-engineering over 240 Oracle stored procedures, some highly complex, into performant, maintainable C# code. The new system will coexist with the legacy platform during the transition, requiring careful integration and support for business-as-usual (BAU) operations.

Key Responsibilities

• Collaborate with the existing team to re-engineer Oracle PL/SQL stored procedures into C# services.
• Design and implement .NET-based components that integrate with both legacy PHP systems and new PostgreSQL databases.
• Work closely with business analysts and stakeholders to ensure functional parity and identify opportunities for enhancement.
• Participate in the design of a hybrid architecture that supports phased migration.
• Use AI-assisted tools to analyse, translate, and optimize legacy code.
• Support BAU operations during the migration period, ensuring system stability and continuity.
• Contribute to code reviews, testing strategies, and documentation.

Required Skills & Experience

• 5+ years of experience in .NET/C# development, with a strong focus on backend services and data access layers.
• Proven experience in migrating legacy systems, especially from Oracle to PostgreSQL or similar.
• Strong understanding of PL/SQL and experience translating stored procedures into application logic.
• Familiarity with PostgreSQL, including performance tuning and SQL dialect differences.
• Experience working in hybrid environments where legacy and modern systems coexist.
• Comfortable using AI tools (e.g., GitHub Copilot, ChatGPT, code translators) to assist in development and migration tasks.
• Solid understanding of software architecture, design patterns, and integration strategies.
• Excellent communication skills and ability to work collaboratively in a cross-functional team.

Desirable Skills

• Experience with PHP, especially in legacy systems.
• Familiarity with DevOps practices, CI/CD pipelines, and containerization (Docker/Kubernetes).
• Exposure to domain-driven design and microservices architecture.
• Experience in agile development environments.

*Rates depend on experience and client requirements

Job Information

Job Reference: JO-2507-354873

Salary: £500 - £600 per day

Salary per: day

Job Duration: 6 months

Job Start Date: ASAP

Job Industries: Software Engineering

Job Locations: Greater London

Job Types: Contract

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