Tech jobs — page 145 · freehire

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Senior Backend / Data Developer

Open 15d RemoteEuropeFull-timeSenior

Senior Backend/Data Developer building backend solutions that work with diverse data sources — day-to-day work spans MongoDB, PostgreSQL, Virtuoso Triple Store and OpenSearch, including data modeling, query/performance optimization, and integrating backend services with data platforms. 100% remote B2B engagement via 1dea (Poland).

Agile MongoDB OpenSearch PostgreSQL

22K – 26K PLN / mo

Senior Backend Developer - Java / Kotlin / Microservices

Open 15d RemoteEuropeFull-timeSenior

Senior backend developer for an international client project via 1dea, building and maintaining scalable, API-driven microservices. Day-to-day work is 100% remote B2B with Java 17+, Kotlin, Spring Boot/WebFlux, Vert.x, Hibernate, and B2B integrations including AS4.

Agile API Hibernate Java Kotlin +1 skills

22K – 26K PLN / mo

Senior IAM Engineer - FedRAMP (Backend) | Hybrid NYC

Open 15d HybridNorth AmericaSenior

Senior backend engineer joining MongoDB Atlas's IAM team in New York (hybrid), designing and delivering core authentication and authorization components at global scale, mentoring teammates, with FedRAMP considerations for the cloud identity work.

Authentication Cloud Fedramp IAM MongoDB

Senior Backend Engineer, AI-Driven Cloud & APIs

Open 15d North AmericaSenior

Senior backend engineer at Moody's/PassFort who designs, builds, tests, and operates production-grade API-driven microservices and data pipelines supporting real-time and batch AI workloads. Owns features end-to-end, collaborates with product managers and data scientists, and ensures security and observability.

AI API Data Pipelines Microservices Observability

Alldus International Consulting Ltd

Senior Fintech Backend Engineer – Payments & Ledger Remote

Open 15d North AmericaSenior

Remote senior backend engineer for a San Francisco fintech: build and own the double-entry ledger that is the platform's financial system of record. Day to day you design money-movement infrastructure across ACH, instant payments, wires, cards and settlements, and develop scalable payout and reconciliation systems.

Senior AI-Native Backend Engineer (Remote, Flexible Hours)

Open 15d North AmericaSenior

Senior backend engineer at Vibehackers to lead backend and generative AI content pipelines for a newly funded edtech product — building an AI workflow engine and scalable Python/TypeScript infrastructure, with ownership of agentic coding, prompt/context engineering, system design, and API boundaries.

Agentic AI AI API Generative AI Python +1 skills

Better Tomorrow Ventures

Senior Backend Engineer - Fintech Payments & Banking

Open 15d North AmericaSenior

Senior backend engineer building the financial infrastructure behind private markets: owning ledger systems, bank and payment integrations, KYC, and secure PII storage with high correctness and auditability. Works in a startup-style San Francisco environment and guides product teams plus Compliance/Risk across the platform.

Senior Backend Engineer — Real-Time Logistics (Onsite NYC)

Open 15d North AmericaSenior

Senior backend engineer (hiring via Picnic, New York) who architects and scales real-time logistics and operations platforms, contributing to backend services behind web and mobile experiences alongside frontend, product, and operations teams. Core stack is Java and Go, with an emphasis on reliable, high-quality code.

Worldpay (UK) Limited

Senior Backend Engineer for AI-Driven Payments

Open 15d North AmericaSenior

Senior backend engineer on a greenfield 'Agentic Commerce' squad at payments company Worldpay, building secure, real-time payment infrastructure so AI agents, merchants, and risk systems can work together. Day to day: own API/SDK development, design cloud services on AWS or GCP, and ensure security, performance, and observability.

Agentic AI AI API AWS Cloud +2 skills

Senior Platform Backend Engineer for AI Agent Marketplace

Open 15d North AmericaSenior

Senior backend engineer at Socket.dev (on-site in Cupertino, CA) owning the services behind its AI agent marketplace and plugin ecosystem — building the catalog API, plugin hosting pipelines, and the trust model that keeps installs safe. Day to day: designing distributed backend systems, applying ML/data-engineering ideas, and partnering with security reviewers on uptime and production readiness.

