Senior C Developer

Job Description

As a Senior C Developer at Endava, you will be a hands-on engineer on a large-scale datacenter migration, moving a long-lived payments platform from UNIX/AIX to Linux (RedHat) with applications refactored for the cloud (AWS). You will own the analysis, refactoring, and consolidation of C applications, relying on strong systems fundamentals to reason about behaviour and deliver with autonomy. Beyond the migration, you will have the opportunity to grow into long-term BAU, project, and client-integration work on the same platform.

Responsibilities:

- Designs, estimates, and implements technical solutions for medium/high complexity applications.

- Participates actively in all phases of application development lifecycle.

- Collaborates with various project stakeholders to provide support for clarifying requirements, processes, architecture, and priorities.

- Recommends and promotes IT industry standards, tools, practices (DevOps, etc.) to achieve well-engineered software products.

- Proposes improvements and escalates risks/issues related to development activities.

- Participates in the review of the work done by development team members.

- Learns and applies new technologies, practices, and tools as appropriate to the project.

- Shares experience and knowledge gained from projects.

- Has responsibility for the work of others and for allocating resources.

- Influences the team, customers, and suppliers.

- Makes decisions which influence the success of projects and team objectives.

- Can propose and design solutions autonomously.

- Can articulate solutions to technical and non-technical stakeholders.

Qualifications

Required:

- 5+ years of hands-on software development experience, with strong, demonstrable expertise in plain C.

- Strong UNIX experience across AIX and Linux (RedHat), with proven ability to port and refactor applications from AIX to Linux RedHat.

- Shell scripting (Korn/ksh, Bash) for build, run, and deployment tasks across UNIX environments.

- Solid command of the C build and debug toolchain — Make/Makefiles, gcc, gdb, and core-dump analysis.

- Experience refactoring and consolidating applications, including redesign work as part of a migration.

- A self-directed developer mindset, comfortable delivering with autonomy and taking ownership end to end.

- Good communication skills, able to articulate solutions to technical and non-technical stakeholders.

Nice to have:

- SQL and relational databases (DB2, Oracle), including embedded SQL (Pro*C / ESQL/C) as used in C applications.

- Sockets, TCP/IP, and inter-process communication (IPC) for application integrations and messaging.

- Cross-platform portingawareness — endianness, data-type sizes, and compiler differences between AIX (POWER) and Linux (x86).

- Payments / financial transaction processing domain knowledge (e.g. ISO 8583, card and transaction switching, PCI DSS).

- Git/GitHub — the project is migrating source control from SCCS to GitHub.

- Exposure to Harness or a comparable enterprise CI/CD tool (similar in role to Jenkins).

- Familiarity with AWS, as the migrated applications will run in the cloud (databases hosted in a payments datacenter).

- Exposure to Linux administration, Docker/containerisation, or Terraform/IaC on the cloud target.

- Experience integrating with external clients and third-party systems.

Additional Information

Discover some of the global benefits that empower our people to become the best version of themselves:

• Career Development: Career coaching, global career opportunities, non-linear career paths, internal development programmes for management and technical leadership;
• Learning Opportunities: Complex projects, rotations, internal tech communities, training, certifications, coaching, online learning platforms subscriptions, pass-it-on sessions, workshops, conferences;
• Health: Global internal wellbeing programme, access to wellbeing apps;
• Community: Global internal tech communities, hobby clubs and interest groups, inclusion and diversity programmes, events and celebrations.

At Endava, we’re committed to creating an open, inclusive, and respectful environment where everyone feels safe, valued, and empowered to be their best. We welcome applications from people of all backgrounds, experiences, and perspectives—because we know that inclusive teams help us deliver smarter, more innovative solutions for our customers. Hiring decisions are based on merit, skills, qualifications, and potential. If you need adjustments or support during the recruitment process, please let us know.