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backend engineer

senior backend developer

Systems Limited

<div>Position: Senior Backend Developer (Python/FastAPI + Azure) 
Location: Pakistan

Summary

Python Developer at Systems Limited will be responsible to develop scalable, secure, and well-architected backend systems, and is comfortable working in a fast-paced, cloud-native environment. Strong understanding of architecture, system design and optimizations.
<div>
Responsibilities:</div>
<ul>
<li>Design, build, and maintain RESTful APIs and backend services using Python (FastAPI)</li>
<li>Architect and Implement authentication, session management, and authorization workflows using Azure Entra ID (formerly Azure AD)</li>
<li>Write clean, testable, and well-documented code following best practices</li>
<li>Ensure high availability, security, and performance of backend systems</li>
<li>Collaborate closely with frontend, DevOps, and QA teams</li>
<li>Use Git for source control and follow collaborative branching/review practices</li>
<li>Oversee code review, architecture design and performance tuning.</li>
<li>Derive adoption of best practices in code quality, CI/CD, monitoring and observability</li>
</ul>
<div>Requirements:</div>
<ul>
<li>6+ years of hands-on backend development experience</li>
<li>Proficiency with Python and FastAPI (or similar frameworks like Flask/Django REST)</li>
<li>Strong knowledge of Azure cloud services, especially:</li>
<li><ul><li>Azure Entra ID (OAuth2, SSO, JWT)</li>
<li>Azure SQL, Cosmos DB, Redis</li>
<li>Azure Web PubSub, App Services, and APIM</li>
</ul></li><li>Experience with Git, pull requests, and version control workflows</li>
<li>Strong understanding of secure coding principles and session handling</li>
<li>Experience building scalable and modular backend architectures</li>
<li>Excellent communication, leadership skills.</li></ul></div>

Senior Backend Developer

Launch Box

Senior Backend Developer &ndash; Join Our Growing Team!Location: Emarah Suites, Main Shahra-e-Faisal, Karachi Timings: 12:00 PM &ndash; 9:00 PM Employment Type: Full-time | On-siteAbout Us: We are a dynamic and fast-growing tech company dedicated to delivering high-quality, scalable, and innovative solutions for our global clients. We value creativity, problem-solving, and a passion for technology.Position Overview: We&rsquo;re looking for a Senior Backend Developer with strong expertise in Node.js and proficiency in multiple backend technologies. You will architect, develop, and maintain scalable APIs, databases, and backend systems, ensuring optimal performance and security.Key Responsibilities: Design, develop, and maintain robust backend systems and APIs, primarily using Node.js. Work with multiple backend languages and frameworks such as Python, PHP, Java, Go, or .NET when required. Collaborate with frontend developers, mobile engineers, and DevOps teams to deliver end-to-end solutions. Optimize applications for maximum speed, scalability, and security. Manage and maintain databases (SQL &amp; NoSQL) including PostgreSQL, MySQL, MongoDB. Implement best practices for code quality, testing, and deployment. Troubleshoot and debug applications, ensuring smooth performance. Mentor junior developers and lead code reviews.Requirements: 3+ years of backend development experience. Strong expertise in Node.js (Express.js, NestJS, or similar frameworks). Experience with RESTful APIs, GraphQL, and microservices architecture. Familiarity with cloud platforms (AWS, Azure, or GCP). Strong understanding of SQL &amp; NoSQL databases. Proficiency in other backend languages such as Python, PHP, Java, Go, or .NET. Knowledge of authentication, authorization, and security best practices (OAuth, JWT, etc.). Experience with Git and CI/CD pipelines. Strong problem-solving skills and attention to detail.Nice to Have: Experience with Docker, Kubernetes, and container orchestration. Knowledge of serverless architectures. Exposure to real-time systems (WebSockets, Socket.io).Job Type: Full-timeWork Location: In person

Senior Backend Developer (Node.js)

Sands Tech

Job Title: Mid-to-Senior Level Backend Node.js Developer (Mobile Apps)Location: Bahadurabad Karachi - on-site Job Type: Onsite - Full-time - 3pm to 12am ( Monday to Friday)About Us SANDS TECH is a fast-growing IT services company specializing in building innovative mobile applications. We are looking for a Mid-to-Senior Level Backend Node.js Developer to help us design and scale backend systems that power our mobile apps.What We Offer<ul><li>Competitive salary</li><li>Bi-annual increment</li><li>Medical reimbursement</li><li>Growth opportunities</li><li>Collaborative work environment</li></ul>Key Responsibilities<ul><li>Develop and maintain backend services in Node.js for mobile applications.</li><li>Build and optimize APIs for seamless app performance.</li><li>Work with databases (SQL/NoSQL) and third-party integrations.</li><li>Collaborate with mobile developers, QA, and DevOps teams.</li></ul>Requirements<ul><li>2&ndash;3 years of backend development experience with Node.js.</li><li>Strong knowledge of REST APIs, authentication, and data security.</li><li>Experience with mobile app integrations and push notifications.</li><li>Familiarity with Git, CI/CD, and cloud platforms.</li></ul>Apply now: muhammad.hamza@sandstech.org / hr@sandstech.orgJob Type: Full-timePay: Rs150,000.00 - Rs200,000.00 per monthWork Location: In person