API Data Engineering Machine Learning

Senior Python Backend Engineer - Remote, Scalable APIs

Open 15d RemoteAfricaSenior

Placements24 is hiring a Senior Backend Engineer to design, build, and scale Python backend services and APIs for a fully remote team. Day to day the role focuses on secure server-side development, database optimization, and contributing to system architecture.

Senior FinTech Backend Engineer — Remote & Growth

Open 15d AfricaSenior

Senior backend engineer on a FinTech team at Placements24, designing, developing, and deploying backend services that power financial applications in an agile environment. Core stack involves Java/Python/C#, cloud platforms, and microservices.

Agile Cloud C# Fintech Java +2 skills

Senior Backend Engineer - Python

Open 15d RemoteAfricaSenior

Fully remote senior backend role focused on designing, building, and scaling Python-based server-side services and APIs (Django/Flask), optimizing databases (SQL/NoSQL) and system architecture, and collaborating with cross-functional teams. Requires 5+ years of backend experience with a primary Python focus.

API Api Design AWS Azure Cloud +12 skills

Senior Backend Engineer - Blockchain

Open 15d AfricaSenior

Senior Backend Engineer building and scaling backend services and APIs for blockchain applications, on-site in Pretoria. Focus on distributed systems, integrating with blockchain protocols, nodes and wallets, and optimizing performance using languages like Go, Node.js, Python, or Java, plus cloud platforms and containerization.

API AWS Azure Blockchain Cloud +12 skills

Senior Backend Engineer

Open 15d HybridAfricaSenior

A Senior Backend Engineer will design, build, and maintain scalable server-side applications and RESTful APIs for the client's core products in Kimberley, South Africa, in a hybrid role. Day-to-day work centers on Python, Java, or Node.js services, SQL/NoSQL databases, performance optimization, code reviews, and mentoring junior engineers.

API AWS Azure Cloud Containerization +10 skills

Senior Elixir & Phoenix Backend Engineer

Open 15d AfricaSenior

Senior backend engineer at DockYard building user experience-focused web applications, working independently or alongside other engineers to deliver scalable solutions. Core stack is Elixir and Phoenix, with strong OTP usage, backend services, JSON APIs, and relational databases.

API Elixir JSON

Senior FinTech Backend Engineer (Hybrid, Sandton)

Open 15d HybridAfricaSenior

Design, develop, and deploy backend services and APIs for a fintech client in Sandton, using modern languages and cloud technologies to build scalable financial applications. You'll collaborate with product, design, and engineering, mentor juniors, and drive code quality and security in a hybrid model.

Senior Backend Engineer - Hybrid: Scalable APIs & Cloud

Open 15d HybridAfricaSenior

Senior Backend Engineer at Placements24 in Kimberley, South Africa, who designs, builds, and maintains scalable server-side applications and APIs for core products. Day to day involves performance optimization, SQL/NoSQL database work, mentoring juniors, and contributing to architecture in a hybrid setting.

Senior Backend Developer - Java / Kotlin / Microservices

Open 15d RemoteEuropeFull-timeSenior

1dea is hiring a Senior Backend Developer for an international client project on a 100% remote, long-term B2B contract from Poland. Day to day the person designs and builds distributed microservices with Java 17+, Kotlin, Spring Boot/WebFlux, Vert.x and Hibernate, with AS4/B2B integrations as a plus.

Agile API Hibernate Spring

130 – 155 PLN / hr

Backend Engineer | Mid - Senior | Go | Core Team

Open 93d HybridEuropeSenior H-1B sponsor history

Build and maintain scalable, secure Go (and/or PHP) microservices powering Nord Security's VPN core products like Threat Protection Pro and NordLynx. Day-to-day involves REST APIs, MySQL/Redis, RabbitMQ, and collaborating with QA, DevOps, and security teams, using Docker, Kubernetes, Grafana, and ElasticSearch.

AI API Cassandra Design Patterns DevOps +16 skills

4K – 7K € / mo