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Sohayb Hassanhired · accepting offers
diff · policy listing
migrating…200equivalent
POLICY-LIST.cblCOBOL
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           PROCEDURE DIVISION.
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           0000-MAIN.
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               OPEN INPUT POLICY-FILE
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               PERFORM UNTIL WS-EOF = 'Y'
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                   READ POLICY-FILE
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                       AT END MOVE 'Y' TO WS-EOF
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                       NOT AT END PERFORM 1000-LIST
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                   END-READ
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               END-PERFORM
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               CLOSE POLICY-FILE
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               STOP RUN.
PolicyController.javaJava 17 · Spring Boot 3
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    @RestController
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    @RequestMapping("/policies")
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    class PolicyController {
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      private final PolicyRepository repo;
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      @GetMapping
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      List<PolicySummary> list(@RequestParam String holder) {
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        return repo.findByHolder(holder).stream()
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            .map(PolicySummary::from)
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            .toList();
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      }
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    }

2020: migrated a COBOL policy-listing system to Spring Boot. Now: LLM-assisted migration where the generated code is proven equivalent by differential execution — in progress.

23 lines
200OK— ms
content-type:
text/html; charset=utf-8
x-source:
content/en/profile.json
x-cv-version:
2026.09

Sohayb Hassan

Full-Stack Engineer · Java / Spring Boot · React · Banking & Financial Services

Full-stack engineer with six years at Capgemini building backend and web systems for banks, insurers and corporate clients. Currently delivers features end to end on a retail bank's mobile platform: Java 17 / Spring Boot 3 microservices, an OpenAPI-first BFF layer on JDK 21 and the React Native app. At home with the unglamorous side of banking integration (legacy hosts, BPM processes, multi-environment release pipelines) and with the tooling that keeps a large multi-repository programme moving. Started out migrating COBOL to Spring Boot; now spends personal time on LLM-assisted modernisation tooling where the output is verified, not trusted.

6 yrs
Capgemini · banking & financial services
3 layers
microservices · BFF · mobile app
COBOL → Java
legacy modernisation, hands-on

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