Backend Node.js Developer - Mid level

Confiz

<div>We at Confiz are hiring an Principal Backend Engineer with strong expertise in backend technologies, system architecture, and performance optimization. Join our team to design and build scalable, secure, and high-performing backend systems that power exceptional digital experiences for global enterprises..
Responsibilities
<ul><li>Own microservices in NestJS (TypeScript): define module boundaries, version APIs, and ship resilient, well-tested services.</li>
<li>Design internal communication: implement REST/gRPC/event-driven patterns (e.g., request/response, pub/sub), handle retries, timeouts, backoff, and circuit breakers.</li>
<li>Implement secure JWT auth: access/refresh lifecycles, rotation, audience/issuer validation, revocation/blacklisting, and token storage best practices.</li>
<li>Deliver payment integrations: integrate with gateways (e.g., Stripe/Adyen/Braintree), implement idempotent operations, handle captures/refunds/disputes, and reconcile via signed webhooks.</li>
<li>Build and consume webhooks: define payload contracts, verify signatures/HMAC, ensure idempotency, and implement robust retry and DLQ strategies.</li>
<li>Enable real-time features with WebSockets: use NestJS Gateways/Socket.IO or ws for presence, notifications, and fan-out at scale; secure and rate-limit connections.</li>
<li>Use Redis/Valkey effectively: design cache keys/TTLs, apply cache-aside/write-through, implement distributed locks, queues/streams, pub/sub, and mitigate hot keys.</li>
<li>Containerize and run locally: craft efficient multi-stage Docker builds, add healthchecks, and orchestrate multi-service dev stacks with docker-compose.</li>
<li>Quality &amp; reliability: write unit/integration/e2e tests (Jest/Supertest), add schema validation (class-validator/OpenAPI), and instrument with logs/metrics/traces.</li>
<li>Collaborate across teams: review PRs, write concise design docs, and partner with product, frontend, and data to deliver measurable outcomes.</li>
</ul>
Requirements
<ul><li>5+ years building backend systems; 5+ years NestJS + TypeScript in production.</li>
<li>Strong Docker and docker-compose skills (multi-stage builds, image slimming, healthchecks).</li>
<li>Solid microservice design: domain boundaries, API versioning, idempotency, saga/choreography, and eventual consistency (outbox/inbox).</li>
<li>Hands-on JWT implementation in distributed systems.</li>
<li>Demonstrated payment experience (idempotency keys, reconciliation jobs) and webhooks (HMAC/signatures, replay protection, retries).</li>
<li>Built and scaled WebSockets features in production.</li>
<li>Proficiency with Redis/Valkey for caching and real-time patterns; strong SQL fundamentals (PostgreSQL/MySQL) and practical ORM experience (TypeORM/Prisma).</li>
<li>Testing mindset with meaningful coverage and CI checks; working knowledge of security best practices (OWASP, secrets management, least privilege).</li>
<li>Comfortable with telemetry (structured logs, metrics, tracing) and on-call ownership.</li>
<li>Kong Gateway (or similar API gateway) for routing, auth, rate limiting, and observability.</li>
<li>Kubernetes/Helm; service meshes (Istio/Linkerd).</li>
<li>Event platforms (NATS/Kafka/RabbitMQ) and streaming patterns.</li>
<li>GraphQL (Apollo/NestJS) including subscriptions.</li></ul> 

We have an amazing team of 700+ individuals working on highly innovative enterprise projects &amp; products. Our customer base includes Fortune 100 retail and CPG companies, leading store chains, fast-growth fintech, and multiple Silicon Valley startups.
What makes Confiz stand out is our focus on processes and culture. Confiz is ISO 9001:2015 (QMS), ISO 27001:2022 (ISMS), ISO 20000-1:2018 (ITSM), ISO 14001:2015 (EMS), ISO 45001:2018 (OHSMS) Certified. We have a vibrant culture of learning via collaboration and making workplace fun.
People who work with us work with cutting-edge technologies while contributing success to the company as well as to themselves.
To know more about Confiz Limited, visit: https://www.linkedin.com/company/confiz-pakistan/</div>

Principal Backend Engineer (NestJS / TypeScript / Microservices)

Conure Information Technology Services

We&rsquo;re Hiring: Senior Technical Lead / Senior Full Stack DeveloperLocation: Karachi / Hybrid Type: Full-time Experience Level: Senior 8 years + ExperienceRole overviewWe are seeking an experienced Senior Technical Lead / Senior Full Stack Developer to own technical architecture, lead implementation, and manage a small cross-functional engineering team. This is a hands-on leadership role covering backend, mobile/web frontends, integrations, DB design, security, and the delivery pipeline.Key responsibilities<ul><li>Architect, build, and maintain scalable software systems (frontend, backend, DB, integrations).</li><li>Lead, mentor, and manage a multi-skilled development team.</li><li>Design and implement secure, reliable APIs and backend services.</li><li>Oversee mobile and web app development and ensure consistent UX implementation.</li><li>Integrate and manage third-party services (payment gateways, identity/KYC providers, notification providers, etc.).</li><li>Implement and manage payment transaction flows, webhooks, and reconciliation logic.</li><li>Ensure security, privacy, and compliance best practices (data protection, secure storage, tokenization).</li><li>Establish CI/CD pipelines, infrastructure-as-code, deployments, and monitoring.</li><li>Document system architecture, APIs, and operational runbooks.</li><li>Collaborate with stakeholders to translate requirements into technical plans and delivery timelines.</li></ul>Required technical skills &amp; experience<ul><li>8+ years in full-stack development with demonstrable leadership of small teams.</li><li>Backend: Node.js (Express/NestJS) or Python (Django / FastAPI) &mdash; strong API design skills.</li><li>Frontend / Mobile: React, React Native, or Flutter &mdash; practical experience shipping mobile applications.</li><li>Databases: PostgreSQL / MySQL and experience with a NoSQL option (MongoDB / Firebase).</li><li>Cloud &amp; DevOps: AWS / GCP / DigitalOcean; Docker; CI/CD (GitHub Actions, Jenkins, GitLab CI or equivalent).</li><li>Security: API security, tokenization, TLS, secure key management, and general system hardening.</li><li>Payments / FinTech: Direct, hands-on experience integrating payment gateways (e.g., Stripe, Braintree, Adyen, PayPal, or regional gateways). Experience implementing Payment Intents, tokenization, webhooks, refunds, dispute handling, and multi-party (marketplace) flows (e.g., Stripe Connect) is required.</li><li>Experience with third-party identity/KYC providers (e.g., Onfido, Trulioo, Jumio) and handling KYC workflows is highly desirable.</li><li>Strong proficiency with version control (Git) and engineering best practices (code review, testing, release management).</li></ul>Preferred / nice-to-have<ul><li>Prior experience in FinTech, payments, or marketplace platforms.</li><li>Familiarity with PCI-DSS implications and secure card-data handling patterns (even if using hosted/tokenized flows).</li><li>Experience with event-driven systems, message queues (Kafka, RabbitMQ), or serverless architectures.</li><li>UI/UX tooling familiarity (Figma, Adobe XD) and ability to guide implementation fidelity.</li><li>Prior startup / early product-stage experience (MVP to production).</li></ul>Soft skills<ul><li>Strong ownership, communication, and stakeholder management.</li><li>Comfortable making architectural trade-offs in an early-stage product environment.</li><li>Mentoring and growing a small technical team; hands-on with code and reviews.</li></ul>What we offer<ul><li>Leadership role with meaningful technical ownership.</li><li>Flexible hybrid work and competitive compensation.</li><li>Opportunity to build and manage a focused engineering team.</li></ul>How to applyEmail your resume / LinkedIn / GitHub and a short note describing your payments/gateway integration experience and any relevant projects to afshan.iqbal@conurets.comJob Type: Full-time

Senior Technical Lead/Senor Full Stack Developer

ZIP24

Job Title: Java Spring Boot DeveloperExperience: 1&ndash;2 yearsLocation: HybridDepartment: Engineering EmploymentType: Full-timeAbout the RoleWe are looking for a Junior Java Spring Boot Developer to join our backend engineering team. The ideal candidate has hands-on experience with Java, Spring Boot, REST APIs, relational databases, and is comfortable working in a fast-paced, product-driven environment.Key Responsibilities:<ul><li>Develop and maintain backend services and APIs using Java and Spring Boot.</li></ul><ul><li>Write clean, maintainable, and testable code following best practices.</li></ul><ul><li>Work with relational databases such as PostgreSQL or MySQL (queries, schema updates, indexing basics).</li></ul><ul><li>Debug issues, optimize performance, and assist in improving existing systems.</li></ul><ul><li>Collaborate with product, QA, DevOps, and senior engineers to deliver features on time.</li></ul><ul><li>Assist in integrating third-party APIs and message queues (RabbitMQ, Kafka, etc., optional).</li></ul>Required Skills &amp; Qualifications <ul><li>1&ndash;2 years of professional hands-on experience with Java and Spring Boot.</li></ul><ul><li>Strong understanding of REST API development.</li></ul><ul><li>Basic experience with SQL and relational database concepts.</li></ul><ul><li>Familiarity with Git and common branching strategies.</li></ul>Good to Have (Optional): <ul><li>Experience with Docker, Kubernetes, or containerized environments.</li></ul><ul><li>Exposure to message brokers like RabbitMQ, Redis.</li></ul>To Apply: Send your resume to neha.faisal@zip24.com or career@zip24.comJob Type: Full-timePay: Rs80.00 - Rs100,000.00 per monthWork Location: In person

Java Spring Boot Developer

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